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  • iOS验证码倒计时(GCD实现)

    + (void)verificationCode:(void(^)())blockYes blockNo:(void(^)(id time))blockNo {
        __block int timeout=60; //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
                    blockYes();
                });
            }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);
                    blockNo(strTime);
                    
                });
                timeout--;
            }
        });
        dispatch_resume(_timer);
    }
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  • 原文地址:https://www.cnblogs.com/hxwj/p/4528550.html
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