iOS-是否可以从模式显示的视图控制器中显示模式视图控制器？

我正在开发一个显示“编辑配置文件”屏幕的应用程序。然后从这个屏幕上，我想展示另一个模态视图控制器，UIImagePickerController。但是，我无法执行此操作，并继续收到以下错误：

***由于未捕获的异常“NSInvalidArgumentException”而终止应用程序，原因是：“应用程序试图显示” 模态视图控制器本身。呈现控制器是 UIImagePickerController:0x13d077000。'

在我的应用程序中，在我的个人资料屏幕上，我让右上角的栏按钮项以如下方式显示“编辑个人资料”屏幕：

//  MyProfileViewController.m
// ...

- (void)rightBarButtonItemTapped:(id)sender
{
    EditMyProfileViewController *editMyProfileVC = [[EditMyProfileViewController alloc] init];
    editMyProfileVC.delegate = self;
    UINavigationController *navVC = [[UINavigationController alloc] initWithRootViewController:editMyProfileVC];
    navVC.navigationBar.translucent = NO;
    [self presentViewController:navVC animated:YES completion:^{}];
}

然后，在modally呈现的“edit profile”屏幕的上下文中，我希望能够modally呈现UIImagePickerController。我尝试这样做：

//  EditMyProfileViewController.m
// ...

#pragma mark - UIActionSheetDelegate

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if ([actionSheet isEqual:self.profilePicActionSheet])
    {
        if (buttonIndex == 0) // Camera
        {
            [self.profilePicActionSheet dismissWithClickedButtonIndex:0 animated:YES];
            [self showPhotoPickerUsingSourceType:UIImagePickerControllerSourceTypeCamera];
        }
        if (buttonIndex == 1) // Photo Library
        {
            [self.profilePicActionSheet dismissWithClickedButtonIndex:0 animated:YES];
            [self showPhotoPickerUsingSourceType:UIImagePickerControllerSourceTypePhotoLibrary];
        }
        if (buttonIndex == 2) // Saved Photos Album
        {
            [self.profilePicActionSheet dismissWithClickedButtonIndex:0 animated:YES];
            [self showPhotoPickerUsingSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
        }
    }
}

- (void)showPhotoPickerUsingSourceType:(UIImagePickerControllerSourceType)sourceType
{
    ALAuthorizationStatus status = [ALAssetsLibrary authorizationStatus];
    if (status != ALAuthorizationStatusAuthorized)
    {
        // ...
    }
    else // status == ALAuthorizationStatusAuthorized
    {
        UIImagePickerController *imagePicker = [[UIImagePickerController alloc] initWithRootViewController:self];
        imagePicker.sourceType = sourceType;
        imagePicker.delegate = self;
        imagePicker.allowsEditing = YES;
        if ([UIImagePickerController isSourceTypeAvailable:sourceType])
        {
            [self presentViewController:imagePicker animated:YES completion:^{
                NSLog(@"imagePicker is on screen..."); // <-- App crashes before we get here
            }];
        }
        else
        {
            [Helper helperShowAlertWithTitle:@"Selected Source Type Not Available"];
        }
    }
}

//EditMyProfileViewController.m
// ...
#pragma标记-UIActionSheetDelegate
-（无效）操作表：（UIActionSheet*）操作表单击按钮索引：（NSInteger）按钮索引
{
if（[actionSheet isEqual:self.profilePicActionSheet]）
{
如果（buttonIndex==0）//摄像机
{
[self.profilePicActionSheet Dismiss with Clicked Button索引：0动画：是]；
[自显示PhotoPickerSingSourceType:UIImagePickerControllerSourceTypeCamera]；
}
if（buttonIndex==1）//照片库
{
[self.profilePicActionSheet Dismiss with Clicked Button索引：0动画：是]；
[自显示PhotoPickerSingSourceType:UIImagePickerController源类型PhotoLibrary]；
}
if（buttonIndex==2）//保存的相册照片
{
[self.profilePicActionSheet Dismiss with Clicked Button索引：0动画：是]；
[自显示PhotoPickerSingSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum]；
}
}
}
-（void）ShowPhotoPickerSingSourceType:（UIImagePickerControllerSourceType）sourceType
{
AlaAuthorizationStatus=[ALAssetsLibrary authorizationStatus]；
如果（状态！=ALAuthorizationStatusAuthorized）
{
// ...
}
else//status==ALAuthorizationStatusAuthorized
{
UIImagePickerController*ImagePickerController=[[UIImagePickerController alloc]initWithRootViewController:self]；
imagePicker.sourceType=源类型；
imagePicker.delegate=self；
imagePicker.allowsEditing=是；
if（[UIImagePickerController IsSourceType可用：sourceType]）
{
[self-presentViewController:imagePicker已设置动画：是完成：^{
NSLog（@“imagePicker在屏幕上…”）；更改

UIImagePickerController *imagePicker = [[UIImagePickerController alloc] initWithRootViewController:self];

到

改变

UIImagePickerController *imagePicker = [[UIImagePickerController alloc] initWithRootViewController:self];

到

当您尝试显示图像选择器时，
self
是什么？
self
是模式显示的视图控制器，
EditMyProfileViewController
EditMyProfileViewController
位于
UINavigationController
中，这就是实际显示的内容，如
RightBarButtonItemMapped中所示e> @matt I添加了更多的代码细节。希望这会有所帮助。当您尝试演示图像选择器时，
self
是什么？
self
是模式显示的视图控制器，
EditMyProfileViewController
EditMyProfileViewController
位于
UINavigationController
中，这就是实际显示的视图控制器如
rightbarbuttonimtapped
@matt中所示，我添加了更多的代码详细信息。希望这会有所帮助。捕捉良好。我没有滚动足够的时间来注意到使用了错误的初始值设定项。捕捉良好。我没有滚动足够的时间来注意到使用了错误的初始值设定项。