CODEWITHSUNDEEP
iosobjective-ciphoneuisplitviewcontroller
SFF
SFF

Reputation: 877

UISplitViewController - dismiss / pop Detail View Controller in code in collapsed mode

Since iOS8 we're allowed to use UISplitViewController on both compact and regular devices. This is great because I don't have to create two different storyboard for iPhone and iPad, but there's one problem that I'm stuck with.

If the split view controller is on iPad(if the collapsed property is NO), I can simply call this to show MasterVC on the left side.

self.splitViewController.preferredDisplayMode = UISplitViewControllerDisplayModePrimaryOverlay;
[self.splitViewController.displayModeButtonItem action];

But if it's on iPhone(if the collapsed property is YES), the displayMode is ignored, and doesn't do anything.

I cannot pop DetailVC with popToRootViewControllerAnimated because DetailVC has it's own navigation controller.

How does Apple expect us to show MasterVC(dismiss DetailVC) in code in collapsed mode if there isn't any method like dismissViewControllerAnimated:completion: for view controller that was presented with showDetail? Your help will be appreciated. Thanks

Upvotes: 12

Views: 12483

Answers (4)

Cody
Cody

Reputation: 850

Here's what I ended up doing to pop the DetailVC if we are in a collapsed state (iPhone excluding +sizes), and show/hide the MasterVC if we are not in a collapsed state (iPad).

@IBAction func backTouchUp(_ sender: UIButton) {
    if let splitViewController = splitViewController,
        !splitViewController.isCollapsed {
        UIApplication.shared.sendAction(splitViewController.displayModeButtonItem.action!, to: splitViewController.displayModeButtonItem.target, from: nil, for: nil)
    } else {
        navigationController?.popViewController(animated: true)
    }
}

Upvotes: 2

Scott Gardner
Scott Gardner

Reputation: 8739

Thanks pNre! Here's code that will handle displaying a custom back button when collapsed and the displayModeButton when not collapsed.

lazy var backButtonItem: UIBarButtonItem = {
    UIBarButtonItem(image: UIImage(named: "backImage"), style: .plain, target: self, action: #selector(dismissAnimated))
}()

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()

    guard let svc = splitViewController else { return }

    if svc.isCollapsed {
        navigationItem.leftBarButtonItem = backButtonItem
    } else {
        navigationItem.leftBarButtonItem = svc.displayModeButtonItem
    }
}

func dismissAnimated() {
    _ = navigationController?.navigationController?.popViewController(animated: true)
}

I've placed this in willLayoutSubviews() instead of viewDidLoad() so that the button will be updated adaptively, e.g., for orientation changes on iPhone 7 Plus and size class changes such as while in split view on iPad.

Upvotes: 0

CocoaEv
CocoaEv

Reputation: 2984

Had a similar issue today trying to pop back from a detail view in a split view controller.

While I'm sure the accepted answer works fine, another approach I found that works as well and may be a bit cleaner is to use an unwind segue.

I setup an unwind segue on the master view I wanted to return to, then created a segue link to the unwind segue from the view I wanted to pop (note: assumes that you are using storyboards).

Make sure to setup the IBAction on the destination view you are popping back to:

-(IBAction)prepareForUnwind:(UIStoryboardSegue *)segue { }

Connect the exit to the segue in the storyboard for the unwind segue. Sorry, I'm not providing a lot of detail on how to setup the unwind segue, but there are many tutorials available for that.

Then on your controller you want to dismiss, connect a segue to the unwind segue of the controller you are popping back to. Be sure to name the segue.

Then on the button touch in the view controller you want to dismiss, just call 

[self performSegueWithIdentifier:@"unwindSegueName" sender:self];

This worked really well and avoids digging backwards into a navigation hierarchy that may change.

Hope this is useful to someone! Happy Holidays!

Upvotes: 6

pNre
pNre

Reputation: 5376

On devices which don't support the "split" mode, if

  1. You want to present the master view controller instead of the detail when the UISplitViewController first loads, then returning YES in your delegate class (UISplitViewControllerDelegate) splitViewController:collapseSecondaryViewController:ontoPrimaryViewController: method method should do that:

    - (BOOL)splitViewController:(UISplitViewController *)splitViewController collapseSecondaryViewController:(UIViewController *)secondaryViewController ontoPrimaryViewController:(UIViewController *)primaryViewController {
    return YES;
}

  2. You want to dismiss the detail view controller back to the master, after a specific event (e.g. a touch on a button). In this case you have to pop the detail view controller navigation controller:

    [detailViewController.navigationController.navigationController popToRootViewControllerAnimated:YES]

Upvotes: 24

Related Questions