iphone - 警告：尝试呈现上其视图不在窗口层次结构中

Question

我在尝试使用以下代码将图像发布到 Twitter 时收到此错误，想不出我在做什么错任何关于如何解决的想法？

- (void)PostToTwitter

    {   
        UIImage* pxImage = [[self GetResultImage] retain];

        TWTweetComposeViewController *twitter = [[[TWTweetComposeViewController alloc] init] autorelease];

        [twitter setInitialText:@"Twitter Pic"];
        [twitter addImage:pxImage];

        FaceAppDelegate* app = (FaceAppDelegate*)[[UIApplication sharedApplication] delegate];
        [app.mainCtrl presentViewController:twitter animated:YES completion:NULL];

        twitter.completionHandler = ^(TWTweetComposeViewControllerResult res)
        {
            if(res == TWTweetComposeViewControllerResultDone)
            {
                UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Success" message:@"You have posted successfully." delegate:self cancelButtonTitle:@"Close" otherButtonTitles: nil];
                [alert show];
                [alert release];
            }
            else if(res == TWTweetComposeViewControllerResultCancelled)
            {
                UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Cancelled" message:@"You have cancelled posting to Twitter." delegate:NULL cancelButtonTitle:@"Close" otherButtonTitles: nil];
                [alert show];
                [alert release];
            }
            [app.mainCtrl dismissModalViewControllerAnimated:YES];
        };

        [pxImage release];

    }

Answer 1

我认为，没有提出您的观点。尝试使用 app.window.rootViewController，而不是属性 mainContr。