Tom Foutz Tom Foutz - 24 days ago 18
iOS Question

Open UISplitViewController to Master View rather than Detail

I have a split-view interface with a target iPhone 6 application. On the first launch of the application, it opens to the Detail View; I would like it to open to the Master View. I have tried:

self.splitViewController?.preferredDisplayMode = UISplitViewControllerDisplayMode.PrimaryOverlay


Which was suggested elsewhere (Prior StackOverFlow Question) but it doesn't seem to do anything, and does not open the Master view on launch. I also tried to add the following line to my AppDelegate:

splitViewController:collapseSecondaryViewController:ontoPrimaryViewController:


But despite returning true or false (Another Prior Stack Overflow Question) I had no success.

I did launch up the example Master-Detail application in Xcode, and it loads to the Master view based on the splitViewController: call returning false; however, I'm not sure how to make this work in a more complicated layout.

Answer

Swift

UISplitViewController display master view above detail in portrait orientation is not about showing the Master view, it is about presenting the Detail view in full width, underneath the Master view.

UISplitViewController in portrait on iPhone shows detail VC instead of master is about the principle of the collapse mechanism.

This present answer addresses:

  • Master->Detail (Compact width) iPhone 4s, 5, 5s, 6, iPhone 6 Plus in portrait
  • side-by-side (all other sizes) iPad, iPhone 6 Plus in landscape

You must set preferredDisplayMode. You would want is .PrimaryVisible if it existed! Using .AllVisible, iOS picks Detail if only 1 view fits (Compact width); in that size, the code below will pick Master.

The trick is to change both the preferredDisplayMode to AllVisible and to return true in collapseSecondaryViewController:ontoPrimaryViewController.

class PrimarySplitViewController: UISplitViewController, UISplitViewControllerDelegate {

    override func viewDidLoad() {
        self.delegate = self
        self.preferredDisplayMode = .AllVisible
    }

    func splitViewController(splitViewController: UISplitViewController, collapseSecondaryViewController secondaryViewController: UIViewController!, ontoPrimaryViewController primaryViewController: UIViewController!) -> Bool {
        // Return YES to prevent UIKit from applying its default behavior
        return true 
    }
}
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