How to Set Minimum Window Size in macOS SwiftUI

Creating an app that adjusts to various screen sizes is essential for a good user experience. This post will discuss setting the minimum window size in a macOS SwiftUI app.

We’ll take inspiration from a dynamic window sizing example but provide a unique explanation focusing on the minimum dimensions.

Code Snippet for Minimum Window Size

Let’s consider the following code snippet for setting a minimum window size. This should be your entry point.

import SwiftUI

@main
struct HelloWorldApp: App {
    var body: some Scene {
        WindowGroup {
            ContentView().frame(minWidth: 400, maxWidth: .infinity, minHeight: 300, maxHeight: .infinity)
        }.windowResizability(.contentSize)
    }
}

Code Explanation

Import SwiftUI

We start by importing SwiftUI, which provides us with all the tools we need for creating the app interface.

import SwiftUI

App Structure

We define an @main structure that represents the main application. This structure conforms to the App protocol.

@main
struct HelloWorldApp: App {

Define the Scene

Within the body, we define a Scene where our application’s main window resides. We use WindowGroup to manage the app’s windows.

var body: some Scene {
        WindowGroup {

Set the Frame

We define the frame dimensions inside ContentView.

ContentView().frame(minWidth: 400, maxWidth: .infinity, minHeight: 300, maxHeight: .infinity)

Here, minWidth and minHeight are set to 400 and 300 respectively. This ensures that the user can’t resize the window below these dimensions. The maxWidth and maxHeight are set to .infinity, letting users enlarge the window as much as they want.

Window Resizability

The .windowResizability(.contentSize) sets how the window will respond to content changes. It restricts the window to resize according to the content size.

.windowResizability(.contentSize)

Setting the minimum window size in a SwiftUI macOS app can be achieved effortlessly with just a few lines of code. This feature ensures a consistent and user-friendly experience, avoiding any UI elements being too cramped or unreadable.