Toggle Sidebar in Code using SwiftUI NavigationView on iPad

Question

I'm trying to utilize the built-in sidebar from SwiftUI 2.0 by using NavigationView like this:

NavigationView {
   MainView()
   ListView()
   DetailView()
}.navigationBarHidden(true)

But since I want to use my own Custom Back Button, I've hidden the NavigationBar and tried to toggle the sidebar with code which doesn't work.

self.presentationMode.wrappedValue.dismiss()

I've already seen a lot of solutions for macOS:

NSApp.keyWindow?.firstResponder?.tryToPerform(#selector(NSSplitViewController.toggleSidebar(_:)), with: nil)

But I can't seem to find equivalent for iPad, thanks in advance.

I have a similar problem, link [here](https://stackoverflow.com/q/63971289/9607863). In the end I just decided to make my own custom sidebar, which isn't ideal, but the best solution for me. — George, Oct 21 '20 at 14:21
Thanks, I might as well implement it on my own if I still haven't gotten any solution next week. — ygee, Oct 21 '20 at 14:46

score 4 · Answer 1 · answered Mar 01 '22 at 13:46

I used this code to change the default sidebar settings:

extension UISplitViewController {
    open override func viewDidLoad() {
        super.viewDidLoad()

        self.preferredDisplayMode = .secondaryOnly
        self.preferredSplitBehavior = .overlay
    }
}

self exposes several sidebar methods and properties that can be used. I hope it will be useful!

score 0 · Answer 2 · answered Mar 01 '21 at 19:09

So this is not a good long term solution but if you are like me and 100% needed the native approach to work here's how it can be hacked. Using https://github.com/siteline/SwiftUI-Introspect you can find the right view controller in the hierarchy and set the display mode.

Text("Some View").introspectViewController { vc in
    guard let splitVC = vc.parent?.parent as? UISplitViewController else {
        return
    }

    splitVC.preferredDisplayMode = .oneBesideSecondary
}

This is BRITTLE but it works.

Toggle Sidebar in Code using SwiftUI NavigationView on iPad

2 Answers2