How to set a default/preferred window size for a Mac Catalyst app?

user_13157641 0
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I have an iOS app that I have enabled Catalyst for. One function in the app opens a new window. By default, this window opens very large but I need a way to make it smaller by default. I know you can set windowScene.sizeRestrictions?.minimumSize and .maximumSize, but that then limits the window to my preferred size. I'd like to make it so the window opens a certain size, say 500x800 by default, but can be expanded by the user to whatever they want.

I have tried window?.frame = CGRect(origin: .zero, size: CGSize(width: 500, height: 800)) in the SceneDelegate, but it has no effect.

Visual example: Image showing my goal window size versus the default window size

mac-catalyst swift uikit macos ios
2 Answers

Figured it out, so I'll help anyone with this issue in the future. Set your .maximumSize as your preferred size. Then after setting the window, use DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { to set the .maximumSize again, but this time what you want to be the actual maximum window size.

My full code:

func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        guard let windowScene = (scene as? UIWindowScene) else { return }
        
        #if targetEnvironment(macCatalyst)
        let toolbarDelegate = NewSchoolworkToolbar()
        let toolbar = NSToolbar(identifier: "main")
        windowScene.title = "New Schoolwork"
        if let titlebar = windowScene.titlebar {
            titlebar.toolbar = toolbar
            titlebar.toolbarStyle = .unified
            titlebar.separatorStyle = .shadow
        }
        #endif
        
        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)
            let newClassworkView = NewClassworkTableViewController()
            
            
            windowScene.sizeRestrictions?.minimumSize = CGSize(width: 400, height: 500)
            // This will be your "preferred size"
            windowScene.sizeRestrictions?.maximumSize = CGSize(width: 500, height: 800)
            
            window.rootViewController = newClassworkView
            self.window = window
            window.makeKeyAndVisible()
        }
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
            // This will be your actual size.
            windowScene.sizeRestrictions?.maximumSize = CGSize(width: 9000, height: 9000)
        }
    }
user_131576410

Following Dylan's great tip,

func tidyCatalystWindow() {
    #if targetEnvironment(macCatalyst)
    UIApplication.shared.connectedScenes.compactMap { $0 as? UIWindowScene }
     .forEach { ws in
        ws.sizeRestrictions?.minimumSize = CGSize(width: 500, height:800)
        ws.sizeRestrictions?.maximumSize = CGSize(width: 500, height: 800)
        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
            ws.sizeRestrictions?.maximumSize = CGSize(width: 9000, height: 9000)
        }
    }
    #endif
}

It's that easy.

user_2948840
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