swiftui - 如何在 Apple Watch 的扩展委托(delegate)中访问 SwiftUI 内容 View ？

Question

当应用程序激活时，我需要在我的 ContentView 中调用 loadData。 ExtensionDelegate 是一个处理应用程序事件的类，例如 applicationDidBecomeActive。但是我不明白如何在 ExtensionDelegate 中获取 ContentView。

这是我的ContentView:

struct ContentView: View {

    let network = Network()

    @State private var currentIndex: Int = 0
    @State private var sources: [Source] = []

    var body: some View {
        ZStack {
            // Some view depends on 'sources'
        }
        .onAppear(perform: loadData)
    }

    func loadData() {
        network.getSources { response in
            switch response {
            case .result(let result):
                self.sources = result.results

            case .error(let error):
                print(error)
            }
        }
    }

}

和ExtensionDelegate:

class ExtensionDelegate: NSObject, WKExtensionDelegate {

    func applicationDidFinishLaunching() {

    }

    func applicationDidBecomeActive() {
        // Here I need to call 'loadData' of my ContentView
    }

    func applicationWillResignActive() {
    }
...

Answer 1

我认为最简单的解决方案是使用通知

在 ContentView 中

let needsReloadNotification = NotificationCenter.default.publisher(for: .needsNetworkReload)

var body: some View {
    ZStack {
        // Some view depends on 'sources'
    }
    .onAppear(perform: loadData)
    .onReceive(needsReloadNotification) { _ in self.loadData()}
}

并且在 ExtensionDelegate

func applicationDidBecomeActive() {
    NotificationCenter.default.post(name: .needsNetworkReload, object: nil)
}

和共享的某处

extension Notification.Name {
    static let needsNetworkReload = Notification.Name("NeedsReload")
}