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__block int timeout = 60;//倒計時時間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);//每秒執(zhí)行dispatch_source_set_event_handler(timer, ^{if (timeout <= 0) {dispatch_source_cancel(timer);dispatch_async(dispatch_get_main_queue(), ^{CNSLog(@"獲取驗證碼");self.getVerificationCodeButton.enabled = YES;self.getVerificationCodeLabel.text = @"獲取驗證碼";self.getVerificationCodeLabel.textColor = [UIColor whiteColor];});}else {NSString * strTime = [NSString stringWithFormat:@"請稍等(%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);

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

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轉(zhuǎn)載于:https://www.cnblogs.com/benbenzhu/p/4060402.html

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