Xamarin IOS:当应用程序不在后台时如何处理通知点击?(被杀状态)

Question

我已经使用Firebase Cloud Messaging在我的xamarin表单项目(聊天应用程序)上实现了推送通知。在所有状态下都收到通知，点击通知时，我需要显示相应的消息列表页面。

当应用处于前台和后台模式时，通知点击工作。但是当应用程序不在后台(已终止状态)时，点击不起作用。使用DidReceiveRemoteNotification，我正在处理应用程序处于后台状态时的通知点击。使用WillPresentNotification和DidReceiveNotificationResponse我在前台模式下显示通知并处理通知点击。下面添加的代码：

//Notification tapping when the app is in background mode.
public override void DidReceiveRemoteNotification(UIApplication application, NSDictionary userInfo, Action<UIBackgroundFetchResult> completionHandler)
{
HandleMessage(userInfo);
// Print full message.
LogInformation(nameof(DidReceiveRemoteNotification), userInfo);
completionHandler(UIBackgroundFetchResult.NewData);
var myData = JsonConvert.DeserializeObject<List<webContentList>>(userInfo[new NSString("webContentList")] as NSString);
Console.WriteLine($"myData received: {myData}");
if (UIApplication.SharedApplication.ApplicationState.Equals(UIApplicationState.Active))
{
//App is in foreground, no action
}
else
{
MessagingCenter.Send<object, List<webContentList>>(this, "messagedata", myData);
}
}
//Showing the notification when the app is in the foreground mode.
[Export("userNotificationCenter:willPresentNotification:withCompletionHandler:")]
public void WillPresentNotification(UNUserNotificationCenter center, UNNotification notification,
Action<UNNotificationPresentationOptions> completionHandler)
{
completionHandler(UNNotificationPresentationOptions.Sound | UNNotificationPresentationOptions.Alert);
}
//Notification tapping when the app is in the foreground mode.
[Export("userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler:")]
public void DidReceiveNotificationResponse(UNUserNotificationCenter center, UNNotificationResponse response, Action
completionHandler)
{
completionHandler();
NSDictionary userInfo = response.Notification.Request.Content.UserInfo;
var myData = JsonConvert.DeserializeObject<List<webContentList>>(userInfo[new NSString("webContentList")] as NSString);
Console.WriteLine($"myData received: {myData}");
MessagingCenter.Send<object, List<webContentList>>(this, "messagedata", myData);
}

已完成启动

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
LoadApplication(new App());
#region Push Notification            
Firebase.Core.App.Configure();
// Register your app for remote notifications.
if (UIDevice.CurrentDevice.CheckSystemVersion(10, 0))
{
// iOS 10 or later
var authOptions = UNAuthorizationOptions.Alert | UNAuthorizationOptions.Badge | UNAuthorizationOptions.Sound;
UNUserNotificationCenter.Current.RequestAuthorization(authOptions, (granted, error) => {
Console.WriteLine(granted);
});
// For iOS 10 display notification (sent via APNS)
UNUserNotificationCenter.Current.Delegate = this;
// For iOS 10 data message (sent via FCM)
//Messaging.SharedInstance.RemoteMessageDelegate = this;
}
else
{
// iOS 9 or before
var allNotificationTypes = UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound;
var settings = UIUserNotificationSettings.GetSettingsForTypes(allNotificationTypes, null);
UIApplication.SharedApplication.RegisterUserNotificationSettings(settings);
}
UIApplication.SharedApplication.RegisterForRemoteNotifications();
Messaging.SharedInstance.Delegate = this;
Messaging.SharedInstance.ShouldEstablishDirectChannel = true;
#endregion
return base.FinishedLaunching(app, options);
}

我的通知正文：webContentList是我的模型数据。

{
"to" : "dmtfiSvBBM0:APA91bFnHkamMSYgxPuiSfdvKnU8hD_mOqrWijnENNgXVSkSgo1ILH3-uKVCU7Ez2PXXOhtDoobIyKBf5UshVfTmvjSqHgXMRTsqguKCSTjIfGnXrVP-_cNFq2sisshZO-BcfkwKTl-I",
"collapse_key" : "type_a",
"notification" : {
"body" : "This is body",
"title": "Tech Team",
"priority":"high",
"content_available":true
},
"data" : {
"webContentList": [
{
"webContentDefinitionId": 818084,
"pageTitle": "CCD Grade 3-4",
"pageKwd": "CCD Grade 3-4",
"pageDesc": "CCD Grade 3-4",
"siteId": 45,
"pageCreatedTime": 1555145959428,
"pageUpdatedDate": 1555927274279,
"modifier": {
"userId": 12944,
"applicationId": 32,
"username": "robert.downey",
"email": "[e-mail]",
"firstName": "Robert",
"lastName": "Downey"
},
"creator": {
"userId": 12944,
"applicationId": 32,
"username": "robert.downey",
"email": "[e-mail]",
"firstName": "Robert",
"lastName": "Downey"
}
}
]
},
"ttl": 3600
}

问题

当应用处于终止状态时，仅加载主页，而不显示消息列表页面。但在 UI 中显示主页之前，UI 中还存在消息列表显示进度(acr 用户对话框)。所以我认为LoadApplication(new App());在应用程序处于死亡状态时，FinishedLaunching中的在通知点击功能之后工作。那么，当应用程序处于终止状态时，如何停止执行正常的应用程序启动代码并显示消息列表页面呢？

更新

像下面这样尝试。初始启动很好，但是通过通知点击启动时崩溃。

LoadApplication(new App());
if (options != null)
{
var myData = JsonConvert.DeserializeObject<List<webContentList>>(options[new NSString("webContentList")] as NSString);
if(myData != null)
{
MessagingCenter.Send<object, List<webContentList>>(this, "messagedata", myData);
}
}

Answer 1

可以通过扩展应用程序构造函数将数据传递给窗体项目。

iOS 中的应用代表

public override bool FinishedLaunching(UIApplication app, NSDictionary options)
{
var myData = JsonConvert.DeserializeObject<List<webContentList>>(options[new NSString("webContentList")] as NSString);
global::Xamarin.Forms.Forms.Init();
LoadApplication(new App(myData));
return base.FinishedLaunching(app, options);
}

表单中的应用

public App(List<webContentList> list)
{
InitializeComponent();
// handle the logic 
}

更新

LoadApplication(new App());
MessagingCenter.Send<object, List<webContentList>>(this, "messagedata", myData);