Question

我想在另一个类（例如Game1.cs）中使用deviceToken.Description的值。我需要以某种方式将deviceToken.Description保存在Program.cs中，但我不知道如何。我创建了变量MyToken来保存字符串，但是我不知道如何从另一个类访问MyToken。

如何保存deviceToken.Description的值，以便可以在另一个类中使用它？

namespace Pushtest.iOS
{
[Register("AppDelegate")]
class Program : UIApplicationDelegate
{
    private static Game1 game;
    private static string MyToken = "";

    internal static void RunGame()
    {
        game = new Game1();
        game.Run();
    }

    static void Main(string[] args)
    {
        UIApplication.Main(args, null, "AppDelegate");
    }

    public override void FinishedLaunching(UIApplication app)
    {
        global::Xamarin.Forms.Forms.Init();
        if (UIDevice.CurrentDevice.CheckSystemVersion(8, 0))
        {
            var pushSettings = UIUserNotificationSettings.GetSettingsForTypes(
                               UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound,
                               new NSSet());

            UIApplication.SharedApplication.RegisterUserNotificationSettings(pushSettings);
            UIApplication.SharedApplication.RegisterForRemoteNotifications();
        }
        else
        {
            UIRemoteNotificationType notificationTypes = UIRemoteNotificationType.Alert | UIRemoteNotificationType.Badge | UIRemoteNotificationType.Sound;
            UIApplication.SharedApplication.RegisterForRemoteNotificationTypes(notificationTypes);
        }

        RunGame();
    }

    public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
    {
        // Get current device token
        var DeviceToken = deviceToken.Description;
        if (!string.IsNullOrWhiteSpace(DeviceToken))
        {
            DeviceToken = DeviceToken.Trim('<').Trim('>');
        }

        // Get previous device token
        var oldDeviceToken = NSUserDefaults.StandardUserDefaults.StringForKey("PushDeviceToken");

        // Has the token changed?
        if (string.IsNullOrEmpty(oldDeviceToken) || !oldDeviceToken.Equals(DeviceToken))
        {
            //TODO: Put your own logic here to notify your server that the device token has changed/been created!
        }

        MyToken = DeviceToken;

        // Save new device token
        NSUserDefaults.StandardUserDefaults.SetString(DeviceToken, "PushDeviceToken");
    }

    public override void FailedToRegisterForRemoteNotifications(UIApplication application, NSError error)
    {
        new UIAlertView("Error registering push notifications", error.LocalizedDescription, null, "OK", null).Show();
    }
}
}

Answer 1

如果您不想存储大量数据，可以将其存储在属性中，例如：

Application.Current.Properties["MyToken"] = $"{DeviceToken}";

在另一情况下，请通过以下方式使用它：

var token= Application.Current.Properties["MyToken"].ToString();

Answer 2

由于您将DeviceToken的值保存在Program类中：

   NSUserDefaults.StandardUserDefaults.SetString(DeviceToken, "PushDeviceToken");

您可以通过以下方法获取其他类中的值：

   string deviceToken =  NSUserDefaults.StandardUserDefaults.StringForKey("PushDeviceToken");

引用：user-defaults

如何保存字符串并在另一个类中使用它？

2 个答案: