Question

使用swift 3.1在Xcode 8.3上运行

以下是我在AppDelegate.swift中的代码

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    let center = UNUserNotificationCenter.current()

    center.requestAuthorization(options: [.alert, .sound, .badge], completionHandler: { granted, error in
        if granted {
            print("User accept notification。")
        }
        else {
            print("User don't like receive any notification!")
        }
    })

    let content = UNMutableNotificationContent()
    content.title = "Will it rain?"
    content.body = "It never rains in (Southern) California!"
    content.sound = UNNotificationSound.default()

    let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 5, repeats: false)
    let request = UNNotificationRequest(identifier: "local_notification", content: content, trigger: trigger)

    center.add(request)

    return true
}

我在iPhone上构建并运行它，并会显示一条消息，询问我是否希望收到任何通知，然后点击接受。

然后，没有任何事情发生。

我希望它会显示来自当地的通知以及一些文字＆＃34;会下雨＆＃34;就像在我的代码中一样。

Answer 1

您必须让AppDelegate采用UNUserNotificationCenterDelegate

在applicationDidFinishLaunching方法中，添加此center.delegate = self

然后实现此代码：

extension AppDelegate: UNUserNotificationCenterDelegate {
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        completionHandler([.alert])
    }
}

来自Apple Docs：

要响应通知的传递，您必须实现一个委托共享的UNUserNotificationCenter对象。你的代表对象必须符合UNUserNotificationCenterDelegate协议，通知中心用于传递通知信息到你的应用程序。如果您的通知包含，则需要代理人自定义操作。

参考： https://developer.apple.com/library/content/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/SchedulingandHandlingLocalNotifications.html

https://developer.apple.com/reference/usernotifications/unusernotificationcenterdelegate

为什么我无法通过swift 3从iOS本地获取通知？

1 个答案: