1、添加系统提示音和震动
2、在xib 中使用 UIScrollView，但是问题是.m文件中设置contentsize 无效
3、将数组中的内容分拼接成字符串
4、判断字典是否包含特定Key值
5、过滤emoji表情键盘输入，包含输入哈哈引出的微笑表情
6、dismissViewController到根视图
7、pop返回到指定控制器
8、数据处理 (比较两个数组，并除去相同元素)
1、添加系统提示音和震动
- 工程下添加
AudioToolbox.framework - 添加头文件
#import <AudioToolbox/AudioToolbox.h> - appDelegate的代理方法didReceiveRemoteNotification中添加
AudioServicesPlaySystemSound(1007);//系统提示音 AudioServicesPlaySystemSound(kSystemSoundID_Vibrate);//震动
2、在xib 中使用 UIScrollView，但是问题是.m文件中设置contentsize 无效
- 问题分析
xib 中勾选了autolayout选项，在autolayout下，iOS计算UIScrollView的contentsize的机制是略有不同。在autolayout中，会在viewDidAppear之前根据subview的constraint重新计算UIScrollView的contentsize。 当在viewdidload里手动设置contentsize时，会再重新计算一次，把前面手动设置的值覆盖掉。 - 解决方法
1 去除autolayout选项，自己手动设置contentsize
2 如果要使用autolayout，则需要设置subview的constraint，让系统自动根据constraint计算出contentsize
3 在viewDidAppear里面自己手动设置contentsize
3、将数组中的内容分拼接成字符串
NSString *string = [array componentsJoinedByString:@","];//用,分割
打印array：(
1,
2,
)
打印string：1,2
4、判断字典是否包含特定Key值
if([[dict allKeys] containsObject:@"key"]){
//有
}else{
//没有
}
5、过滤emoji表情键盘输入，包含输入哈哈引出的微笑表情
当选择表情键盘输入时return NO
- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text
{
// 不让输入表情
if ([textView isFirstResponder]) {
//表情键盘
if ([[[textView textInputMode] primaryLanguage] isEqualToString:@"emoji"] || ![[textView textInputMode] primaryLanguage]) {
return NO;
}else{//
return ![self stringContainsEmoji:text];
}
}
return YES;
}
// 过滤所有表情 https://gist.github.com/cihancimen/4146056
- (BOOL)stringContainsEmoji:(NSString *)string {
__block BOOL returnValue = NO;
[string enumerateSubstringsInRange:NSMakeRange(0, [string length]) options:NSStringEnumerationByComposedCharacterSequences usingBlock:
^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
const unichar hs = [substring characterAtIndex:0];
// surrogate pair
if (0xd800 <= hs && hs <= 0xdbff) {
if (substring.length > 1) {
const unichar ls = [substring characterAtIndex:1];
const int uc = ((hs - 0xd800) * 0x400) + (ls - 0xdc00) + 0x10000;
if (0x1d000 <= uc && uc <= 0x1f77f) {
returnValue = YES;
}
}
} else if (substring.length > 1) {
const unichar ls = [substring characterAtIndex:1];
if (ls == 0x20e3) {
returnValue = YES;
}
} else {
// non surrogate
// if (0x2100 <= hs && hs <= 0x27ff) {
// returnValue = YES;
// }
if (0x2B05 <= hs && hs <= 0x2b07) {
returnValue = YES;
} else if (0x2934 <= hs && hs <= 0x2935) {
returnValue = YES;
} else if (0x3297 <= hs && hs <= 0x3299) {
returnValue = YES;
} else if (hs == 0xa9 || hs == 0xae || hs == 0x303d || hs == 0x3030 || hs == 0x2b55 || hs == 0x2b1c || hs == 0x2b1b || hs == 0x2b50) {
returnValue = YES;
}
}
}];
return returnValue;
}
6、dismissViewController到根视图
如果是在Controller中 则代码如下
UIViewController *vc = self;
while (vc.presentingViewController) {
vc = vc.presentingViewController;
}
[vc dismissViewControllerAnimated:YES completion:nil];
如果是在视图(View)中 则代码如下
-(void)backClick{
UIViewController *vc = [self viewController];
while (vc.presentingViewController) {
vc = vc.presentingViewController;
}
[vc dismissViewControllerAnimated:YES completion:nil];
}
/** 获取当前view的controller */
- (UIViewController *)viewController
{
for (UIView *next = [self superview]; next; next = next.superview) {
UIResponder *nextResponser = [next nextResponder];
if ([nextResponser isKindOfClass:[UIViewController class]]) {
return (UIViewController *)nextResponser;
}
}
return nil;
}
该代码可返回到根(通过present过来的)Controller
7、pop返回到指定控制器
方法一
UIViewController *viewCtl = self.navigationController.viewControllers[1];
[self.navigationController popToViewController:viewCtl animated:YES];
方法二
for (UIViewController *controller in self.navigationController.viewControllers) {
if ([controller isKindOfClass:[SetupViewController class]]) {
SetupViewController *revise =(SetupViewController *)controller;
[self.navigationController popToViewController:revise animated:YES];
}
}
8、数据处理 (比较两个数组，并除去相同元素)
NSArray * arr1 = @[@1,@2,@3];
NSArray * arr2 = @[@2,@3,@4,@5];
NSPredicate * filterPredicate = [NSPredicate predicateWithFormat:@"NOT (SELF IN %@)",arr1];
NSArray * filter = [arr2 filteredArrayUsingPredicate:filterPredicate];
NSLog(@"%@",filter);
打印：
2018-12-20 10:51:59.792762+0800 demo[2898:47742] (
4,
5
)
