试图提出有关VC，其观点是不是在窗口层次模式的VC

Question

我有一个故事板，看起来像这样：

这是它是如何工作的：InitialSlidingViewController实例导航VC为topViewController如下其.m文件：

-(void)viewDidLoad { 
    [super viewDidLoad]; 

    self.topViewController = [self.storyboard instantiateViewControllerWithIdentifier:@"Navigation"]; 

} 

后导航VC被实例化，它创建的基本功能，并设置为underLeftVC。这是使用ECSlidingViewController。这会创建一个使用平移手势的滑动菜单，与Facebook类似。

NavigationVC的rootVC是我的ItemsCDTVC。当我点击+按钮时，它会弹出一张操作表，让我从相机拍摄照片或从照片库中进行选择。但是，我希望它模式地继续到ManageItemVC并设置我刚刚选择/拍摄到它的UIImageView的图片。当我尝试到现在，它引发以下错误：

Warning: Attempt to present <ManageItemViewController: 0x81d52a0> on <InitialSlidingViewController: 0x8122ce0> whose view is not in the window hierarchy! 

这是真的，因为InitialSlidingVC是不是在屏幕上，ItemCDTVC是，但我要如何解决这个问题？

我已经在我的故事板中设置了模式类型segue，其底部的灵活空间中有一个标识符（当点击时，它没有任何操作，所以我选择了创建视觉轮廓）。这是我在项目CDTVC中的segue代码：

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 
    // let's get the edited image 
    UIImage *image = info[UIImagePickerControllerEditedImage]; 
    // but if for some reason we disable editing in the future, this is our safeguard 
    if(!image) image = info[UIImagePickerControllerOriginalImage]; 
    if(image) { 
     self.pictureImageView.image = image; 
     [self performSegueWithIdentifier:@"addItemSegue" sender:self]; 
    } 
    [self dismissViewControllerAnimated:YES completion:nil]; 
} 

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender 
{ 
    if([segue.identifier isEqualToString:@"addItemSegue"]){ 
     ManageItemViewController *manageItemVC = (ManageItemViewController *)[segue destinationViewController]; 
     manageItemVC.pictureImageView = self.pictureImageView; 
    } 
} 

尝试呈现模态VC时失败。

Answer 1

固定的，我不得不这样做的唯一事情就是尝试执行之前赛格瑞驳回imagePickerController，像这样：

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info 
{ 
    // let's get the edited image 
    UIImage *image = info[UIImagePickerControllerEditedImage]; 
    // but if for some reason we disable editing in the future, this is our safeguard 
    if(!image) image = info[UIImagePickerControllerOriginalImage]; 
    if(image) { 
     self.pictureImage = image; 
     [self dismissViewControllerAnimated:NO completion:^{ 
      [self performSegueWithIdentifier:@"addItemSegue" sender:self]; 
     }]; 
    } 
}