问题
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?
回答1:
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo
{
if (application.applicationState == UIApplicationStateActive) {
// update the tab bar item
}
else {
self.tabController.selectedIndex = 3;
}
}
回答2:
My answer for new modern visitors...
Swift variable : Simply put this any where outside classes to check for app active state .
var isApplicationActive:Bool {
get {return UIApplication.sharedApplication().applicationState == .Active}
}
so your code in swift will be
func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
if isApplicationActive {
//Change badge number ...
} else {
}
}
来源：https://stackoverflow.com/questions/6730531/objective-c-how-to-check-if-application-is-currently-active-i-e-user-is-using