ios - Push a uiviewcontroller on top of existing ViewController when my App becomes active again -


my app has multiple uiviewcontrollers can displayed user @ time. app can started document (for example, attachment mail app).

the scenario following: - user starts app , navigates inside application - user puts app in background mode , goes mail app - mail app user selects mail attachment , opens attachment app - app enter in foreground , display attachment in specific view controller. - when user has finished attachment, should able return previous state in app (before attachment opened).

i have overloaded following methods uiapplicationdelegate:

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions - (bool)application:(uiapplication *)application openurl:(nsurl *)url sourceapplication:(nsstring *)sourceapplication annotation:(id)annotation { - (void)applicationdidbecomeactive:(uiapplication *)application

using these methods i'm able find if there's document displayed , if app started or not.

my issue push specific viewcontroller.

below extract of code push viewcontroller nothing happen, idea? how can find active viewcontroller in app?

- (void)applicationdidbecomeactive:(uiapplication *)application {     nslog(@"applicationdidbecomeactive");      if (_navigationcell != nil)      {         if ([datacenter sharedinstance].isappstarting == false)          {             // push new navigation stack display cell navigation             //pusharroundmeid             uiwindow* window = [uiapplication sharedapplication].keywindow;             uiviewcontroller* rvc = window.rootviewcontroller;             uistoryboard* sb= [uistoryboard storyboardwithname:@"mainstoryboardiphoneapp" bundle:[nsbundle mainbundle]];             aroundmeviewcontroller* avc = [sb instantiateviewcontrollerwithidentifier:@"aroundmeviewcontrollerid"];              if (avc != nil) {                 [rvc presentviewcontroller:avc animated:true completion:null];                 window.rootviewcontroller = avc;             }         }     } }


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