如果应用在推送通知中处于活动状态

Question

发送推送通知后，我希望应用在我的收件箱页面上打开，以便用户可以在收件箱中看到新消息。我有下面的代码在我的AppDelegate

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

    [self.tabController setSelectedIndex:2]; 
} 

当我发送推送消息和手机被激活，它直接有没有警告。我知道那什么是应该与我的代码，这样做，但有没有办法改变它像这样

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

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

对此有何见解将大大有助于。谢谢！

Answer 1

从斯坦尼斯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; 
    } 
} 

希望它有帮助！

Answer 2

你可以，一旦你进入应用一个布尔值设置为YES，只需设置在布尔：

- (void)applicationWillEnterForeground:(UIApplication *)application 

，并设置BOOL到NO在

- (void)applicationDidEnterBackground:(UIApplication *)application 

Answer 3

你可以告诉如果应用程序是在前台通过检查applicationState像这样：

- (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 
    ... 
}