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 - }