ios-objective-c UIAlert button不實現

objective-c UIAlert button不實現

在函數中有一個UIAlert：

- (void)loadJSON
{

    Reachability *networkReachability = [Reachability reachabilityForInternetConnection];
    NetworkStatus networkStatus = [networkReachability currentReachabilityStatus];
    if (networkStatus == NotReachable) {
        dispatch_async(dispatch_get_main_queue(), ^{
            UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Announcement" message: @"No Connection" delegate: nil cancelButtonTitle:@"OK" otherButtonTitles:nil]; [alert show]; [alert release];
        });
    } else {
      //some code
    }
}

在用戶點了OK鍵後應該觸發函數，回調loadJSON 。

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex {
    [self loadJSON];
}

我的最終目標是如果沒有網絡連接，顯示UIAlert，用戶看見信息，點擊Okay，如果還沒有網絡連接，顯示警報。我沒有連上網，警報信息只顯示了一次。

最佳回答：

不要給alertView分配代理：

UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Announcement" 
                                                message: @"No Connection" 
                                               delegate: self 
                                      cancelButtonTitle:@"OK" 
                                      otherButtonTitles:nil]; 
[alert show];
[alert release];