如何检测WatchOS应用程序何时激活？

How to detect when watchOS application becomes active?(如何检测WatchOS应用程序何时激活？)

问题描述

我使用的是WatchOS 7.0和SwiftUI。我的视图侦听NSExtensionHostDidBecomeActive通知：

.onReceive(NotificationCenter.default.publisher(for: .NSExtensionHostDidBecomeActive)) { _ in
    NSLog("Foreground")
    viewModel.loadData()
}

但是，它未被调用。

推荐答案

我使用WKExtensionDelegate和我自己的通知解决了此问题。

@main
struct ExtensionApp: App {
    @WKExtensionDelegateAdaptor(ExtensionDelegate.self) var appDelegate

    @SceneBuilder var body: some Scene {
        WindowGroup {
            NavigationView {
                MainView()
            }
        }
    }
}

import WatchKit

final class ExtensionDelegate: NSObject, ObservableObject, WKExtensionDelegate {
    func applicationDidFinishLaunching() {
        NSLog("App launched")
    }

    func applicationDidBecomeActive() {
        NSLog("App activated")
        NotificationCenter.default.post(name: .appActivated, object: nil)
    }

    func applicationDidEnterBackground() {
        NSLog("App deactivated")
        NotificationCenter.default.post(name: .appDeactivated, object: nil)
    }
}

import Foundation

extension Notification.Name {
    static let appActivated = Notification.Name("app.activated")
    static let appDeactivated = Notification.Name("app.deactivated")
}

然后我可以在我的SwiftUI视图中收听以下事件：

.onReceive(NotificationCenter.default.publisher(for: .appActivated)) { _ in
    viewModel.appActivated()
}
.onReceive(NotificationCenter.default.publisher(for: .appDeactivated)) { _ in
    viewModel.appDeactivated()
}

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