SwiftUI iOS app on mac: how to allow smaller window size than (default) iPad equivalent

Question

I have a SwiftUI app originally coded for iOS, that I would like to run at mac as well. I have checked Mac in Deployment info section, but the problem is that the app starts in an iPad-sized window that cannot be resized to a smaller size by user.

I would like to

allow the window to be resized to a smaller than default size
start the app with a smaller window size (that looks like iPhone app running in a window)

I tried adding frame modifier to ContentView like this, but it didn't accomplish anything:

import SwiftUI

@main
struct MyApp: App {
    @Environment(\.scenePhase) var scenePhase

    @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
    @StateObject var appState = AppState()

    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(appState)
                // this is an attempt to start the app at 'iPhone-like' size
                .frame(minWidth: 320, idealWidth: 400, maxWidth: .infinity, minHeight: 480, idealHeight: 480, maxHeight: .infinity)
        }
    }
}

Here are project settings:

@AlejandroIván I've seen this, the second, newer answer (setting a frame on contentview) doesn't do anything for me. I'll see if the first one would help, but really, I'd rather not invoke NSWindow from SwiftUI unless absolutely needed ... — Tomáš Kafka
– Tomáš Kafka, Commented Aug 17, 2021 at 17:19

Lloyd Sargent · Accepted Answer · 2024-06-01 22:55:50Z

0

I had the same problem. I originally wrote it for macOS, then decided to write it for both. Ran perfectly on iOS but couldn’t resize for macOS. I had an example program that worked both for iOS and macOS but COULD resize on macOS. SO I copied Info items until it worked on macOS. Why? Some things on Xcode are a mystery. lol

But it works, so there you go.

I tried Supported iPhone interface orientation then Application Scene Manifest, then Launch Screen (you have to type in UILaunchScreen by hand). The last one is what made it work. However, it may need all three (shrug).

Using Xcode 15.4

NOTE: You must have Portrait AND Upside Down in General set or it doesn’t allow you to resize the macOS view. (Even though it says iPad Orientation)

edited Jun 1, 2024 at 22:55

answered Jun 1, 2024 at 20:50

Lloyd Sargent

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