Alexander Farber Alexander Farber - 6 months ago 130
iOS Question

Instead of push segue how to replace view controller (or remove from navigation stack)?

I have a small iPhone app, which uses a navigation controller to display 3 views (here fullscreen):

Xcode screenshot

First it displays a list of social networks (Facebook, Google+, etc.):

list screenshot

Then it displays an OAuth dialog asking for credentials:

login screenshot

And (after that, in same

) for permissions:

permissions screenshot

Finally it displays the last view controller with user details (in the real app this will be the menu, where the multiplayer game can be started):

details screenshot

This all works well, but I have a problem, when the user wants to go back and select another social network:

The user touches the back button and instead of being displayed the first view, is displayed the second one, asking for OAuth credentials/permissions again.

What can I do here? Xcode 5.0.2 shows a very limited choice for segues - push, modal (which I can't use, because it obscures navigation bar needed for my game) and custom.

I am an iOS programming newbie, but earlier I have developed an Adobe AIR mobile app and there it was possible to 1) replace view instead of pushing and 2) remove an unneeded view from navigation stack.

How to do the same in a native app please?


You could use a custom segue: to do it you need to create a class subclassing UIStoryboardSegue (example MyCustomSegue), and then you can override the "perform" with something like this

-(void)perform {
    UIViewController *sourceViewController = (UIViewController*)[self sourceViewController];
    UIViewController *destinationController = (UIViewController*)[self destinationViewController];
    UINavigationController *navigationController = sourceViewController.navigationController;
    // Pop to root view controller (not animated) before pushing
    [navigationController popToRootViewControllerAnimated:NO];
    [navigationController pushViewController:destinationController animated:YES];    

At this point go to Interface Builder, select "custom" segue, and put the name of your class (example MyCustomSegue)