iOS小技巧总结

# Masonry 显示fream

// 先调用superView的layoutIfNeeded方法再获取frame

[self.view layoutIfNeeded];

# 苹果开发者账号，支付失败问题解决开户行手机号公司邮箱开户行地址

CocoPods的错误

cocopodes 使用

1.使用CocoaPods

打开终端，使用cd命令定位到需要使用CocoaPods的项目根路径。如：

cd+空格然后把文件拖进命令行

2.然后在通过search命令来查找库的信息，如需要加入JSONKit，那可以如下写法：

pod search AFNetworking

3.得到必要的库信息后，现在需要在项目中建立Podfile文件。通过下面的命令：

touch Podfile

然后编辑Podfile文件，命令如下：

open -e Podfile

在弹出的编辑界面中输入下面内容：

platform :ios pod

然后调用下面命令来进行初始化：

pod install

如果Podfile中添加了新库，可以使用下面命令进行更新：

pod update

# Git

首先下载创建的git

cd 文件目录

1.git add . (添加所有修改)

2.git status

3.git commit -m '修改的内容'

4.git push origin master

# Uncomment this line to define a global platform for your project

# unrecognized selector sent to class 阿里云上传问题

$(SRCROOT)/Haoqinsheng02/UIFrames/Vendors/aliyunOSS/AliyunOSSiOS.framework/AliyunOSSiOS -force_load

-ObjC

这个flag告诉链接器把库中定义的Objective-C类和Category类都加载进来。但是如果静态库中有类和category的话只有加入这个flag才行。

-all_load

用了-ObjC以后，如果类库中只有category没有Objective-C类的时候这些category还是加载不进来。变通方法就是加入-all_load或者-force-load。-all_load会强制链接器把目标文件都加载进来，即使没有objc代码

-force_load

这个flag所做的事情跟-all_load其实是一样的，只是-force_load需要指定要进行全部加载的库文件的路径，这样的话，你就只是完全加载了一个库文件，不影响其余库文件的按需加载

# CocoPods的应用

$ touch Podfile

platform :ios, '9.0'

use_frameworks!

target '工程名称' do

pod 'MJRefresh'

pod 'MBProgressHUD'

pod 'Masonry'

end

3.$ pod install

4.$ pod update

platform :ios, '9.0'

use_frameworks!

target '你的工程的名字' do

pod 'MJRefresh'

pod 'MBProgressHUD'

pod 'Masonry'

end

\

# 隐藏导航栏

-(void)viewWillAppear:(BOOL)animated {

[super viewWillAppear:animated];

[self.navigationController setNavigationBarHidden:YES animated:YES];

}

# 隐藏底部状态栏

-(void)viewWillDisappear:(BOOL)animated {

[super viewWillDisappear:animated];

[self.navigationController setNavigationBarHidden:NO animated:YES];

}

# 2.Masonry 使用

MasonyBtn = [UIButton buttonWithType:UIButtonTypeRoundedRect];

[self.view addSubview:btn];

必须先添加到父控件内再进行约束

[MasonyBtn mas_makeConstraints:^(MASConstraintMaker *make) {

make.top.equalTo(backView.mas_bottom).offset(30);

make.left.mas_equalTo(backView.mas_left).mas_offset(10);

make.height.mas_equalTo(30);

make.right.equalTo(backView.mas_right).mas_offset(-10);

}];

# 3. AFNetworking进行网络请求，多任务异步请求

我们知道使用AFNetworking进行网络请求，都是异步的，有时候我们需要等若干个无序的（2个或者更多个）异步请求都成功后再执行某些代码，当遇到这种需求的时候，最简单的做法，或者说我们一般会采用的做法是，将一个异步请求嵌套在另一个异步请求中，就是在第一个请求成功返回后再调用第2个异步请求，这种做法其实是不太好的，既浪费了时间

#如何使用dispatch group来实现上述场景中的需求

1.创建dispatch_group_t

```objc

dispatch_group_t group = dispatch_group_create();

```

2.使用dispatch_group_enter进入group，表示任务开始

```objc

dispatch_group_enter(group);

```

3.使用dispatch_group_leave退出group，表示任务完成

```objc

dispatch_group_leave(group);

```

4.使用dispatch_group_notify注册group里所有任务完成后的回调block

```objc

dispatch_group_notify(group, dispatch_get_main_queue(), ^{

});

```

注：与dispatch_group_notify对应的还有一个叫dispatch_group_wait的东西，这2者的区别是：

dispatch_group_notify：是异步的，不阻塞当前线程

dispatch_group_wait：会阻塞当前线程，直到dispatch group中所有任务都完成才返回

完整的调用代码：

-(void)groupSync

{

dispatch_group_t group = dispatch_group_create();

dispatch_group_enter(group);

dispatch_async(dispatch_get_global_queue(0, 0), ^{

sleep(5);

NSLog(@"任务一完成");

dispatch_group_leave(group);

});

dispatch_group_enter(group);

dispatch_async(dispatch_get_global_queue(0, 0), ^{

sleep(8);

NSLog(@"任务二完成");

dispatch_group_leave(group);

});

dispatch_group_notify(group, dispatch_get_global_queue(0, 0), ^{

NSLog(@"任务完成");

});

}

# 异步执行代码

//1.获得全局的并发队列

dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);

//2.添加任务到队列中，就可以执行任务

//异步函数：具备开启新线程的能力

dispatch_async(queue, ^{

NSLog(@"下载图片1----%@",[NSThread currentThread]);

});

dispatch_async(queue, ^{

NSLog(@"下载图片2----%@",[NSThread currentThread]);

});

dispatch_async(queue, ^{

NSLog(@"下载图片2----%@",[NSThread currentThread]);

});

//打印主线程

NSLog(@"主线程----%@",[NSThread mainThread]);

# 获取图片尺寸

-(UIImage *)rescaleImageToSize:(CGSize)size {

CGRect rect = CGRectMake(0.0, 0.0, size.width, size.height);

UIGraphicsBeginImageContext(rect.size);

[self drawInRect:rect]; // scales image to rect

UIImage *resImage = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

return resImage;

}

# 3.通知获取

[[NSNotificationCenter defaultCenter] addObserver:self

selector:@selector(handleNotification:)

name:SVProgressHUDWillAppearNotification

object:nil];

# 4.UItableviewcell取消选中

self.selectionStyle=UITableViewCellSelectionStyleNone;

# 5设置tableViewCell间的分割线的颜色

[TableView setSeparatorColor:[UIColor xxxx ]];

设置_tableView数据比较少的时候，下面显示的是白色

[self setExtraCellLineHidden:_tableView];

-(void)setExtraCellLineHidden: (UITableView *)tableView

{

UIView *viewback = [UIView new];

viewback.backgroundColor = [UIColor clearColor];

[_myTableview setTableFooterView:viewback];

}

# 6 从nib中加载cell

[self.regittableview registerNib:[UINib nibWithNibName:@"RegisterCell" bundle:nil] forCellReuseIdentifier:@"register"];

tableView cell选中颜色

cell内部设置

[self setBackgroundColor:[UIColor redColor]];

self.selectedBackgroundView = [[UIView alloc] initWithFrame:self.frame];

self.selectedBackgroundView.backgroundColor =UIColorFromRGB(0xFFEAEA);

# 7.iOS开发之下拉崩溃"index ? beyond bounds for empty array"

当下拉tableview时，当超过一定距离时，最下方的cell肯定会超出tableview显示范围，然后在下拉弹回时，会调用- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath方法。

如果在下拉动作中将arr清空，那么在tableview弹回调用此方法时，cell需要从arr中取值，此时会崩溃。

解决:

网络请求成功之后再清空数据源，然后再给数据源赋值,再去reload.

# 左滑删除

IOS UITableViewUITableView小技巧--实现cell向左滑动删除,编辑等功能

//这里是选择哪个cell可以被删除

-(BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath

{

return YES;

}

-(NSArray *)tableView:(UITableView *)tableView editActionsForRowAtIndexPath:(NSIndexPath *)indexPath{

UITableViewRowAction *deleteAction = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleDestructive title:@"删除" handler:^(UITableViewRowAction * _Nonnull action, NSIndexPath * _Nonnull indexPath) {

NSLog(@"点击了删除");

}];

UITableViewRowAction *editAction = [UITableViewRowAction rowActionWithStyle:UITableViewRowActionStyleNormal title:@"编辑" handler:^(UITableViewRowAction * _Nonnull action, NSIndexPath * _Nonnull indexPath) {

NSLog(@"点击了编辑");

}];

editAction.backgroundColor = [UIColor grayColor];

return @[deleteAction, editAction];

}

-(void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath{

editingStyle = UITableViewCellEditingStyleDelete;

}

# 当前时间

+(NSString*)getCurrentTimes{

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];

// ----------设置你想要的格式,hh与HH的区别:分别表示12小时制,24小时制

[formatter setDateFormat:@"YYYY-MM-dd HH:mm:ss"];

//现在时间,你可以输出来看下是什么格式

NSDate *datenow = [NSDate date];

//----------将nsdate按formatter格式转成nsstring

NSString *currentTimeString = [formatter stringFromDate:datenow];

NSLog(@"currentTimeString = %@",currentTimeString);

return currentTimeString;

}

富文本

NSAttributedString *stringmoey = [[NSAttributedString alloc] initWithString:moneyStr attributes:@{

//字体宽度NSKernAttributeName : [NSNumber numberWithInt:3],

NSUnderlineStyleAttributeName:@(NSUnderlineStyleSingle),

//底部横线

NSUnderlineColorAttributeName:[UIColor redColor],

//字体颜色

NSForegroundColorAttributeName:[UIColor redColor]}];

NSAttributedString *stringyonghu = [[NSAttributedString alloc] initWithString:@"元到该用户支付宝" ];

[mutableAttriteStr appendAttributedString:stringmoey];

[mutableAttriteStr appendAttributedString:stringyonghu];

_ShowMoneylabel.attributedText =mutableAttriteStr;

# 拼接字体颜色

-(NSMutableAttributedString*)passString:(NSString*)stringone withSting:(NSString*)secondStr withStringThree:(NSString*)threething{

NSMutableAttributedString *mutableAttriteStr = [[NSMutableAttributedString alloc] initWithString:stringone];

NSAttributedString *stringmoey = [[NSAttributedString alloc] initWithString:secondStr attributes:@{

//字体宽度NSKernAttributeName : [NSNumber numberWithInt:3],

NSUnderlineStyleAttributeName:@(NSUnderlineStyleSingle),

//底部横线

NSUnderlineColorAttributeName:[UIColor redColor],

//字体颜色

NSForegroundColorAttributeName:[UIColor redColor]}];

NSAttributedString *stringyonghu = [[NSAttributedString alloc] initWithString:threething ];

[mutableAttriteStr appendAttributedString:stringmoey];

[mutableAttriteStr appendAttributedString:stringyonghu];

return mutableAttriteStr;

}

/**

# 开始到结束的时间差

-(NSString *)dateTimeDifferenceWithStartTime:(NSString *)startTime endTime:(NSString *)endTime{

NSDateFormatter *date = [[NSDateFormatter alloc]init];

[date setDateFormat:@"yyyy-MM-dd HH:mm:ss"];

NSDate *startD =[date dateFromString:startTime];

NSDate *endD = [date dateFromString:endTime];

NSTimeInterval start = [startD timeIntervalSince1970]*1;

NSTimeInterval end = [endD timeIntervalSince1970]*1;

NSTimeInterval value = end - start;

int second = (int)value %60;//秒

int minute = (int)value /60%60;

int house = (int)value / (24 *3600)%3600;

int day = (int)value / (24 *3600);

NSString *str;

if (day != 0) {

str = [NSString stringWithFormat:@"耗时%d天%d小时%d分%d秒",day,house,minute,second];

}else if (day==0 && house !=0) {

str = [NSString stringWithFormat:@"耗时%d小时%d分%d秒",house,minute,second];

}else if (day==0 && house==0 && minute!=0) {

str = [NSString stringWithFormat:@"耗时%d分%d秒",minute,second];

}else{

str = [NSString stringWithFormat:@"耗时%d秒",second];

}

return str;

}

//获取当前时间日期

NSDate *date=[NSDate date];

NSDateFormatter *format1=[[NSDateFormatter alloc] init];

[format1 setDateFormat:@"yyyy-MM-dd hh:mm:ss"];

NSString *dateStr;

dateStr=[format1 stringFromDate:date];

NSLog(@"%@",dateStr);

# 将array数组转换为string字符串

NSString *str = [array componentsJoinedByString:@","];--分隔符

# 分隔字符串

NSString *string = Zan_number;

NSArray *array1 = [string componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@"::::::"]];

NSLog(@"%@",array1[ 0 ] );

_ZanNumberlabel.text = array1[0];

# 根据字符串截取数组

NSString * str_pic =[NSString stringWithFormat:@"%@",model.cover];

NSArray *array = [str_pic componentsSeparatedByString:@","];

# xib 修改return键盘为 done

收起键盘：通过UITextFieldDelegate协议监听键盘的return按钮时都被点击收回键盘。

我们按住Commond键点击returnKeyType，进去会看到returnKeyType是一个枚举类型，也就是键盘上的返回按钮的类型。

typedef NS_ENUM(NSInteger, UIReturnKeyType) {

UIReturnKeyDefault,

UIReturnKeyGo,

UIReturnKeyGoogle,

UIReturnKeyJoin,

UIReturnKeyNext,

UIReturnKeyRoute,

UIReturnKeySearch,

UIReturnKeySend,

UIReturnKeyYahoo,

UIReturnKeyDone,

UIReturnKeyEmergencyCall,

UIReturnKeyContinue NS_ENUM_AVAILABLE_IOS(9_0),

};

这里的returnKeyType设置类型，只会影响键盘上turnkey位置将显示的文字，如UIReturnKeyDefault显示“换行”，UIReturnKeyGo显示“前往”，UIReturnKeyGoogle显示“搜索”，UIReturnKeyDone显示“完成”。而它的实际点击效果需要在UITextFieldDelegate的代理方法里面去实现。这里需要实现的是如下方法：

-(BOOL)textFieldShouldReturn:(UITextField *)textField;

具体实现方法如下：

-(BOOL)textFieldShouldReturn:(UITextField *)textField {

[_testField resignFirstResponder];

return YES;

}

# pagecontroller的设置

_pageControl = [[UIPageControl alloc] init];

[_viewbotomscroll addSubview:_pageControl];

// _pageControl.frame = CGRectMake(210, 235, 20, 20);//指定位置大小

_pageControl.numberOfPages = count;//指定页面个数

_pageControl.currentPage = 0;//指定pagecontroll的值，默认选中的小白点（第一个）

//添加委托方法，当点击小白点就执行此方法

_pageControl.pageIndicatorTintColor = [UIColor grayColor];// 设置非选中页的圆点颜色

_pageControl.currentPageIndicatorTintColor = [UIColor redColor]; // 设置选中页的圆点颜色

[_pageControl mas_makeConstraints:^(MASConstraintMaker *make) {

make.bottom.equalTo(@-54);

make.centerX.equalTo(_viewbotomscroll);

make.width.height.equalTo(@20);

}];

# 切四个角

1.如果是切四个角的圆角,代码示例:

self.picImage.layer.cornerRadius = 8;

self.picImage.layer.masksToBounds = YES;

# 切两个角

2.如果是四个角中的某几个角,一个,两个,或者3个,代码示例(切的左下,和右下):

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:self.tipLabel.bounds byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(5, 5)];

CAShapeLayer *maskLayer = [[CAShapeLayer alloc] init];

maskLayer.frame = _tipLabel.bounds;

maskLayer.path = maskPath.CGPath;

self.tipLabel.layer.mask = maskLayer;

# runtime

Build Settings 搜索 msg Enable Strict Check of objc 改为NO 不允许检测是否使用底层库

方法欺骗

例子实在一个分类中

//改变连个方法的class

自己调自己将自己的方法修改为系统系统的方法改为自己

// method_exchangeImplementations(<#Method _Nonnull m1#>, <#Method _Nonnull m2#>)

//获取类方法

//class_getClassMethod(<#Class _Nullable __unsafe_unretained cls#>, <#SEL _Nonnull name#>)

//获取对象方法

// class_getInstanceMethod(<#Class _Nullable __unsafe_unretained cls#>, <#SEL _Nonnull name#>)

# kvo 底层实现

创建一个字类 nskvoNotitying_类重写set方法

# 枚举类型

typedef enum : NSUInteger{

IsThem,

IsActive,

isHistory,

}Is_ThemeOrActive;

@property(nonatomic,assign)Is_ThemeOrActive themoractive;

# 字典转模型

.m 内的数据处理不处理闪退

-(void)setValue:(id)value forUndefinedKey:(NSString *)key{

}

-(id)valueForUndefinedKey:(NSString *)key

{

return nil;

}

//有些属性为空了我后续用到经常会崩溃下面这个方法把<null>转为空字符串

-(void)setValuesForKeysWithDictionary:(NSDictionary<NSString *,id> *)keyedValues

{

NSMutableDictionary *dic = [[NSMutableDictionary alloc] initWithDictionary:keyedValues];

NSArray *valueArray= [dic allKeys];

for (NSString *key in valueArray) {

if ([[dic objectForKey:key]isEqual:[NSNull null]]) {

[dic setObject:@" " forKey:key];

}

}

[super setValuesForKeysWithDictionary:dic];

}

# 字典转模型属性声明简单

-(void)propertyCodeWithDictionary:(NSDictionary *)dict

{

NSMutableString *strM = [NSMutableString string];

[dict enumerateKeysAndObjectsUsingBlock:^(id _Nonnull key, id _Nonnull obj, BOOL * _Nonnull stop) {

NSString *str;

NSLog(@"%@",[obj class]);

if ([obj isKindOfClass:NSClassFromString(@"__NSCFString")] || [obj isKindOfClass:NSClassFromString(@"NSTaggedPointerString")] || [obj isKindOfClass:NSClassFromString(@"__NSCFConstantString")]) {

str = [NSString stringWithFormat:@"@property (nonatomic, copy) NSString *%@;",key];

}

if ([obj isKindOfClass:NSClassFromString(@"__NSCFNumber")]) {

str = [NSString stringWithFormat:@"@property (nonatomic, assign) int %@;",key];

}

if ([obj isKindOfClass:NSClassFromString(@"__NSCFArray")]) {

str = [NSString stringWithFormat:@"@property (nonatomic, copy) NSArray *%@;",key];

}

if ([obj isKindOfClass:NSClassFromString(@"__NSCFDictionary")]) {

str = [NSString stringWithFormat:@"@property (nonatomic, copy) NSDictionary *%@;",key];

}

if ([obj isKindOfClass:NSClassFromString(@"__NSCFBoolean")]) {

str = [NSString stringWithFormat:@"@property (nonatomic, assign) BOOL %@;",key];

}

[strM appendFormat:@"\n%@\n",str];

}];

NSLog(@"%@",strM);

}

# xib 高度自适应 iOS8 以后

从nib中加载cell

[self.tableview registerNib:[UINib nibWithNibName:@"HaiXuanCommentCell" bundle:nil] forCellReuseIdentifier:@"haixuancomment"];

self.tableview.rowHeight = UITableViewAutomaticDimension;//设置cell的高度为自动计算，只有才xib或者storyboard上自定义的cell才会生效，而且需要设置好约束

self.tableview.estimatedRowHeight = 280;//必须设置好预估值

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath

{

self.tableview.rowHeight = UITableViewAutomaticDimension;

self.tableview.estimatedRowHeight = 280;

return self.tableview.rowHeight;

}

# 沙箱环境

# 字典拼接数据

NSUserDefaults *userDefaultes = [NSUserDefaults standardUserDefaults];

NSDictionary *dicpremdicer = [userDefaultes objectForKey:@"Allrequest"];

NSMutableDictionary * myHeader = [[NSMutableDictionary alloc] init];

[myHeader setValue:VideoId forKey:@"videoID"];

[myHeader addEntriesFromDictionary:dicpremdicer];

# 限制输入字符

#pragma mark -限制病情描述输入字数(最多不超过25个字)

-(BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text{

//不支持系统表情的输入

if ([[textView textInputMode] primaryLanguage]==nil||[[[textView textInputMode] primaryLanguage]isEqualToString:@"emoji"]) {

return NO;

}

UITextRange *selectedRange = [textView markedTextRange];

//获取高亮部分

UITextPosition *pos = [textView positionFromPosition:selectedRange.start offset:0];

//获取高亮部分内容

//NSString * selectedtext = [textView textInRange:selectedRange];

//如果有高亮且当前字数开始位置小于最大限制时允许输入

if (selectedRange && pos) {

NSInteger startOffset = [textView offsetFromPosition:textView.beginningOfDocument toPosition:selectedRange.start];

NSInteger endOffset = [textView offsetFromPosition:textView.beginningOfDocument toPosition:selectedRange.end];

NSRange offsetRange =NSMakeRange(startOffset, endOffset - startOffset);

if (offsetRange.location < MAX_LIMIT_NUMS) {

return YES;

}else{

return NO;

}

}

NSString *comcatstr = [textView.text stringByReplacingCharactersInRange:range withString:text];

NSInteger caninputlen =MAX_LIMIT_NUMS - comcatstr.length;

if (caninputlen >=0){

return YES;

}else{

NSInteger len = text.length + caninputlen;

//防止当text.length + caninputlen < 0时，使得rg.length为一个非法最大正数出错

NSRange rg = {0,MAX(len,0)};

if (rg.length >0){

NSString*s =@"";

//判断是否只普通的字符或asc码(对于中文和表情返回NO)

BOOL asc = [text canBeConvertedToEncoding:NSASCIIStringEncoding];

if (asc) {

s = [text substringWithRange:rg];//因为是ascii码直接取就可以了不会错

}else{

__block NSInteger idx =0;

__block NSString *trimString =@"";//截取出的字串

//使用字符串遍历，这个方法能准确知道每个emoji是占一个unicode还是两个

[text enumerateSubstringsInRange:NSMakeRange(0, [text length])

options:NSStringEnumerationByComposedCharacterSequences

usingBlock: ^(NSString* substring,NSRange substringRange,NSRange enclosingRange,BOOL*stop) {

if (idx >= rg.length) {

*stop =YES;//取出所需要就break，提高效率

return ;

}

trimString = [trimString stringByAppendingString:substring];

idx++;

}];

s = trimString;

}

//rang是指从当前光标处进行替换处理(注意如果执行此句后面返回的是YES会触发didchange事件)

[textView setText:[textView.text stringByReplacingCharactersInRange:range withString:s]];

//既然是超出部分截取了，哪一定是最大限制了。

self.Label_show_number.text = [NSString stringWithFormat:@"%d/%ld",0,(long)MAX_LIMIT_NUMS];

}

return NO;

}

}

#pragma mark -显示当前可输入字数/总字数

-(void)textViewDidChange:(UITextView *)textView{

UITextRange *selectedRange = [textView markedTextRange];

//获取高亮部分

UITextPosition *pos = [textView positionFromPosition:selectedRange.start offset:0];

//如果在变化中是高亮部分在变，就不要计算字符了

if (selectedRange && pos) {

return;

}

NSString *nsTextContent = textView.text;

NSInteger existTextNum = nsTextContent.length;

if (existTextNum >MAX_LIMIT_NUMS){

//截取到最大位置的字符(由于超出截部分在should时被处理了所在这里这了提高效率不再判断)

NSString *s = [nsTextContent substringToIndex:MAX_LIMIT_NUMS];

[textView setText:s];

}

//不让显示负数

self.Label_show_number.text = [NSString stringWithFormat:@"%ld/%d",MAX(0,MAX_LIMIT_NUMS - existTextNum),MAX_LIMIT_NUMS];

}

# 加载XIB VIEW

CustomView *view = [[NSBundle mainBundle]loadNibNamed:@"xib的名字" owner:self options:nil].lastObject;

# xib 切圆角

layer.cornerRadius

layer.masksToBounds

layer.borderWidth ，注意该 key 对应 Value 的 type 应该设置为 String/Number 两种类型均可

layer.borderColor , 注意该 key 对应 Value 的 type 应该设置为Color

# navigationController 按钮自定义

-(void)configurerightNav{

UIView *shareNavleftView = [[UIView alloc] init];

shareNavleftView.frame = CGRectMake(0.0, 0.0, 191.0, 40.0);

UIButton * label_release =[[UIButton alloc]init];

[label_release setTitle:@"发布" forState:UIControlStateNormal];

label_release.titleLabel.textAlignment = NSTextAlignmentCenter;

label_release.titleLabel.textColor = UIColorFromRGB(0xFFF24C52);

label_release.titleLabel.font = Font(12);

label_release.layer.borderColor=RGBCOLOR(241, 76, 82).CGColor;

label_release.layer.borderWidth=1;

label_release.layer.cornerRadius = 15;

label_release.layer.masksToBounds = YES ;

label_release.frame = CGRectMake(120, 10, 50, 30);

[shareNavleftView addSubview:label_release];

[label_release addTarget:self action:@selector(rightBarButtonItemClick:) forControlEvents:UIControlEventTouchUpInside];

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc]initWithCustomView:shareNavleftView];

}

# cell 选中的自定义

-(void)awakeFromNib {

[super awakeFromNib];

// Initialization code

UIButton *accessBtn = [[UIButton alloc] init];

accessBtn.frame = CGRectMake(0, 0, 15/2.0, 13);

[accessBtn setImage:[UIImage imageNamed:@""] forState:UIControlStateNormal];

[accessBtn setImage:[UIImage imageNamed:@""] forState:UIControlStateHighlighted];

self.accessoryView = accessBtn;

}

-(void)setHighlighted:(BOOL)highlighted animated:(BOOL)animated{

if (highlighted == YES) {

((UIButton *)self.accessoryView).highlighted = YES;

}else{

((UIButton *)self.accessoryView).highlighted = NO;

}

[super setHighlighted:highlighted animated:animated];

}

# EXC_BAD_ACCESS(code=1问题的解决办法

属性申明错误检查

__NSCFNumber isEqualToString:的问题.--[__NSCFNumber isEqualToString:]: unrecognized selector sent to in

-[__NSCFNumber isEqualToString:]: unrecognized selector sent to instance 0x7c2680b0

解析服务器返回的状态码，如果直接跟字符串对比的话，会出现这个错误。网上说将isEqualToString改成isEqual，果然不报错了，但是匹配返回的布尔值跟预期的不一样。

果断将得到数据，再次用nsstring包装下，然后还是用isEqualToString来进行匹配，答案是正确的。

# 编译报错

error: couldn't remove '/Users/mobilewise/Library/Developer/Xcode/DerivedData/MCDM-epoyegaizqaljifbmfuxvovvwxqn/Build/Products/Debug-iphoneos/TencentOpenApi_IOS_Bundle.bundle' after command failed: Directory not empty

Build Phases--->>Copy Bundle Resources,删除TencentOpenApi_IOS_Bundle.bundle

# html innerHTML 属性设置或返回表格行的开始和结束标签之间的 HTML

document.getElementById("tr2").innerHTML（获取标签中的数据）

document.getElementById("demo").innerHTML="点击以后切换成我输入的东西";

document.write() 向文档输出写内容

控制台输出

a = 5;

b = 6;

c = a + b;

console.log(c);

</script>

JavaScript 拥有动态类型。这意味着相同的变量可用作不同的类型

# script 数组字典（对象）

<script>

var person=

{

name : "John",

like : "singing",

id : 5566

};

var nameArray =["0","d","f"];

document.write(person.id + "<br>");

document.write(person["name"] + "<br>");

document.write(person.like+"<br>");

document.write(nameArray[0] + "<br>");

for(let index in nameArray){

document.write(nameArray[index]+ "<br>")

}

for (let x in nameArray)

{

document.write(nameArray[x] + "<br />")

}

</script>s

# 判断图片是否有内容

UIImage *image = [UIImage imageNamed:@""];

CGImageRef cgref = [image CGImage];

CIImage *cim = [image CIImage];

if (cim == nil && cgref == NULL)

{

NSLog(@"no image");

} else {

NSLog(@"imageView has a image");

}

---------------------

# 加载html

UIWebView * webview =[[UIWebView alloc]initWithFrame:self.view.bounds];

webview.delegate=self;

[self.view addSubview:webview];

NSString *content = [_strsaxy stringByReplacingOccurrencesOfString:@"&quot" withString:@"'"];

content = [content stringByReplacingOccurrencesOfString:@"<" withString:@"<"];

content = [content stringByReplacingOccurrencesOfString:@">" withString:@">"];

content = [content stringByReplacingOccurrencesOfString:@""" withString:@"\""];

NSString *htmls = [NSString stringWithFormat:@"<html> \n"

"<head> \n"

"<meta name=\"viewport\" content=\"initial-scale=1.0, maximum-scale=1.0, user-scalable=no\" /> \n"

"<style type=\"text/css\"> \n"

"body {font-size:15px;}\n"

"</style> \n"

"</head> \n"

"<body>"

"<script type='text/javascript'>"

"window.onload = function(){\n"

"var $img = document.getElementsByTagName('img');\n"

"for(var p in $img){\n"

" $img[p].style.width = '100%%';\n"

"$img[p].style.height ='auto'\n"

"}\n"

"}"

"</script>%@"

"</body>"

"</html>",content];

webview.delegate = self;

[webview loadHTMLString:htmls baseURL:nil];

# 字符串特殊符号判断

if ([model.cover rangeOfString:@","].location != NSNotFound) {

// NSLog(@"含有这种符号！");

NSString *string =[NSString stringWithFormat:@"%@", model.cover];

NSArray *array1 = [string componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@","]];

string_image = array1.firstObject;

}else{

string_image = model.cover;

}

# tableView 刷新数据来回跳

-(CGFloat)tableView:(UITableView *)tableView estimatedHeightForRowAtIndexPath:(NSIndexPath *)indexPath

数据做处理

# block声明

/**

* 类型自定义传值页面

*/

typedef void (^ReturnValueBlock) (NSString *strValue);

@interface WebviewVC : UIViewController

/**

* 声明一个ReturnValueBlock属性，这个Block是获取传值的界面传进来的

*/

@property(nonatomic, copy) ReturnValueBlock returnValueBlock;

__weak typeof(self) weakself = self;

if (weakself.returnValueBlock) {

//将自己的值传出去，完成传值

weakself.returnValueBlock([NSString stringWithFormat:@"逆向传回数字"]);

}

/** 收到值的页面 */

self.returnValueBlock = ^(NSString *strValue) {

responseCallback(strValue);

};

# 键盘高度设定

#pragma mark - 键盘通知

-(void)addNoticeForKeyboard {

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardFrameChange:) name:UIKeyboardWillChangeFrameNotification object:nil];

}

//键盘farme值

-(void)keyboardFrameChange:(NSNotification *)notifi{

NSDictionary *userInfo = notifi.userInfo;

CGRect endFrame = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];

CGRect beginFrame = [userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];

CGFloat duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];

UIViewAnimationCurve curve = [userInfo[UIKeyboardAnimationCurveUserInfoKey] integerValue];

void(^animations)(void) = ^{

[self willShowKeyboardFromFrame:beginFrame toFrame:endFrame];

};

void(^completion)(BOOL) = ^(BOOL finished){

};

[UIView animateWithDuration:duration delay:0.0f options:(curve << 16 | UIViewAnimationOptionBeginFromCurrentState) animations:animations completion:completion];

}

-(void)willShowKeyboardFromFrame:(CGRect)beginFrame toFrame:(CGRect)toFrame

{

if (toFrame.origin.y == [[UIScreen mainScreen] bounds].size.height){

//键盘收起

textViewCommen.frame = CGRectMake(10, Main_Screen_Height-40, Main_Screen_Width-80, 30);

commenBtn.frame = CGRectMake(MaxX(textViewCommen)+10, textViewCommen.frame.origin.y, 60, 30);

}else{

//键盘升起

CGFloat keyboardHeight = toFrame.size.height;

NSLog(@"%f",keyboardHeight);

textViewCommen.frame = CGRectMake(10, Main_Screen_Height-30-keyboardHeight, Main_Screen_Width-80, 30);

commenBtn.frame = CGRectMake(MaxX(textViewCommen)+10, textViewCommen.frame.origin.y, 60, 30);

}

}

#tablevie 刷新以后滚到底部

[_HosTableview reloadData];

dispatch_async(dispatch_get_main_queue(), ^{

if(_HosTableview.contentSize.height>self.HosTableview.bounds.size.height){

[self.HosTableview setContentOffset:CGPointMake(0, self.HosTableview.contentSize.height-self.HosTableview.bounds.size.height)];

}

});

# 点九拉伸

-(UIImage *)stretchableImageWithLeftCapWidth:(NSInteger)leftCapWidth topCapHeight:(NSInteger)topCapHeight

这个函数是UIImage的一个实例函数，它的功能是创建一个内容可拉伸，而边角不拉伸的图片，需要两个参数，第一个是左边不拉伸区域的宽度，第二个参数是上面不拉伸的高度。

# 获取主控制器

//获取主控制器

-(UIViewController *)findCurrentViewController

{

UIWindow *window = [[UIApplication sharedApplication].delegate window];

UIViewController *topViewController = [window rootViewController];

while (true) {

if (topViewController.presentedViewController) {

topViewController = topViewController.presentedViewController;

} else if ([topViewController isKindOfClass:[UINavigationController class]] && [(UINavigationController*)topViewController topViewController]) {

topViewController = [(UINavigationController *)topViewController topViewController];

} else if ([topViewController isKindOfClass:[UITabBarController class]]) {

UITabBarController *tab = (UITabBarController *)topViewController;

topViewController = tab.selectedViewController;

} else {

break;

}

}

return topViewController;

}

UIViewController * controller= [self findCurrentViewController];

if ([controller isKindOfClass:[HostrsPublicViewController class]])

# 高度XY获取

CGRectGetHeight返回label本身的高度

CGRectGetMinY返回label顶部的坐标

CGRectGetMaxY 返回label底部的坐标

CGRectGetMinX 返回label左边缘的坐标

CGRectGetMaxX 返回label右边缘的坐标

CGRectGetMidX表示得到一个frame中心点的X坐标

CGRectGetMidY表示得到一个frame中心点的Y坐标

# 经常变换cell的点击

self.viewControllers = @[@"ZFKeyboardViewController",

@"ZFNoramlViewController",

@"ZFTableHeaderViewController",

@"ZFNotAutoPlayViewController",

@"ZFAutoPlayerViewController",

@"ZFSmallPlayViewController",

@"ZFLightTableViewController",

@"ZFMixViewController",

@"ZFDouYinViewController",

@"ZFCollectionViewController",

@"ZFHorizontalCollectionViewController",

@"ZFCollectionViewListController",

@"ZFFullScreenViewController"];

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

[tableView deselectRowAtIndexPath:indexPath animated:YES];

NSString *vcString = self.viewControllers[indexPath.row];

UIViewController *viewController = [[NSClassFromString(vcString) alloc] init];

if ([vcString isEqualToString:@"ZFDouYinViewController"]) {

[(ZFDouYinViewController *)viewController playTheIndex:0];

}

viewController.navigationItem.title = self.titles[indexPath.row];

if ([vcString isEqualToString:@"ZFFullScreenViewController"]) {

[self.navigationController pushViewController:viewController animated:NO];

} else {

[self.navigationController pushViewController:viewController animated:YES];

}

}

2.

-(void)viewDidLoad {

[super viewDidLoad];

self.title = @"✎ YYText Demo ✎";

self.titles = @[].mutableCopy;

self.classNames = @[].mutableCopy;

[self addCell:@"Text Attributes 1" class:@"YYTextAttributeExample"];

[self addCell:@"Text Attributes 2" class:@"YYTextTagExample"];

[self addCell:@"Text Attachments" class:@"YYTextAttachmentExample"];

[self addCell:@"Text Edit" class:@"YYTextEditExample"];

[self addCell:@"Text Parser (Markdown)" class:@"YYTextMarkdownExample"];

[self addCell:@"Text Parser (Emoticon)" class:@"YYTextEmoticonExample"];

[self addCell:@"Text Binding" class:@"YYTextBindingExample"];

[self addCell:@"Copy and Paste" class:@"YYTextCopyPasteExample"];

[self addCell:@"Undo and Redo" class:@"YYTextUndoRedoExample"];

[self addCell:@"Ruby Annotation" class:@"YYTextRubyExample"];

[self addCell:@"Async Display" class:@"YYTextAsyncExample"];

[self.tableView reloadData];

}

-(void)addCell:(NSString *)title class:(NSString *)className {

[self.titles addObject:title];

[self.classNames addObject:className];

}

#pragma mark - Table view data source

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {

return _titles.count;

}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"YY"];

if (!cell) {

cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"YY"];

}

cell.textLabel.text = _titles[indexPath.row];

return cell;

}

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

NSString *className = self.classNames[indexPath.row];

Class class = NSClassFromString(className);

if (class) {

UIViewController *ctrl = class.new;

ctrl.title = _titles[indexPath.row];

[self.navigationController pushViewController:ctrl animated:YES];

}

[self.tableView deselectRowAtIndexPath:indexPath animated:YES];

}

# cell连续点击问题处理

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

if (cellSelected) {

return;

}else{

cellSelected = YES;

[self performSelector:@selector(didSelectRowAtIndexPath:) withObject:indexPath];

//[self performSelector:@selector(didSelectRowAtIndexPath:) withObject:indexPath afterDelay:2.0]; // 延迟执行,不推荐

}

}

-(void)didSelectRowAtIndexPath:(NSIndexPath *)indexPath{

NSLog(@"%ld",indexPath.row);

// 模拟事件处理，2秒之后再次响应

// do something

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

cellSelected = NO;

});

}

# A跳B跳A循环跳转

{

MusciStarDetialController *stardetialVC = [[MusciStarDetialController alloc]init];

NSString * modeluser_id =[NSString stringWithFormat:@"%@",_active_model.user_id];

stardetialVC.ID =modeluser_id;

NSString *role_id = [NSString stringWithFormat:@"%@",_active_model.role_id];

// stardetialVC.pass_role_id =role_id;

#pragma mark===== 跳转琴行

if ([role_id isEqualToString:registDome]||[role_id isEqualToString:VIPDom]||[role_id isEqualToString:CertificationDom]) {

ClassDetialController *classDetialVC = [[ClassDetialController alloc] init];

classDetialVC.store_id =modeluser_id ;

classDetialVC.ID = modeluser_id;

classDetialVC.pass_sceond_store_id = role_id;

self.navigationController.hidesBottomBarWhenPushed = YES;

NSMutableArray *pageArray = [self.navigationController.viewControllers mutableCopy];

static NSString * stingpass;

[pageArray enumerateObjectsWithOptions:NSEnumerationReverse usingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

if ([obj isKindOfClass:[ClassDetialController class]]) {

stingpass = @"1";

}

}];

if ([stingpass isEqualToString:@"1"]) {

for (int i = 0; i<pageArray.count; i++) {

id vc = pageArray[i];

if ([vc isKindOfClass:[ClassDetialController class]]) {

[self.navigationController popToViewController:vc animated:NO];

}

}

}else{

[self.navigationController pushViewController:classDetialVC animated:YES];

}

}

}

# oc swift混编

一种系统自己创建桥接文件

2 file newfile headefile - objective-c Bridging Header 直接拖进去

桥接文件包含OC文件

OC的头文件 /*oc _ swift 需要包含这个头文件项目名称-Swift.h*/

#import "IOStestOC-Swift.h"

#tableview 滚动到底部只第一次执行

1.-(void)viewDidLoad {

[super viewDidLoad];

self.scrollBottom = NO;

}

2. - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

if (_scrollBottom == NO) { //只在初始化的时候执行

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.005 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

if (_HostiMutarray.count > 0) {

NSIndexPath *indexPath = [NSIndexPath indexPathForRow:([self.HosTableview numberOfRowsInSection:0]-1) inSection:0];

[self.HosTableview scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:NO];

}

});

}

return _HostiMutarray.count;

}

3. -(void)scrollViewDidScroll:(UIScrollView *)scrollView{

CGFloat height = scrollView.frame.size.height;

CGFloat contentOffsetY = scrollView.contentOffset.y;

CGFloat bottomOffset = scrollView.contentSize.height - contentOffsetY;

if (bottomOffset <= height)

{

//在最底部

}

else

{

if (_scrollBottom == NO) {

_scrollBottom = YES;

[self.HosTableview scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:[_HostiMutarray count] - 1 inSection:0] atScrollPosition:UITableViewScrollPositionBottom animated:YES];

}

}

}

# view 跳转 vc nav 跳转

// 取到tabbarcontroller

UITabBarController*tabBarController =(UITabBarController*) [UIApplication sharedApplication].keyWindow.rootViewController;

// 取到navigationcontroller

UINavigationController * nav = (UINavigationController *)tabBarController.selectedViewController;

[nav pushViewController:changevc animated:YES];

# tableview 下拉背景色

UIView *tableBackgroundView = [[UIView alloc]initWithFrame:self.squareTableview.bounds];

tableBackgroundView.backgroundColor = [UIColor whiteColor];

self.squareTableview.backgroundView = tableBackgroundView;

#NSDictionary使用中value遇到no summary如何判断为NULL

   -(BOOL)isNull:(NSDictionary*)dict key:(NSString*)key{

   if(![dict objectForKey:key]){

   return NO;

   }

   id obj = [dict objectForKey:key];// judge NSNull

   BOOL isNull = [obj isEqual:[NSNull null]];

   return isNull;

   }

#iOS生成图片

   -(UIImage *)snapshotSingleView:(UIView *)view

   {

UIGraphicsBeginImageContextWithOptions(view.bounds.size, NO, 0.0);

   [view.layer renderInContext:UIGraphicsGetCurrentContext()];

   UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

   UIGraphicsEndImageContext();

   return image;

   }

#iOS 添加全屏遮盖图，能遮住navigationBar和tabBar

[[UIApplication sharedApplication].keyWindow addSubview:_view];

# 页面返回无效遍历视图栈的所有元素，找到目标视图，将目标视图创建新对象，再使用popToViewController:animated:

for (UIViewController *vc in self.navigationController.childViewControllers) {

if ([vc isKindOfClass:[AViewController class]]) {

AViewController *mainVC = (AViewController *)vc;

[self.navigationController popToViewController:mainVC animated:YES];

}

}

# 图片裁剪适配

-(void)passChangemodel:(NSURL*)model_url{

[[SDWebImageDownloader sharedDownloader]downloadImageWithURL:model_url options:0 progress:nil completed:^(UIImage * _Nullable image, NSData * _Nullable data, NSError * _Nullable error, BOOL finished) {

if (!error && image) {

UIImage * CutImage = [self cutImage:image];

self.imagecover.image = CutImage;

}else {

self.imagecover.image = [UIImage imageNamed:@"3e0ae031690a4e77b64a0bc2f7d5033.jpg"];

}

}];

}

-(UIImage*)cutImage:(UIImage*)image{//压缩图片

CGSize newSize;CGImageRef imageRef = nil;

if ((image.size.width / image.size.height) < (_imagecover.size.width / _imagecover.size.height)) {

newSize.width = image.size.width;newSize.height = image.size.width * _imagecover.size.height / _imagecover.size.width;imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(0, fabs(image.size.height - newSize.height) / 2, newSize.width, newSize.height));

} else {

newSize.height = image.size.height;newSize.width = image.size.height * _imagecover.size.width / _imagecover.size.height;imageRef = CGImageCreateWithImageInRect([image CGImage], CGRectMake(fabs(image.size.width - newSize.width) / 2, 0, newSize.width, newSize.height));}

return [UIImage imageWithCGImage:imageRef];

}

# 底部导航条遮挡文字

_squareTableview.contentInset = UIEdgeInsetsMake(0, 0, self.tabBarController.tabBar.frame.size.height, 0);

# collection view 刷新闪动修改

[UIView performWithoutAnimation:^{

//刷新界面

[self.mycollectionview reloadData];

}];

# 修改alter view颜色字体

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];

UIAlertAction *action1 = [UIAlertAction actionWithTitle:@"拍照" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

[self goCameraViewController];

}];

UIAlertAction *action2 = [UIAlertAction actionWithTitle:@"手机上传" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {

[self directGoPhotoViewController];

}];

UIAlertAction *action3 = [UIAlertAction actionWithTitle:[NSBundle hx_localizedStringForKey:@"取消"] style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {

}];

[action1 setValue:UIColorFromRGB(0xF44B50) forKey:@"_titleTextColor"];

[action2 setValue:UIColorFromRGB(0xF44B50) forKey:@"_titleTextColor"];

[action3 setValue:UIColorFromRGB(0x333333) forKey:@"_titleTextColor"];

[alertController addAction:action1];

[alertController addAction:action2];

[alertController addAction:action3];

[self.viewController presentViewController:alertController animated:YES completion:nil];

# 绘图的生命周期

-(void)viewDidLoad {

[super viewDidLoad];

_testView = [[TestView alloc] init];

NSLog(@"_testView 初始化完毕");

_testView.frame = CGRectMake(0, 0, 20, 20);

NSLog(@"_testView frame 初始化完毕");

[self.view addSubview:_testView];

NSLog(@"_testView 加载到父类完毕");

NSLog(@"viewDidLoad");

}

-(void)viewWillAppear:(BOOL)animated

{

[super viewWillAppear:animated];

NSLog(@"viewWillAppear");

}

-(void)viewDidAppear:(BOOL)animated

{

[super viewDidAppear:animated];

NSLog(@"viewDidAppear");

}

2017-08-09 17:27:41.719 test2[89697:3696127] _testView 初始化完毕

2017-08-09 17:27:41.719 test2[89697:3696127] _testView frame 初始化完毕

2017-08-09 17:27:41.720 test2[89697:3696127] _testView 加载到父类完毕

2017-08-09 17:27:41.720 test2[89697:3696127] viewDidLoad

2017-08-09 17:27:41.720 test2[89697:3696127] viewWillAppear

2017-08-09 17:27:41.724 test2[89697:3696127] layoutSubviews

2017-08-09 17:27:41.724 test2[89697:3696127] drawRect

2017-08-09 17:27:41.726 test2[89697:3696127] viewDidAppear

# iPhoneX 底部偏移

//去掉tabbar的透明度

[[UITabBar appearance] setTranslucent:NO];

# 设置textview显示框内容不可编辑不可选择。

textView.editable=NO;//设置可编辑属性

textView.selectable=NO;//设置可选择属性

# 防止输入时在中文后输入英文过长直接中文和英文换行

-(void)textViewDidChange:(UITextView *)textView {

//防止输入时在中文后输入英文过长直接中文和英文换行

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

paragraphStyle.lineBreakMode = NSLineBreakByCharWrapping;

NSDictionary *attributes = @{

NSFontAttributeName:[UIFont systemFontOfSize:14],

NSParagraphStyleAttributeName:paragraphStyle

};

textView.attributedText = [[NSAttributedString alloc] initWithString:textView.text attributes:attributes];

}

///防止拼音输入时，文本直接获取拼音

UITextRange *selectedRange = [textView markedTextRange];

NSString * newText = [textView textInRange:selectedRange]; //获取高亮部分

if(newText.length>0)

{

return;

}

# view 返回VC

dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

UIViewController * vc =[self viewController];

[vc.navigationController popToRootViewControllerAnimated:NO];

});

-(UIViewController *)viewController

{

//获取当前view的superView对应的控制器

UIResponder *next = [self nextResponder];

do {

if ([next isKindOfClass:[UIViewController class]]) {

return (UIViewController *)next;

}

next = [next nextResponder];

} while (next != nil);

return nil;

}

# 将 < 等类似的字符转化为HTML中的“<”等

-(NSString *)htmlEntityDecode:(NSString *)string

{

string = [string stringByReplacingOccurrencesOfString:@""" withString:@"\""];

string = [string stringByReplacingOccurrencesOfString:@"'" withString:@"'"];

string = [string stringByReplacingOccurrencesOfString:@"<" withString:@"<"];

string = [string stringByReplacingOccurrencesOfString:@">" withString:@">"];

string = [string stringByReplacingOccurrencesOfString:@"&" withString:@"&"]; // Do this last so that, e.g. @"&lt;" goes to @"<" not @"<"

return string;

}

# 获取点击的indexpath

[cell.btnFreeBankCard addTarget:self action:@selector(unbundleBankCard:event:) forControlEvents:UIControlEventTouchUpInside];

/**

标记标签

@param sender 发送者

*/

-(void)unbundleBankCard:(UIButton *)sender event:(UIEvent *)event

{

NSSet *touches = [event allTouches];

UITouch *touch = [touches anyObject];

CGPoint currentTouchPosition = [touch locationInView:self.tableView];

NSIndexPath *indexPath =[self.tableView indexPathForRowAtPoint:currentTouchPosition];

........

处理按钮点击事件

}

字典转NSData去掉空格换行

-(NSString *)convertToJsonData:(NSDictionary *)dict{

NSError *error; //NSJSONWritingSortedKeys NSJSONWritingPrettyPrinted 设置为nil可以去掉空格和换行

NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dict options:nil error:&error];

NSString *jsonString;

if (!jsonData) {

}else{

jsonString = [[NSString alloc]initWithData:jsonData encoding:NSUTF8StringEncoding];      }

          return jsonString;

}

iOS AES 加密

-(NSString*)AESstringPass:(NSDictionary *)dict{

NSString* jasonSting =[self convertToJsonData:dict];

//AES 加密

NSString* aeStr =[self AES128Encrypt:jasonStingkey:@"88888888888"];

//url字符串中具有特殊功能的特殊字符的字符串，或者中文字符,作为参数传递时，需要用encode处理一下对有特殊符号的URL做处理（将特殊字符进行转码）

aeStr = [self URLencodeString:aeStr];

returnaeStr;

}

加密

//AES加密 #import <CommonCrypto/CommonCrypto.h>#import <CommonCrypto/CommonDigest.h>

-(NSString*)AES128Encrypt:(NSString*)plainTextkey:(NSString*)key{

char keyPtr[kCCKeySizeAES128+1];

memset(keyPtr,0,sizeof(keyPtr));

[keygetCString:keyPtr maxLength:sizeof(keyPtr) encoding:NSUTF8StringEncoding];

NSData* data = [plainText dataUsingEncoding:NSUTF8StringEncoding];

NSUIntegerdataLength = [datalength];

size_tbufferSize = dataLength +kCCBlockSizeAES128;

void*buffer =malloc(bufferSize);

size_tnumBytesEncrypted =0;

CCCryptorStatuscryptStatus =CCCrypt(kCCEncrypt,

kCCAlgorithmAES128,

kCCOptionPKCS7Padding|kCCOptionECBMode,

keyPtr,

kCCBlockSizeAES128,

NULL,

[databytes],

dataLength,

buffer,

bufferSize,

&numBytesEncrypted);

if(cryptStatus ==kCCSuccess) {

NSData*resultData = [NSDatadataWithBytesNoCopy:bufferlength:numBytesEncrypted];

NSString*stringBase64 = [resultDatabase64EncodedStringWithOptions:0];

//base64格式的字符串

returnstringBase64;

}

free(buffer);

return nil;

}

url字符串encode处理一下

-(NSString*)URLencodeString:(NSString*)unencodedString{

// CharactersToBeEscaped = @":/?&=;+!@#$()~',*";

// CharactersToLeaveUnescaped = @"[].";

NSString *encodedString = (NSString *)CFBridgingRelease(CFURLCreateStringByAddingPercentEscapes(kCFAllocatorDefault,

(CFStringRef)unencodedString,

NULL,

(CFStringRef)@"!*'();:@&=+$,/?%#[]",

kCFStringEncodingUTF8));

return encodedString;

}

AFNetworking Post 加密字符串给服务器

-(void)PostString:(NSString*)URLStringPostString:(id)dict succeed:(void(^)(id))succeed failure:(void(^)(NSError*))failure{

//创建网络请求管理对象

AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

manager.requestSerializer.timeoutInterval = 30;

manager.requestSerializer.stringEncoding = NSUTF8StringEncoding;

manager.requestSerializer = [AFHTTPRequestSerializer serializer];

manager.responseSerializer = [AFHTTPResponseSerializer serializer];

[manager.requestSerializer setValue:@"text/html" forHTTPHeaderField:@"Accept"];

[manager.requestSerializer setValue:@"text/html" forHTTPHeaderField:@"Content-Type"];

[manager.requestSerializer setQueryStringSerializationWithBlock:^NSString*_Nonnull(NSURLRequest*_Nonnull request,id _Nonnull parameters,NSError*_Nullable__autoreleasing*_Nullable error) {

//在这里面对parameters进行处理

return dict;

}];

[manager POST:URLString parameters:dict progress:nil success:^(NSURLSessionDataTask*_Nonnull task,id _Nullable responseObject) { NSDictionary * jasonDic =[NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil];

succeed(jasonDic);

if(![jasonDic[@"status"]isEqualToString:@"SUCCESS"]) {

NSString* strinfo =[NSString stringWithFormat:@"%@",jasonDic[@"data"][@"info"]];

}

}failure:^(NSURLSessionDataTask*_Nullable task,NSError*_Nonnull error) {

failure(error);

}];

}

UINavigationController下移不能铺满全屏

在iOS13之前UINavigationController默认属性是UIModalPresentationFullScreen；

在iOS13默认属性是UIModalPresentationAutomatic；

所以我们要手动设置 NavigationController.modalPresentationStyle = UIModalPresentationFullScreen;

nil passed to a Callee that requires a non-null 1st parameter

意思是形参不能传nil。

Object leaked: object allocated and stored into 'CoreFoundation' is not referenced later in this execution path and has a retain count of +1

CoreFoundation 使用了Create 就要使用 CFRelease( );

Returning 'self' while it is not set to the result of '[(super

self= [super initWithStyle:stylereuseIdentifier:reuseIdentifier];

if (self) {

}

return self;

Value stored to 'MainViewColor' during its initialization is never read

定义的数据没被使用直接注释就可以了

Xcode 11.4.1 Building for iOS Simulator, but the linked library '******.a' was built for iOS.

解决办法

Xcode->File->Workspace Settings->Build System->Legacy Build System