Ios swift：在UIAlertView中显示推送通知的内容

如何在swift的UIAlertView中显示FCM推送通知的内容

这是没有帮助的，因为它是用于ObjectiveC

我希望在收到推送通知FCM时，向客户端显示带有特定消息的UIAlertView。例如：

如果从FCM接收到的a在UIAlertView中显示特定消息1，否则如果b 从UIAlertView中的FCM显示特定消息2接收

我刚试过这个，但不适合我：

    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)

}

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当您尝试显示警报时，控制台中是否出现任何错误？有时，当从AppDelegate演示内容时，我会看到如下情况：

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!

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…没什么很难为你调试。你有没有在iOS上收到通知？如果手机被锁定，你会在锁屏上收到警报吗？是的…iphone收到了通知…注意UIAlertView已被弃用，你应该改用UIAlertController。我知道…但我的问题是其他的

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