ios - 关于在ios中保存来自远程通知的信息

Question

我有一个带有结构的推送通知

{
    "aps":
    {
        "alert": "Hello, world!",
        "sound": "default",
        "funcId": "abc"  <-- this key i add more
    }
}

我想存储键 "funcId" 的值，以便在应用收到通知(应用处于背景状态或被杀死)后使用，例如:

-(void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary*)userInfo fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))completionHandler
{
   NSString *sFuncID = [[userInfo objectForKey:@"aps"] objectForKey:@"funcId"];
   [[NSUserDefaults standardUserDefaults] setValue:sFuncID forKey:Key_ID_notification];
   [[NSUserDefaults standardUserDefaults] synchronize];
}

我曾尝试使用 NSUserDefaults 来存储这个值，但是当应用程序处于状态后台并杀死这个值时，这个值没有存储。如何存储远程通知的值，以便在应用重启时使用？

感谢大家的支持!

Answer 1

您必须使用两种不同的方法处理推送通知，因此，您必须使用两种不同的方法保存该值。在将值/对象保存到 NSUserDefaults 之前，您还需要确保 userInfo 不是 nil。

代码如下:-

//Receive Push Notification when the app is active in foreground or background
- (void)application:(UIApplication *)application 
           didReceiveRemoteNotification:(NSDictionary *)userInfo {

  if(userInfo){
   //TODO: Handle the userInfo here
    NSString *sFuncID = [[userInfo objectForKey:@"aps"] objectForKey:@"funcId"];
    [[NSUserDefaults standardUserDefaults] setValue:sFuncID forKey:Key_ID_notification];
    [[NSUserDefaults standardUserDefaults] synchronize];
   }

}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    //Get the push notification when app is not open
    NSDictionary *remoteNotif = [launchOptions objectForKey: UIApplicationLaunchOptionsRemoteNotificationKey];

    if(remoteNotif){
        [self handleRemoteNotification:application userInfo:remoteNotif];
    }

    return YES;
}

-(void)handleRemoteNotification:(UIApplication*)application userInfo:(NSDictionary*)userInfo{

    if(userInfo){
   //TODO: Handle the userInfo here
    NSString *sFuncID = [[userInfo objectForKey:@"aps"] objectForKey:@"funcId"];
    [[NSUserDefaults standardUserDefaults] setValue:sFuncID forKey:Key_ID_notification];
    [[NSUserDefaults standardUserDefaults] synchronize];
   }
}