Swift: how to apply "acceptsFirstMouse" for app build with SwiftUI?

Question

Let's imagine that I have an app for MacOS (Catalina).

This app is not hidden. But another app is activated (front of all/ top most)

I want to catch click on the button/any other view (I'm using swiftUI, so everithing is a view) in case of click on my app.

How can I do this?

UPD: how to apply "acceptsFirstMouse" for app build with SwiftUI?

@matt in case of this is impossible, "ubar" cannot exist, but it is exist. As any other "external" and not build-in dock alternative. And such apps HAVE SUCH BEHAVIOR. So.... You're not right. It's possible, but you just don't know how. — Andrew_STOP_RU_WAR_IN_UA, Dec 01 '19 at 21:37
Chill out Andrew, matt is an expert and writing best books on iOS programming and Swift Language. Your question is ambiguous, you should've tagged it with macOS specifically. — Orkhan Alikhanov, Dec 01 '19 at 21:46
So now it's just a duplicate of https://stackoverflow.com/questions/128015/make-osx-application-respond-to-first-mouse-click-when-not-focused and many others. — matt, Dec 01 '19 at 21:47
It is not duplicate because of `SwiftUI` tag. There is no such information for swiftUI on SO and any any other resource. I have checked. — Andrew_STOP_RU_WAR_IN_UA, Dec 01 '19 at 22:26
You are the one who has elected to throw away the yummy goodness of Cocoa and use SwiftUI instead. `acceptsFirstMouse` is Cocoa. — matt, Dec 02 '19 at 01:44

score 4 · Accepted Answer · edited Aug 23 '22 at 14:48

Well, for now there is no such instrument in SwiftUI API, but... it is not standalone in a desert, and Apple did not say that it is a replacement for Cocoa, moreover they show us how to integrate them and use best of both...

So, here is possible approach...

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")
        }
...

Swift: how to apply "acceptsFirstMouse" for app build with SwiftUI?

1 Answers1