Loading...

How to open a new window in SwiftUI?

question swift swiftui
Ram Patra Published on May 29, 2022

Although many things in SwiftUI are idiomatic and straightforward, showing your view in a new window needs a bit of coding to do. Hence, this short post.

First, let’s create a Window Controller that will hold your window/view:

import AppKit
import SwiftUI

class WindowController<RootView: View>: NSWindowController {
    convenience init(rootView: RootView) {
        let hostingController = NSHostingController(rootView: rootView.frame(width: 400, height: 400))
        let window = NSWindow(contentViewController: hostingController)
        window.setContentSize(NSSize(width: 400, height: 400))
        self.init(window: window)
    }
}

What we’re doing here is creating a Hosting Controller (which is a subclass of View Controller) that takes your supplied View, does its magic, and then gives it to NSWindow.

Now, let’s create two Views in SwiftUI, Parent and Child, like below:

import SwiftUI

struct NewWindowParentView: View {
    @State private var windowCount = 1
    
    var body: some View {
        Button("Show new window") {
            let windowController = WindowController(rootView: NewWindowChildView())
            windowController.window?.title = "Child Window \(windowCount)"
            windowCount += 1
            windowController.showWindow(nil)
        }
    }
}
import SwiftUI

struct NewWindowChildView: View {
    var body: some View {
        Text("Child view")
    }
}

Parent View resemble whatever your main View in your app is and the Child View is the View that you want to show in a new Window.

That’s it. So, when you open the Parent View, you will see a Button and every time you press this button, a new Window will be created showing your Child View.

Lastly, the entire example code can be found on GitHub.

Ram Patra Published on May 29, 2022
Image placeholder

Keep reading

If this article was helpful, others might be too

question swift March 14, 2021 How to generate a random number in Swift?

You can use the random method in Int struct for this.

question macOS swift November 10, 2021 How to detect fn key press in Swift?

You can override the flagsChanged() method of NSViewController and have your code like below to detect fn key press and release in macOS:

question macOS swift August 14, 2020 How to detect Delete key press in Swift?

Delete key press detection is slightly different than other keys. It uses NSDeleteCharacter like below: