인증번호 보내기 카운트다운

__block int timeout = 5; //     
    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); //    
    dispatch_source_set_event_handler(_timer, ^{
        if(timeout<=0){ //     ，  
            dispatch_source_cancel(_timer);
            dispatch_async(dispatch_get_main_queue(), ^{
                //                  
                [button setTitle:title forState:UIControlStateNormal];
                button.userInteractionEnabled = YES;
            });
        } else {
            int seconds = timeout % 60;
            NSString *strTime = [NSString stringWithFormat:@"%.2d", seconds];
            dispatch_async(dispatch_get_main_queue(), ^{
                //                  
                //NSLog(@"____%@",strTime);
                [UIView beginAnimations:nil context:nil];
                [UIView setAnimationDuration:1];
                [button setTitle:[NSString stringWithFormat:@"%@",strTime] forState:UIControlStateNormal];
                [UIView commitAnimations];
                button.userInteractionEnabled = NO;
            });
            timeout--;
        }
    });
    dispatch_resume(_timer);