Google 云消息：当 iOS 应用程序处于后台时不会收到警报

Question

我已遵循本教程 https://developers.google.com/cloud-messaging/ios/client to implement GCM on my iOS Application. My app server is a google app engine written in Java and I use the gcm-server.jar https://github.com/google/gcm 库。我认为我的证书没问题，我可以注册、获取令牌，甚至可以接收我的应用服务器发送的消息内容。但是，当应用程序处于后台时，我没有收到任何通知提醒，我总是只有在单击应用程序图标以重新启动它时才会收到通知。

我认为那是因为我只实现了 didReceiveRemoteNotification: 而不是 didReceiveRemoteNotification:fetchCompletionHandler: 所以我实现了它而不是第一个但是我在后台也没有收到通知更糟糕的是，应用程序崩溃时说 "unrecognized selector sent to instance didReceiveRemoteNotification:" 好像 userInfo 中有问题。我确实允许 xCode 中的背景模式，就像它所要求的那样。这是我使用的代码：

AppDelegate ()

@property (nonatomic, strong) NSDictionary *registrationOptions;
@property (nonatomic, strong) GGLInstanceIDTokenHandler registrationHandler;

@end

@implementation AppDelegate


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

//-- Set Notification
[[GCMService sharedInstance] startWithConfig:[GCMConfig defaultConfig]];
if ([application respondsToSelector:@selector(isRegisteredForRemoteNotifications)])
{
    NSLog(@"Case iOS8");
    // iOS 8 Notifications
    [application registerUserNotificationSettings:[UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeSound | UIUserNotificationTypeAlert | UIUserNotificationTypeBadge) categories:nil]];

    [application registerForRemoteNotifications];
}
else
{
    NSLog(@"Case iOS7");
    // iOS < 8 Notifications
    [application registerForRemoteNotificationTypes:
     (UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound)];
}

self.registrationHandler = ^(NSString *registrationToken, NSError *error){
    if (registrationToken != nil) {

        NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
        [defaults setObject:registrationToken forKey:TOKENGCM];
        NSLog(@"Registration Token: %@", registrationToken);
        //some code
    } else {
        NSLog(@"Registration to GCM failed with error: %@", error.localizedDescription);
    }
};
return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application {
}

- (void)applicationDidEnterBackground:(UIApplication *)application {
[[GCMService sharedInstance] disconnect];
}

- (void)applicationWillEnterForeground:(UIApplication *)application {
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
// Connect to the GCM server to receive non-APNS notifications
[[GCMService sharedInstance] connectWithHandler:^(NSError *error) {
    if (error) {
        NSLog(@"Could not connect to GCM: %@", error.localizedDescription);
    } else {
        NSLog(@"Connected to GCM");
        // ...
    }
}];
}

- (void)applicationWillTerminate:(UIApplication *)application {
}


- (void)application:(UIApplication *)application
didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken {
// Start the GGLInstanceID shared instance with the default config and request a registration
// token to enable reception of notifications
[[GGLInstanceID sharedInstance] startWithConfig:[GGLInstanceIDConfig defaultConfig]];
self.registrationOptions = @{kGGLInstanceIDRegisterAPNSOption:deviceToken,
                         kGGLInstanceIDAPNSServerTypeSandboxOption:@NO};
[[GGLInstanceID sharedInstance] tokenWithAuthorizedEntity:SENDER_ID
                                                    scope:kGGLInstanceIDScopeGCM
                                                  options:self.registrationOptions
                                                  handler:self.registrationHandler];
}

- (void)application:(UIApplication *)app didFailToRegisterForRemoteNotificationsWithError:(NSError *)err {
NSLog(@"Error in registration. Error: %@", err);
}

- (void)onTokenRefresh {
// A rotation of the registration tokens is happening, so the app needs to request a new token.
NSLog(@"The GCM registration token needs to be changed.");
[[GGLInstanceID sharedInstance] tokenWithAuthorizedEntity:SENDER_ID
                                                    scope:kGGLInstanceIDScopeGCM
                                                  options:self.registrationOptions
                                                  handler:self.registrationHandler];
}


- (void)application:(UIApplication *)application
didReceiveRemoteNotification:(NSDictionary *)userInfo {
NSLog(@"Notification received: %@", userInfo);//This does print the content of my message in the console if the app is in foreground
UIApplicationState state = [application applicationState];
if (state == UIApplicationStateActive) {
    NSString *cancelTitle = @"Close";
    NSString *showTitle = @"Show";
    NSString *message = [[userInfo valueForKey:@"aps"] valueForKey:@"alert"];
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Some title"
                                                        message:message
                                                       delegate:self
                                              cancelButtonTitle:cancelTitle
                                              otherButtonTitles:showTitle, nil];
    [alertView show];
}
else{
    NSLog(@"Notification received while inactive");
    [[UIApplication sharedApplication] setApplicationIconBadgeNumber: 99];
    UIAlertView *BOOM = [[UIAlertView alloc] initWithTitle:@"BOOM"
                                                   message:@"app was INACTIVE"
                                                  delegate:self
                                         cancelButtonTitle:@"a-ha!"
                                         otherButtonTitles:nil];
    [BOOM show];
    NSLog(@"App was NOT ACTIVE");
   [[NSNotificationCenter defaultCenter] postNotificationName:@"Notification!"
                                                        object:nil
                                                      userInfo:userInfo];
}
// This works only if the app started the GCM service
[[GCMService sharedInstance] appDidReceiveMessage:userInfo];
}

//Implement that causes unrecognized selector crash 
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))handler {
NSLog(@"Notification received: %@", userInfo);
// This works only if the app started the GCM service
[[GCMService sharedInstance] appDidReceiveMessage:userInfo];
// Handle the received message
// Invoke the completion handler passing the appropriate UIBackgroundFetchResult value
// [START_EXCLUDE]
[[NSNotificationCenter defaultCenter] postNotificationName:@"notif"
                                                    object:nil
                                                  userInfo:userInfo];
handler(UIBackgroundFetchResultNoData);
// [END_EXCLUDE]
}

@end

有人能知道我不在前台时收不到通知吗？

编辑：服务器端用于发送 GCM 消息的 Java 代码：

public static MulticastResult sendViaGCM(String tag, String message, List<String> deviceIdsList) throws IOException {
    Sender sender = new Sender(Constantes.API_KEY);
    // This message object is a Google Cloud Messaging object
    Message msg = new Message.Builder().addData("tag",tag).addData("message", message).build();
    MulticastResult result = sender.send(msg, deviceIdsList, 5);
    return result;
}

EDIT2: POST 请求的截图 http://image.noelshack.com/fichiers/2015/34/1440193492-gcm1.png http://image.noelshack.com/fichiers/2015/34/1440193502-gcm2.png

EDIT3: 我现在从我的应用服务器发送的请求：

public static void sendGCMMessage(String tag, String message, List<String> deviceIdsList) {
    String request = "https://gcm-http.googleapis.com/gcm/send";
    try{
        URL url = new URL(request);
        HttpURLConnection conn = (HttpURLConnection) url.openConnection();
        conn.setDoOutput(true);
        //conn.setInstanceFollowRedirects(false);
        conn.setRequestMethod("POST");
        //Les deux headers obligatoires:
        conn.setRequestProperty("Content-Type", "application/json");
        conn.setRequestProperty("Authorization", "key=" + API_KEY);
        //Construction du JSON:
        JSONObject fullJSON = new JSONObject();
        JSONObject data=new JSONObject();
        JSONObject notification=new JSONObject();
        data.put("tag", tag);
        data.put("message", message);
        notification.put("sound", "default");
        notification.put("badge", "1");
        notification.put("title", "default");
        notification.put("body", message);
        fullJSON.put("registration_ids", deviceIdsList);

        fullJSON.put("notification", notification);
        fullJSON.put("content_available", "true");
        fullJSON.put("data", data);

        //Phase finale:
        OutputStreamWriter wr= new OutputStreamWriter(conn.getOutputStream());
        wr.write(fullJSON.toString());
        wr.flush();
        wr.close();//pas obligatoire
        //conn.setUseCaches(false);
    }
    catch(Exception e){
        e.printStackTrace();
    }

Answer 1

在GCM documentation的基础上，可以将content_available设置为true。

(在 iOS 上，使用此字段表示 APNS 负载中可用的内容。发送通知或消息并将其设置为 true 时，不活动的客户端应用程序是唤醒。在 Android 上，数据消息默认唤醒应用程序。在 Chrome 上，目前不支持。)

content_available对应Apple的content-available，你可以在this Apple Push Notification Service documentation.

中找到

此外，您应该使用 Notification playload 向您的 iOS 应用程序发送消息，以便它可以在您的应用程序处于后台时显示横幅。

这是一个示例 HTTP 请求：

https://gcm-http.googleapis.com/gcm/send
Content-Type:application/json
Authorization:key=API_KEY
{
   "to" : "REGISTRATION_TOKEN",
   "notification" : {
     "sound" : "default",
     "badge" : "1",
     "title" : "default",
     "body"  : "Test",
   },
   "content_available" : true,
}

The Java library is just a sample, you can add other fields to it. For example, in the Message.javaclass，可以添加两个私有变量，一个是private final Boolean contentAvailable，一个是private final Map<String, String> notification。

您可以通过 curl -i -H "Content-Type:application/json" -H "Authorization:key=API_KEY" -X POST -d '{"to":"REGISTRATION_TOKEN", "notificaiton":{"sound":"default", "badge":"1", "title": "default", "body":"test",},"content_available":true}' https://android.googleapis.com/gcm/send 在您的终端中尝试 HTTP 请求，或者在 Postman.

中尝试

已编辑：

如果您的应用程序被终止，并且您希望推送通知显示在您的设备中，您可以在 HTTP 请求正文中设置 high priority（注意设置您的消息与普通优先级消息相比，高优先级更耗电)。

示例 HTTP 请求：

{
   "to" : "REGISTRATION_TOKEN",
    "notification" : {
     "sound" : "default",
     "badge" : "1",
     "title" : "default",
     "body"  : "Test",
   },
   "content_available" : true,
   "priority" : "normal",
 }

Answer 2

我有同样的问题，当应用程序被杀死时无法收到主题通知，这个POST现在正在工作，我必须添加优先级。

   {
   "to" : "/topics/offers",
   "notification" : {
     "sound" : "default",
     "badge" : "1",
     "body" : "Text",
   },
     "priority" : "high",   
}

Google 云消息：当 iOS 应用程序处于后台时不会收到警报

Google Cloud Messaging: don't receive alerts when iOS App is in background

java

objective-c

ios

google-cloud-messaging