btn倒计时 （CountDown）

#import "UIButton+CountDown.h"

@implementationUIButton (CountDown)

- (void)startWithTime:(NSInteger)timeLine title:(NSString *)title countDownTitle:(NSString *)subTitle mainColor:(UIColor *)mColor countColor:(UIColor *)color {

    // 倒计时时间

    __blockNSInteger 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) {

            NSLog(@" ---------- ");

            dispatch_source_cancel(_timer);

            dispatch_async(dispatch_get_main_queue(), ^{

                self.backgroundColor = mColor;

                [selfsetTitle:title forState:UIControlStateNormal];

                self.userInteractionEnabled =YES;

            });

        }else{

            NSLog(@" +++++++++++ ");

            if(timeOut >=60) {

                timeOut = timeOut %60+60;

            }else{

                timeOut = timeOut;

            }

            intseconds = (int)timeOut;

            NSString * timeStr = [NSString stringWithFormat:@"%0.2d", seconds];

            dispatch_async(dispatch_get_main_queue(), ^{

                self.backgroundColor = color;

                [selfsetTitle:[NSString stringWithFormat:@"%@%@", timeStr, subTitle] forState:UIControlStateNormal];

                self.userInteractionEnabled =NO;

            });

            timeOut--;

        }

    });

    dispatch_resume(_timer);

}

@end

----------------------------------------------------