swift：在UIAlertView中显示推送通知的内容-Java 学习之路

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如何在swift中的UIAlertView中显示推送通知（FCM）的内容？

这link没有帮助，因为它是针对ObjectiveC ...

我希望在收到推送通知（FCM）时向客户端显示具有特定消息的UIAlertView . 例如：

如果（从FCM收到“a”）在UIAlertView中显示“特定消息1”，否则如果（从FCM收到“b”）在UIAlertView中显示“特定消息2” .

我刚试过这个，但它对我不起作用：

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {


        // display alert view when notification is received !!!
        let alertController = UIAlertController(title: "Alert", message: "you have a new notification", preferredStyle: .alert)
        let okAction = UIAlertAction(title: "Yes", style: UIAlertActionStyle.default) {
            UIAlertAction in
            NSLog("OK Pressed")
        }
        let cancelAction = UIAlertAction(title: "No", style: UIAlertActionStyle.cancel) {
            UIAlertAction in
            NSLog("Cancel Pressed")
        }
        alertController.addAction(okAction)
        alertController.addAction(cancelAction)
        self.window?.rootViewController?.present(alertController, animated: true, completion: nil)

}

1 回答

当您尝试显示警报时，是否在控制台中出现任何错误？有时当我从 AppDelegate 展示东西时，我看到这样的东西：

2017-01-01 16:04:14.806 wylt[46457:5781064] Warning: Attempt to present <UIAlertController: 0x7faf13f0a910> on <wylt.WYLTNavigationViewController: 0x7faf1402e200> whose view is not in the window hierarchy!

我更喜欢找到顶视图控制器并从那里显示警报......但是将调用存在于异步块中也对我有用 .

DispatchQueue.main.async {
    self.window?.rootViewController?.present(alertController, animated: true, completion: nil)
}

回复于 2024-04-29T11:37:16+08:00

swift：在UIAlertView中显示推送通知的内容

1 回答

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