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  • ios 使用gcd 显示倒计时

     __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),NSEC_PER_SEC * 1.0 , 0);//每秒执行
        dispatch_source_set_event_handler(timer, ^{
            if (timeout <= 0) {
    
                dispatch_source_cancel(timer);
                dispatch_async(dispatch_get_main_queue(), ^{
                    CNSLog(@"获取验证码");
                    self.getVerificationCodeButton.enabled = YES;
                    self.getVerificationCodeLabel.text = @"获取验证码";
                    self.getVerificationCodeLabel.textColor = [UIColor whiteColor];
                });
            }
            else {
                
                NSString * strTime = [NSString stringWithFormat:@"请稍等(%d秒)",timeout];
                dispatch_async(dispatch_get_main_queue(), ^{
                    CNSLog(@"timeout = %d",timeout);
                    
                    self.getVerificationCodeButton.enabled = NO;
                    self.getVerificationCodeLabel.textColor = UIColorFromRGB(0xe6e6e6);
                    self.getVerificationCodeLabel.text = strTime;
                    
    
                });
                timeout -- ;
            }
        });
        
        dispatch_resume(timer);

    原文:http://blog.csdn.net/fanxun1982/article/details/8678362

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  • 原文地址:https://www.cnblogs.com/benbenzhu/p/4060402.html
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