总结一些自己常用到，并且比较实用的开发技巧或者工具之类的干货吧。
归纳在一起，平时查阅起来就比较方便了。
（一）字符类
1. NSString与int和float的相互转换
1.1 字符串拼接
NSString *str1 = @"abc";
NSString *str2 = @"123";
NSString *newString = [NSString stringWithFormat:@"%@%@",str1,str2];
1.2 字符转int
NSString *str3 = @"456";
int intString = [str3 intValue];
1.3 int转字符
NSString *stringInt = [NSString stringWithFormat:@"%d",intString];
1.4 字符转float
float floatString = [stringInt floatValue];
1.5 float转字符
NSString *stringFloat = [NSString stringWithFormat:@"%f",floatString];
2. 使用 arc4random 生成随机数
2.1获取一个随机整数范围在：[0,100)包括0，不包括100
int o = arc4random() % 100;
2.2 获取一个随机数范围在：[100,200]，包括100，包括200
int t =100 + (arc4random() % 101);
2.3 获取一个随机整数，范围在[from,to]，包括from，包括to
-(int)getRandomNumber:(int)from to:(int)to{
return (int)(from + (arc4random() % (to - from) + 1));
}
（二）宏定义
1. 各机型屏幕宽高适配
/** .m文件 */
#import <Foundation/Foundation.h>
//各机型屏幕宽高适配
#define ISIPHONE [[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone
#define ISIPHONE5 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 1136), [[UIScreen mainScreen] currentMode].size) : NO)
#define ISIPHONE4 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(640, 960), [[UIScreen mainScreen] currentMode].size) : NO)
#define ISIPHONE6 ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(750, 1334), [[UIScreen mainScreen] currentMode].size) : NO)
#define ISIPHONE6plus ([UIScreen instancesRespondToSelector:@selector(currentMode)] ? CGSizeEqualToSize(CGSizeMake(1080, 1920), [[UIScreen mainScreen] currentMode].size) : NO)
//对应屏幕分辨率
/*
iPhone设备 尺寸 分辨率 点
iPhone 3和3s 3.5英寸 (320×480) 320×480
iPhone 4和4s 3.5英寸 (640×960) 320×480
iPhone 5和5s 4.0英寸 (640×1136) 320×568
iPhone 6 4.7英寸 (750×1334) 375×667
iPhone6 Plus：5.5英寸 (1080×1920) 414x736(打印测试出来的)
*/
#define NeedHightForiPhone5 568
#define NeedWidthForiPhone5 320
#define NeedHightForiPhone4 480
#define NeedWidthForiPhone4 320
#define NeedHightForiPhone6 667
#define NeedWidthForiPhone6 375
#define NeedHightForiPhone6plus 736
#define NeedWidthForiPhone6plus 414
#define SCALE_LOGICALPT_TO_DEVICEPX ([[UIScreen mainScreen] scale])
#define POINT_TO_PIXEL(x) (x*SCALE_LOGICALPT_TO_DEVICEPX)
#define PIXEL_TO_POINT(x) (x/SCALE_LOGICALPT_TO_DEVICEPX)
#define TIMEOUT_VOICECALL_ENTER_STUDYROOM 50
@interface GlobalUtils : NSObject
+ (CGSize)selfBounds;
@end
/** .h文件 */
#import "GlobalUtils.h"
#import <AVFoundation/AVAudioSession.h>
@implementation GlobalUtils
//不同机型的宽高
+(CGSize)selfBounds
{
CGSize size;
if (ISIPHONE4) {
size=CGSizeMake(NeedWidthForiPhone4, NeedHightForiPhone4);
}
else if (ISIPHONE5) {
size=CGSizeMake(NeedWidthForiPhone5, NeedHightForiPhone5);
}
else if (ISIPHONE6)
{
size=CGSizeMake(NeedWidthForiPhone6, NeedHightForiPhone6);
}
else if (ISIPHONE6plus)
{
size=CGSizeMake(NeedWidthForiPhone6plus, NeedHightForiPhone6plus);
}
return size;
}
@end
（三）工具类
1. 正则表达式
1.1 验证邮箱格式
+(BOOL)isValidateEmail:(NSString *)email {
NSString *emailRegex = @"[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}";
NSPredicate *emailTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", emailRegex];
return [emailTest evaluateWithObject:email];
}
1.2 判断手机号码
+(BOOL)isMobileNumber:(NSString *)mobileNum{
NSString *MOBILE =@"^1+[3578]+\\d{9}";
NSPredicate *regextestmobile = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", MOBILE];
if ([regextestmobile evaluateWithObject:mobileNum] == YES) {
return YES;
}
else{
return NO;
}
}
2. 验证码倒计时
+ (void)timeDown:(UIButton *)button;
{
//设置倒计时
__block int timeout = 10; //倒计时时间
dispatch_queue_t queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0,queue);
dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒执行
dispatch_source_set_event_handler(_timer, ^{
if(timeout<=0){ //倒计时结束，关闭
dispatch_source_cancel(_timer);
dispatch_async(dispatch_get_main_queue(), ^{
//设置界面的按钮显示 根据自己需求设置
button.userInteractionEnabled = YES;
[button setTitle:@"验证码" forState:UIControlStateNormal];
button.backgroundColor = [UIColor orangeColor];
button.layer.cornerRadius = button.height/5;
});
}else{//倒计时开始
int seconds = timeout % 60;
NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];
dispatch_async(dispatch_get_main_queue(), ^{
//设置界面的按钮显示 根据自己需求设置
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:1];
[button setTitle:[NSString stringWithFormat:@"%@秒",strTime] forState:UIControlStateNormal];
[UIView commitAnimations];
button.userInteractionEnabled = NO;
button.backgroundColor = [UIColor lightGrayColor];
});
timeout--;
}
});
dispatch_resume(_timer);
}
3. 给输入框（UITextField）的左侧设置图标
/**
* 给UITextField设置左侧的图片
*
* @param textField UITextField
* @param imageName 图片名称
*/
+(void)setLeftViewWithTextField:(UITextField *)textField imageName:(NSString *)imageName{
UIImageView *leftView = [[UIImageView alloc]initWithFrame:CGRectMake(20, 0, 40, 40)];
leftView.image = [UIImage imageNamed:imageName];
leftView.contentMode = UIViewContentModeCenter;
textField.leftView = leftView;
textField.leftViewMode = UITextFieldViewModeAlways;
}
4. 设置RGB为image
+ (UIImage *)imageWithColor:(UIColor *)color
{
CGRect rect = CGRectMake(0, 0, 1, 1);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetFillColorWithColor(context, [color CGColor]);
CGContextFillRect(context, rect);
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return image;
}
5. Image转换成color
[UIColor colorWithPatternImage:[UIImageimageNamed:@“bg.png"]];
6. 隐藏UITableView（cell）多余的分割线
+ (void)setExtraCellLineHidden: (UITableView *)tableView
{
UIView *view =[ [UIView alloc]init];
view.backgroundColor = [UIColor clearColor];
[tableView setTableFooterView:view];
}
