如果應用在推送通知中處於活動狀態

Question

發送推送通知後，我希望應用在我的收件箱頁面上打開，以便用戶可以在收件箱中看到新消息。我有下面的代碼在我的AppDelegate

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

    [self.tabController setSelectedIndex:2]; 
} 

當我發送推送消息和手機被激活，它直接有沒有警告。我知道那什麼是應該與我的代碼，這樣做，但有沒有辦法改變它像這樣

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

    if(app.isActive == FALSE) 
      [self.tabController setSelectedIndex:2]; 
} 

對此有何見解將大大有助於。謝謝！

Answer 1

從斯坦尼斯Yaglo，Objective C: How to check if application is currently active (i.e. user is using it)?：

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

    if (application.applicationState == UIApplicationStateActive) { 
     // For example, update the tab bar 
    } 
    else { 
     self.tabController.selectedIndex = 3; 
    } 
} 

希望它有幫助！

Answer 2

你可以，一旦你進入應用一個布爾值設置爲YES，只需設置在布爾：

- (void)applicationWillEnterForeground:(UIApplication *)application 

，並設置BOOL到NO在

- (void)applicationDidEnterBackground:(UIApplication *)application 

Answer 3

你可以告訴如果應用程序是在前臺通過檢查applicationState像這樣：

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo 
{ 
    if (application.applicationState == UIApplicationStateActive) 
     // app is in the foreground 
    else 
     // app was just brought from background to foreground 
    ... 
}