iOS-OC一句话设施UIButton倒计时（获取验证码）

//获取验证码按钮
- (IBAction)getButtonClick:(UIButton *)sender;

#pragma mark - 获取验证码
- (IBAction)getButtonClick:(UIButton *)sender
{
//正常状态下的背景颜色
UIColor *mainColor = [UIColorcolorWithRed:84/255.0green:180/255.0blue:98/255.0alpha:1.0f];
//倒计时状态下的颜色
UIColor *countColor = [UIColorlightGrayColor];
[selfsetTheCountdownButton:sender startWithTime:5title:@"获取验证码"countDownTitle:@"s"mainColor:mainColor countColor:countColor];
}

#pragma mark - button倒计时
- (void)setTheCountdownButton:(UIButton *)button 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(), ^{
button.backgroundColor = mColor;
[button setTitle:titleforState:UIControlStateNormal];
button.userInteractionEnabled =YES;
});
} else {
int seconds = timeOut % 60;
NSString *timeStr = [NSStringstringWithFormat:@"%0.1d", seconds];
dispatch_async(dispatch_get_main_queue(), ^{
button.backgroundColor = color;
[button setTitle:[NSStringstringWithFormat:@"%@%@",timeStr,subTitle]forState:UIControlStateNormal];
button.userInteractionEnabled =NO;
});
timeOut--;
}
});
dispatch_resume(_timer);
}