问题描述
我正在使用watchOS 7.0和SwiftUI。我的视图监听了NSExtensionHostDidBecomeActive
通知:
.onReceive(NotificationCenter.default.publisher(for: .NSExtensionHostDidBecomeActive)) { _ in
NSLog("Foreground")
viewModel.loadData()
}
但是,它没有被调用。
解决方法
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")
}
然后我能够在SwiftUI视图中收听这些事件:
.onReceive(NotificationCenter.default.publisher(for: .appActivated)) { _ in
viewModel.appActivated()
}
.onReceive(NotificationCenter.default.publisher(for: .appDeactivated)) { _ in
viewModel.appDeactivated()
}