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当App在前台时：当App在前台时可以通过以下方式获取App的消息内容：

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo

-(void)userNotificationCenter:(UNUserNotificationCenter *)center willPresentNotification:(UNNotification *)notification withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler{ NSDictionary * userInfo = notification.request.content.userInfo;}

使用了静默推送方式，可以在下面的方法中获取

-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler

userInfo就是消息内容。

当App在后台时：

使用了静默推送方式，可以在下面的方法中获取

-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler

当消息在后台时，其他的方法是没有办法获取到消息内容的，只有在点击消息以后，进入到App才可以获取到消息内容，方法如下：

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo

-(void)userNotificationCenter:(UNUserNotificationCenter *)center didReceiveNotificationResponse:(UNNotificationResponse *)response withCompletionHandler:(void (^)())completionHandler{ NSDictionary * userInfo = response.notification.request.content.userInfo;}

userInfo就是消息内容。