SwiftUI MacCatalyst的isMovableByWindowBackground

Question

如何从NSWindow中访问SwiftUI Catalyst应用程序的属性？例如，通过通过NSWindow.moveableByWindowBackground拖动其背景来允许移动窗口。

我已经在SceneDelegate.swift中指定了基础知识。

import UIKit
import SwiftUI

class SceneDelegate: UIResponder, UIWindowSceneDelegate {

    var window: UIWindow?

    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {

        let app = UIApplication.shared
        let delegate = app.delegate as! AppDelegate
        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)

            #if targetEnvironment(macCatalyst)
            if let titlebar = windowScene.titlebar {
                titlebar.titleVisibility = .hidden
                titlebar.toolbar = nil
            }
            if let sizeRestrictions = windowScene.sizeRestrictions {
                sizeRestrictions.minimumSize = CGSize(width: 1300, height: 800)
            }
            window.canResizeToFitContent = true
            #endif

            window.rootViewController = UIHostingController(rootView: GreatHallView(screenerVM: delegate.screenerVM).environmentObject(SortingHat()))
            self.window = window
            window.makeKeyAndVisible()
        }
    }

Answer 1

首先，您需要Mhd Hejazi的动态 library。可以使用SPM将其包含在您的代码中。

接下来，是UIWindow的扩展：

    extension UIWindow {
        var nsWindow: NSObject? {
            Dynamic.NSApplication.sharedApplication.delegate.hostWindowForUIWindow(self)
        }
    }

现在您可以将NSWindow与UIWindow关联并调用方法并按如下所示提取属性：

    #if targetEnvironment(macCatalyst)
    let ns = window.nsWindow
    let frame = ns?.value(forKey: "frame")
    let size = (frame as! CGRect).size
    ns!.setValue(CGSize(1.0, size.height/size.width), forKey: "aspectRatio")
    print(Dynamic(ns!).isMovableByWindowBackground.asBool!)
    Dynamic(ns!).setMovableByWindowBackground(true)
    print(Dynamic(ns!).isMovableByWindowBackground.asBool!)
    #endif

记住需要导入动态