调整UINavigationController ViewControllers NSArray的顺序

Question

I want to start my app with a 'HomeScreen' that (amongst some other options) displays a button to choose an image and to resume editing with some image from a previous session.

• Button: Pick
• Button: Edit

When choosing "Edit" it will bring the user to an edit view, using Navigation controllers etc. fine so far When choosing "Pick" it will show the iOS imagePickerController etc.

but, after selecting an image, I do not want to return to the 'HomeScreen'. When the UIImagePickerController is being dismissed, it will need to 'uncover' the "Edit" view, as if it had been inserted into the 'ViewControllers NSArray', just below the UIImagePickerController.

The 'Back' button in the 'Edit' stage will ALWAYS bring the user back to the 'HomeScreen', so even if one had entered this screen through the imagePicker, it still will have to return to the 'HomeScreen'

One of the reasons that the 'HomeScreen' needs to be the back button, is the the app will be FREE app, but at the HomeScreen will be the option to do IAP to unlock more features and more like the 'About' etc...

So... how can I tweak the order of the Navigation Controller

or are there better ways to go from A to B to C and back to A (or from A to C and back to A)

Answer 1

Add a Bar Button Item on the top left hand side of the scene for 'C' (this will override the back button that automatically gets placed there).

Next create an IBAction for that button that does something like this:

- (IBAction)goToA:(id)sender {
    [self.navigationController popToRootViewControllerAnimated:YES];
} 

Answer 2

inside homeViewController.m it was just a matter of setting up the right things for the segues: dragged in a viewController and wired it up to the 'Edit'-button, InterfaceBuilder creates the segue and gave it the identifier presentImageEditorViewController . Then as usual, setup the segues in the implementation file (for convenient, I skipped the part of setting up the imagePicker etc).

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
    if ([segue.identifier isEqualToString:@"presentImagePickerController"]) {
        [segue.destinationViewController setDelegate:self];
        NSLog(@"Presenting ImagePickerController");
    }
    else if ([segue.identifier isEqualToString:@"presentImageEditorViewController"]) {
        NSLog(@"Presenting ImageEditorController");
    }
}

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSLog(@"Picked some image");
    [self performSegueWithIdentifier:@"presentImageEditorViewController" sender:self];
    [self dismissViewControllerAnimated:YES completion:nil];
}

At the time of selecting an image in the imagePicker, it calls the delegate methode didFinish… and simply setup the segue to the ImageEditorVieController and then dismisses the ImagePickerController , the back button will be just fine in the imageEditor navigationBar