将数据从简单NSView传递到SwiftUI视图: Ie event.keyCode案例

import SwiftUI
import Combine

class DataModel: ObservableObject {
    @Published var keyCode: Int = 0
}

import Cocoa
import SwiftUI

class CustomNSView: NSView {
    var dataModel: DataModel
    
    init(dataModel: DataModel) {
        self.dataModel = dataModel
        super.init(frame: .zero)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    override func keyDown(with event: NSEvent) {
        dataModel.keyCode = Int(event.keyCode)
    }
}

struct ContentView: View {
    @EnvironmentObject var dataModel: DataModel
    
    var body: some View {
        Text("Key Code: \(dataModel.keyCode)")
    }
}

import SwiftUI

@main
struct MyApp: App {
    @StateObject private var dataModel = DataModel()
    
    var body: some Scene {
        WindowGroup {
            ContentView()
                .environmentObject(dataModel)
        }
    }
}