MGTwitterEngine无法在iPad上运行

Question

您好如何在iPad上使用MGTwitterEngine ...

我已经在viewDidLoad上添加了这个代码，但是presentModelViewController没有调用我调试了代码...请让我知道我做错了什么：

- (void)viewDidLoad {
    [super viewDidLoad];

    if(_engine) return;

    _engine = [[SA_OAuthTwitterEngine alloc] initOAuthWithDelegate:self];
    _engine.consumerKey = consumerKeyString;
    _engine.consumerSecret = consumerSecretKeyString;

    UIViewController *controller = [SA_OAuthTwitterController controllerToEnterCredentialsWithTwitterEngine: _engine delegate: self];

    if (controller) 
        [self presentModalViewController: controller animated: YES];
    else {
        tweets = [[NSMutableArray alloc] init];
        [self updateStream:nil];
    }

}

presentModelView是调用但是Twitter登录视图没有被启动..请告诉我谢谢

我正在使用iOS 3.2