7.5 60秒倒计时

//发送验证码事件

-(void)countDownAction{

__block int timeout=59; //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（倒计时结束后调用）

[self.countDownBtn setTitle:@"发送验证码" forState:UIControlStateNormal];

[self.countDownBtn setTitleColor:[UIColor colorWithHexString:@"f2f2f2"] forState:UIControlStateNormal];

//设置不可点击

self.countDownBtn.userInteractionEnabled = YES;

self.countDownBtn.backgroundColor = [UIColor colorWithHexString:mainColor];

});

}else{

//            int minutes = timeout / 60;    //这里注释掉了，这个是用来测试多于60秒时计算分钟的。

int seconds = timeout % 60;

NSString *strTime = [NSString stringWithFormat:@"%d", seconds];//倒计时的秒数显示

dispatch_async(dispatch_get_main_queue(), ^{

//设置界面的按钮显示 根据自己需求设置

[self.countDownBtn setTitle:[NSString stringWithFormat:@"%@秒重新发送",strTime] forState:UIControlStateNormal];

[self.countDownBtn setTitleColor:[UIColor colorWithHexString:@"999999"] forState:UIControlStateNormal];

//设置可点击

self.countDownBtn.userInteractionEnabled = NO;

self.countDownBtn.backgroundColor = [UIColor colorWithHexString:@"e6e6e6"];

});

timeout--;

}

});

dispatch_resume(_timer);

}