目标C：如何检查应用程序当前是活动（即用户在使用它）？ [英] Objective C: How to check if application is currently active (i.e. user is using it)?

问题描述

我实现了APNS推动我的应用程序有以下行为

1）如果应用程序是不是在后台继续运行，即或没有推出尚未

用户将收到一个弹出消息，在点击将带来他/她的第三个标签中的应用程序（见code以下）

   - （无效）应用：（*的UIApplication）的应用didReceiveRemoteNotification：（NSDictionary的*）USERINFO
{    self.tabController.selectedIndex = 3;}
 

2）如果您的应用启动和当前活动

没有弹出警告将显示与新通知的数量将显示在第3个选项卡上号

我的问题是我怎么能确定用户的应用程序被激活？
如何和我在哪里可以实现检查，这样我可以设置2个不同的行为？

解决方案

   - （无效）应用：（*的UIApplication）的应用didReceiveRemoteNotification：（NSDictionary的*）USERINFO
{
    如果（application.applicationState == UIApplicationStateActive）{
        //更新标签栏项目
    }
    其他{
        self.tabController.selectedIndex = 3;
    }
}
 

I am implementing an APNS push for my app with the following behaviours

1) If app is not active i.e. in background or not launched yet:

User will receive a pop up message and on click will bring him/her to the 3rd tab in the app (see code below)

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

    self.tabController.selectedIndex = 3;

}

2) If app is launch and currently active

No popup alert will be shown and the number of new notifications will show as a number on the 3rd tab

My question is how can I determine if the user's app is active? How and where can I implement the check so that I can set the 2 different behaviours?

解决方案

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
    if (application.applicationState == UIApplicationStateActive) {
        // update the tab bar item
    }
    else {
        self.tabController.selectedIndex = 3;
    }
}

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