按钮到计时按钮

按钮到计时

一个倒计时按钮扩展

.h文件

    @interface UIButton (CountDown)
    -(void)startTime:(NSInteger )timeout title:(NSString *)tittle waitTittle:(NSString *)waitTittle;
    @end

.m文件

    #import "UIButton+countDown.h"
    
    @implementation UIButton (countDown)
    -(void)startTime:(NSInteger )timeout title:(NSString *)tittle waitTittle:(NSString *)waitTittle{
        __block NSInteger timeOut=timeout; //倒计时时间
        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);
        dispatch_source_set_timer(_timer,dispatch_walltime(NULL, 0),1.0*NSEC_PER_SEC, 0); //每秒执行
        dispatch_source_set_event_handler(_timer, ^{
            if(timeOut<=0){ //倒计时结束，关闭
                dispatch_source_cancel(_timer);
                dispatch_async(dispatch_get_main_queue(), ^{
                    //设置界面的按钮显示 根据自己需求设置
                    [self setTitle:tittle forState:UIControlStateNormal];
                    self.userInteractionEnabled = YES;
                });
            }else{
                //            int minutes = timeout / 60;
                int seconds = timeOut % 60;
                NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];
                dispatch_async(dispatch_get_main_queue(), ^{
                    //设置界面的按钮显示 根据自己需求设置
                    NSLog(@"____%@",strTime);
                    [self setTitle:[NSString stringWithFormat:@"%@%@",strTime,waitTittle] forState:UIControlStateNormal];
                    self.userInteractionEnabled = NO;
                    
                });
                timeOut--;
                
            }
        });
        dispatch_resume(_timer);
        
    }
    @end