ios - 向 UIImagepickercontroller 导航栏添加后退按钮

Question

我有一个 UI 图像选择器，它显示在 UI popoverController 中，我需要在 UIimage picker 导航栏上有一个后退按钮，这样我就可以返回到上一个弹出框。

让我详细解释一下。 1)我有一个弹出窗口，我在其中点击并发出通知，这个通知是在我想要这个相机图像选择器弹出窗口的 View Controller 上读取的。以下是我的代码

-(void)registerNotificationForCameraSource
{
 [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(mediaSourceCallback:) name:NOTIFICATION_FOR_CAMERA_SOURCE object:nil];
}

 #pragma mark - Image picker Popover
-(void)mediaSourceCallback:(NSNotification *)notificationObj
   {
 capturedImages = [[NSMutableArray alloc] init];
 pickerObj = [[UIImagePickerController alloc] init];
// [pickerObj setContentSizeForViewInPopover:CGSizeMake(320,480)];
pickerObj.delegate = self;

if ([notificationObj.object isEqualToString:@"UIImagePickerControllerSourceTypeCamera"])
{
    pickerObj.sourceType = UIImagePickerControllerSourceTypeCamera;
    pickerObj.modalPresentationStyle = UIModalPresentationFullScreen;
    pickerObj.showsCameraControls = YES;
     [self presentViewController:pickerObj animated:YES completion:nil];

}
else
{

    [[UINavigationBar appearanceWhenContainedIn:[ApplicationDiscriptionPopupViewController class], nil] setBarTintColor:[UIColor redColor]];

  pickerObj.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc]initWithTitle:@"Back" style:UIBarButtonItemStyleDone target:self action:@selector(imagePickerBackButtonTapped)];

    [pickerObj.navigationController.navigationBar setBarTintColor:[UIColor redColor]];

    [pickerObj setNavigationBarHidden:NO animated:YES];

    //navigationControllerObj = [[UINavigationController alloc] initWithRootViewController:applicationDiscriptionPopupViewControllerObj];


    _popoverControllerObj.popoverContentSize = CGSizeMake(320,480);
    pickerObj.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [pickerObj presentedViewController];
    [_popoverControllerObj setContentViewController:pickerObj animated:YES];
}

}
 -(void)imagePickerBackButtonTapped
 {
 [pickerObj popToViewController:applicationDiscriptionPopupViewControllerObj    animated:YES]; }

pickerObj 是 UI 图像选择器

applicationDiscriptionPopupViewControllerObj 是我之前的弹出 View 的 View Controller 。从我来的地方。现在我想在弹出窗口中返回到这个 View ，当我点击导航栏中的后退按钮时。

但我没有任何导航栏。请帮忙

Answer 1

如果您在 UIViewController 中通过 presentViewController 添加 UIImagePickerController，那么您应该会看到默认导航栏。
你应该实现:

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    UINavigationItem *navBarTopItem;

   // you cannot add a custom back button with native back button look like, so use image over 

   UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"back_arrow.png"]
                                                           style:UIBarButtonItemStyleBordered
                                                          target:self
                                                          action:@selector(backAction)];

    navBarTopItem.title = @"Albums"; // "Camera
    navBarTopItem.leftBarButtonItem = backButton;
}

添加后退按钮操作处理程序

-(void)backAction{
    [self.navigationController popViewControllerAnimated:YES];
}

希望能回答你的问题。