【筆記】IOS_超時檢測

NSDate *m_date = [[NSDate alloc] init]; dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ while (YES) { if ([m_date timeIntervalSinceNow] < -5.0) { UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"提示信息" message:@"超時提示" delegate:self cancelButtonTitle:@"確定" otherButtonTitles:nil, nil]; dispatch_async(dispatch_get_main_queue(), ^{ [alertView show]; }); break; } } });