如何为 didReceiveRemoteNotification 生成 Combine Publisher？

Question

我正尝试在 didReceiveRemoteNotification

下生成一个 Combine 发布者

类似于下面的代码：

NotificationCenter.default.publisher(for: UIApplication.willEnterForegroundNotification)

我想使用 SwiftUI Lifecycle 而不想使用 AppDelegate 方法 @UIApplicationDelegateAdaptor

Answer 1

没有名为 didReceiveRemoteNotification 的 Notification，但您可以在 UIApplication 上的扩展中声明它：

extension UIApplication {
    static let didReceiveRemoteNotification = Notification.Name("didReceiveRemoteNotification")
}

然后你需要 post 来自 AppDelegate 的 Notification:

extension AppDelegate {
    
    func application(_ application: UIApplication,
                     didReceiveRemoteNotification userInfo: [AnyHashable : Any],
                     fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {
        
        NotificationCenter.default.post(name: UIApplication.didReceiveRemoteNotification,
                                        object: nil)
        
        // etc...
    }
    
}

这将允许您使用通常的语法：

NotificationCenter.default.publisher(for: UIApplication.didReceiveRemoteNotification)

如何为 didReceiveRemoteNotification 生成 Combine Publisher？

How to generate a Combine Publisher for didReceiveRemoteNotification?

ios

swift

swiftui

combine