UIButton添加倒计时

 1 //获取验证码按钮
 2 - (IBAction)getButtonClick:(UIButton *)sender;
 3 
 4 #pragma mark - 获取验证码
 5 - (IBAction)getButtonClick:(UIButton *)sender
 6 {
 7     //正常状态下的背景颜色
 8     UIColor *mainColor = [UIColorcolorWithRed:84/255.0green:180/255.0blue:98/255.0alpha:1.0f];
 9     //倒计时状态下的颜色
10     UIColor *countColor = [UIColorlightGrayColor];
11     [selfsetTheCountdownButton:sender startWithTime:5title:@"获取验证码"countDownTitle:@"s"mainColor:mainColor countColor:countColor];
12 }
13 
14 #pragma mark - button倒计时
15 - (void)setTheCountdownButton:(UIButton *)button startWithTime:(NSInteger)timeLine title:(NSString *)title countDownTitle:(NSString *)subTitle mainColor:(UIColor *)mColor countColor:(UIColor *)color {
16     //倒计时时间
17     __block NSInteger timeOut = timeLine;
18     dispatch_queue_t queue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0);
19     dispatch_source_t _timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER,0, 0, queue);
20     //每秒执行一次
21     dispatch_source_set_timer(_timer,dispatch_walltime(NULL,0), 1.0 * NSEC_PER_SEC,0);
22     dispatch_source_set_event_handler(_timer, ^{
23 
24         //倒计时结束，关闭
25         if (timeOut == 0) {
26             dispatch_source_cancel(_timer);
27             dispatch_async(dispatch_get_main_queue(), ^{
28                 button.backgroundColor = mColor;
29                [button setTitle:titleforState:UIControlStateNormal];
30                 button.userInteractionEnabled =YES;
31             });
32         } else {
33             int seconds = timeOut % 60;
34             NSString *timeStr = [NSStringstringWithFormat:@"%0.1d", seconds];
35             dispatch_async(dispatch_get_main_queue(), ^{
36                 button.backgroundColor = color;
37                 [button setTitle:[NSStringstringWithFormat:@"%@%@",timeStr,subTitle]forState:UIControlStateNormal];
38                 button.userInteractionEnabled =NO;
39             });
40             timeOut--;
41         }
42     });
43     dispatch_resume(_timer);
44 }