倒计时按钮，iOS

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用一个button实现倒计时效果：

@interface UIButton (CountDown)/* *    倒计时按钮 *    @param timeLine  倒计时总时间 *    @param title     还没倒计时的title *    @param subTitle  倒计时的子名字 如：时、分 *    @param mColor    还没倒计时的颜色 *    @param color     倒计时的颜色 */- (void)startWithTime:(NSInteger)timeLine title:(NSString *)title countDownTitle:(NSString *)subTitle mainColor:(UIColor *)mColor countColor:(UIColor *)color;@end

@implementation UIButton (CountDown)- (void)startWithTime:(NSInteger)timeLine title:(NSString *)title countDownTitle:(NSString *)subTitle mainColor:(UIColor *)mColor countColor:(UIColor *)color{    // 倒计时时间    __block NSInteger timeOut = timeLine;    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);        // 每秒执行一次    dispatch_source_set_timer(_timer, dispatch_walltime(NULL, 0), 1.0 * NSEC_PER_SEC, 0);    dispatch_source_set_event_handler(_timer, ^{               // 倒计时结束，关闭        if (timeOut <= 0) {            dispatch_source_cancel(_timer);                        dispatch_async(dispatch_get_main_queue(), ^{                                self.backgroundColor = mColor;                [self setTitle:title forState:UIControlStateNormal];                self.userInteractionEnabled = YES;            });                    }else{                    int seconds = timeOut % 60;            NSString * timeStr = [NSString stringWithFormat:@"%0.2d",seconds];                        dispatch_async(dispatch_get_main_queue(), ^{                self.backgroundColor = color;                [self setTitle:[NSString stringWithFormat:@"%@%@",timeStr,subTitle] forState:UIControlStateNormal];                self.userInteractionEnabled = NO;            });                        timeOut--;        }    });        dispatch_resume(_timer);}@end

实际使用代码：

- (void)viewDidLoad {    [super viewDidLoad];        UIButton * countDownBtn = [[UIButton alloc]initWithFrame:CGRectMake(110, 150, 120, 40)];    [countDownBtn setTitle:@"获取验证码" forState:UIControlStateNormal];    countDownBtn.backgroundColor = [UIColor colorWithRed:84 / 255.0 green:180 / 255.0 blue:98 / 255.0 alpha:1.0f];    [countDownBtn addTarget:self action:@selector(countDownBtnAction:) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:countDownBtn];}- (void)countDownBtnAction:(UIButton *)button{    [button startWithTime:60 title:@"点击重新获取" countDownTitle:@"s" mainColor:[UIColor colorWithRed:84 / 255.0 green:180 / 255.0 blue:98 / 255.0 alpha:1.0f] countColor:[UIColor colorWithRed:84 / 255.0 green:180 / 255.0 blue:98 / 255.0 alpha:1.0f]];}

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