用GCD实现获取验证码效果

来源：互联网发布：工作日志软件编辑：程序博客网时间：2024/06/14 12:19

界面就不说了功能代码如下

    __block int timeout=5; //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
                [_numberBtn setTitle:@"获取验证码" forState:UIControlStateNormal];
                _numberBtn.userInteractionEnabled = YES;
                _numberBtn.backgroundColor = DCS_COLOR_hui_background_color;
            });
        }else{
            //            int minutes = timeout / 60;
            int seconds = timeout % 60;
            NSString *strTime = [NSString stringWithFormat:@"%d", seconds];
            dispatch_async(dispatch_get_main_queue(), ^{
                //设置界面的按钮显示根据自己需求设置
               DCSLog(@"____%@",strTime);
                [_numberBtn setTitle:[NSString stringWithFormat:@"%@秒后重新发送",strTime] forState:UIControlStateNormal];
                _numberBtn.userInteractionEnabled = NO;
                [_numberBtn setBackgroundColor:[UIColor grayColor]];

            });
            timeout--;

        }
    });
    dispatch_resume(_timer);

好了就这吧先

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