收到通知以后，怎样判断应用程序在前台还是后台？

Question

应用程序不管在后台还是前台都会执行-(void)application:(UIApplication*)application
didReceiveRemoteNotification:(NSDictionary*)userInfo
fetchCompletionHandler:(void
(^)(UIBackgroundFetchResult))completionHandler
那怎么在这个方法里判断应用程序在前台还是在后台呢？

Answer 1

[UIApplicationsharedApplication].applicationState==UIApplicationStateActive这是在前台UIApplicationStateBackground这是在后台

Answer 2

在AppDelegate中有如下几个方法,用一个flag标记是否是前台-(void)applicationDidEnterBackground:(UIApplication*)application{//程序进入后台flag=NO;}(void)applicationDidBecomeActive:(UIApplication*)application{//程序进入前台flag=YES;}