When clicking on a non-active NSWindow button in SwiftUI, the button should handle the mouse event by default instead of the window.

NSView overrides the acceptsFirstMouse (opens new window) method and always returns true. In SwiftUI, add this overridden View to the overlay of the view.

import SwiftUI
import Cocoa

// Just mouse accepter
class MyViewView : NSView {
    override func acceptsFirstMouse(for event: NSEvent?) -> Bool {
        return true
    }
}

// Representable wrapper (bridge to SwiftUI)
struct AcceptingFirstMouse : NSViewRepresentable {
    func makeNSView(context: NSViewRepresentableContext<AcceptingFirstMouse>) -> MyViewView {
        return MyViewView()
    }

    func updateNSView(_ nsView: MyViewView, context: NSViewRepresentableContext<AcceptingFirstMouse>) {
        nsView.setNeedsDisplay(nsView.bounds)
    }

    typealias NSViewType = MyViewView
}

// Usage (somewhere in your SwiftUI view stack)
Text("Click me")
  .padding(20)
  .background(Color.yellow)
  .overlay(AcceptingFirstMouse()) // must be on top (no confuse, it is transparent)
  .onTapGesture {
      print("Label tapped")
  }

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Author: Sintone Li

Article address: https://cleanclip.cc/developer/swiftui-nswindow-inactive-firstmouse/