-(void)startTime{ __block int timeout=30; //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 [l_timeButton setTitle:@"发送验证码" forState:UIControlStateNormal]; l_timeButton.userInteractionEnabled = YES; }); }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); [l_timeButton setTitle:[NSString stringWithFormat:@"%@秒后重新发送",strTime] forState:UIControlStateNormal]; l_timeButton.userInteractionEnabled = NO; }); timeout--; } }); dispatch_resume(_timer); }
GCD 倒计时
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转载自re-reference.iteye.com/blog/2105809
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