警告：尝试在<MFSideMenuContainerViewController>上呈现其视图不在窗口层次结构中的<UIImagePickerController>

我试图在iOS中加载图片选择器，它在第一次尝试中正常工作，但是当我第二次执行此操作时我有以下警告警告：尝试在<MFSideMenuContainerViewController>上呈现其视图不在窗口层次结构中的<UIImagePickerController>

警告：尝试呈现其视图不在窗口层次结构中！

我采摘图像代码如下

[self startCameraControllerFromViewController:self usingDelegate:self sourceType:UIImagePickerControllerSourceTypePhotoLibrary];

和方法如下startCameraControllerFromViewController

- (BOOL) startCameraControllerFromViewController: (UIView*) controller usingDelegate: (id) delegate sourceType:(UIImagePickerControllerSourceType) sourceType{ 

if (([UIImagePickerController isSourceTypeAvailable: 
     sourceType] == NO) 
    || (delegate == nil) 
    || (controller == nil)) 
{ 
    DLog(@"no is being returned"); 
    return NO; 


} 

if(_delegate != nil &&[ _delegate respondsToSelector:@selector(imagePickerOpened)]){ 

    [_delegate imagePickerOpened]; 
} 

if(cameraUI==nil){ 

    //  [SVProgressHUD showWithStatus:@"Loading"]; 
    [ALERT showLoader]; 

    dispatch_queue_t concurrentQueue=dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); 

    dispatch_async(concurrentQueue, ^{ 
     cameraUI = [[UIImagePickerController alloc] init]; 

     cameraUI.sourceType = sourceType; 

     cameraUI.mediaTypes=cameraUI.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeImage, nil]; 
     cameraUI.allowsEditing = YES; 

     cameraUI.delegate = delegate; 


     dispatch_async(dispatch_get_main_queue(), ^{ 
      [self.window.rootViewController presentModalViewController:cameraUI animated:YES]; 
      //[self presentModalViewController:cameraUI animated:YES ]; 

      [ALERT hideLoader]; 
     }); 


    }); 
} 
else{ 
    cameraUI.sourceType = sourceType; 
    [self.window.rootViewController presentModalViewController:cameraUI animated:YES]; 
    //[self presentModalViewController:cameraUI animated:YES ]; 
} 

return YES;

}

来源

2013-10-23 Shoaib Ahmed