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SwiftUI macOs AppDelegate检测ObservedObject的更改

observableobject appkit appdelegate macos swift

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Paul · 技术社区 · 5 年前

我有以下内容 AppDelegate 类,我想确定何时 userPreferences.backgroundIsTransparent 更改状态,必须调用内部的函数 AppDelegate .

我看了一眼: https://stackoverflow.com/a/58431723/8024296

但我不知道如何在我的情况下使用它。

我该怎么办?

AppDelegate:

import Cocoa
import SwiftUI

@main
class AppDelegate: NSObject, NSApplicationDelegate {
    var popover = NSPopover.init()
    var statusBar: StatusBarController?
    @Environment(\.colorScheme) var colorScheme
    
    @ObservedObject var userPreferences = UserPreferences.instance
    
    func applicationDidFinishLaunching(_ aNotification: Notification) {
        let contentView = ContentView()
        popover.contentSize = NSSize(width: 560, height: 360)
        popover.contentViewController = NSHostingController(rootView: contentView)
        statusBar = StatusBarController.init(popover)
        DistributedNotificationCenter.default.addObserver(self, selector: #selector(interfaceModeChanged(sender:)), name: NSNotification.Name(rawValue: "AppleInterfaceThemeChangedNotification"), object: nil)
    }
    
    func applicationWillTerminate(_ aNotification: Notification) {
        // Insert code here to tear down your application
    }
    
    @objc func interfaceModeChanged(sender: NSNotification) {
        //popover.backgroundColor = colorScheme == .dark ? #colorLiteral(red: 0.3411764801, green: 0.6235294342, blue: 0.1686274558, alpha: 1) : #colorLiteral(red: 0.2392156869, green: 0.6745098233, blue: 0.9686274529, alpha: 1)
        popover.backgroundColor = NSColor(named: "backgroundTheme")?.withAlphaComponent(userPreferences.backgroundIsTransparent ? 0.3 : 1.0)
        print("change", colorScheme)
    }
}

import EventKit
import ServiceManagement

private struct PreferencesKeys {
    static let backgroundIsTransparent = "backgroundIsTransparent"
    static let isDarkMode = "isDarkMode"
}

class UserPreferences: ObservableObject {
    static let instance = UserPreferences()
    
    private init() {
        // This prevents others from using the default '()' initializer for this class.
    }
    
    private static let defaults = UserDefaults.standard
    
    @Published var backgroundIsTransparent: Bool = {
        guard UserDefaults.standard.object(forKey: PreferencesKeys.backgroundIsTransparent) != nil else {
            return true
        }
        return UserDefaults.standard.bool(forKey: PreferencesKeys.backgroundIsTransparent)
    }() {
        didSet {
            UserPreferences.defaults.set(backgroundIsTransparent, forKey: PreferencesKeys.backgroundIsTransparent)
        }
    }
    
    @Published var isDarkMode: Bool = {
        guard UserDefaults.standard.object(forKey: PreferencesKeys.isDarkMode) != nil else {
            return true
        }
        return UserDefaults.standard.bool(forKey: PreferencesKeys.isDarkMode)
    }() {
        didSet {
            UserPreferences.defaults.set(isDarkMode, forKey: PreferencesKeys.isDarkMode)
        }
    }
    
}

0 回复 | 直到 5 年前

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2

vadian 5 年前

有一种更复杂的观察方式 UserDefaults .

这个 Combine 框架为 用户默认值 ,实际上是一个 关键价值观察出版商

首先让你 backgroundIsTransparent 属性的扩展 用户默认值

extension UserDefaults {
    @objc var backgroundIsTransparent: Bool {
        get {
            guard object(forKey: PreferencesKeys.backgroundIsTransparent) != nil else { return true }
            return bool(forKey: PreferencesKeys.backgroundIsTransparent)
        }
        set {
            set(newValue, forKey: PreferencesKeys.backgroundIsTransparent)
        }
    }
}

在AppDelegate中导入 结合 并创建 Set 订阅的

import Combine

@main
class AppDelegate: NSObject, NSApplicationDelegate { ...

    private var subscriptions = Set<AnyCancellable>()

和在 applicationDidFinishLaunching 添加发布者

    func applicationDidFinishLaunching(_ aNotification: Notification) {

    // .....

        UserDefaults.standard.publisher(for: \.backgroundIsTransparent)
            .sink { state in
                print(state)
                // do something with state
            }
            .store(in: &subscriptions)
    }

使用您的方法的另一种选择是 userPreferences 一 @StateObject

@StateObject var userPreferences = UserPreferences.instance

并观察 背景是透明的

userPreferences.$backgroundIsTransparent
.sink { state in
   print(state)
   // do something with state
}
.store(in: &subscriptions)