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  • ios中关于发送验证码的计时

    1、点击发送验证码,开始计时

    -(void)startTime{
        
        __block int timeout=120; //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.sendAuthCode setTitle:@"发送验证码" forState:UIControlStateNormal];
                    self.sendAuthCode.userInteractionEnabled = YES;
                    self.sendAuthCode.titleLabel.font = [UIFont systemFontOfSize:10];
                });
            }else{
                
                int seconds = timeout % 120;
                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
                    [self.sendAuthCode setTitle:[NSString stringWithFormat:@"%@秒后重发",strTime] forState:UIControlStateNormal];
                    self.sendAuthCode.titleLabel.font = [UIFont systemFontOfSize:10];
                    self.sendAuthCode.userInteractionEnabled = NO;
                    
                });
                timeout--;
                
            }
        });
        dispatch_resume(_timer);
    
        
    }
    
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  • 原文地址:https://www.cnblogs.com/angongIT/p/4160228.html
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