如何检测 watchOS 应用程序何时激活？

Question

我正在使用 watchOS 7.0 和 SwiftUI。我的视图监听 NSExtensionHostDidBecomeActive 通知：

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

然而，它并没有被调用。

Answer 1

我使用 WKExtensionDelegate 和我自己的通知解决了这个问题。

@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")
}

然后我就可以在我的 SwiftUI 视图中收听这些事件了：

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

如何检测 watchOS 应用程序何时激活？

How to detect when watchOS application becomes active?

ios

watchkit

watchos

swiftui