Question

I receive a pust notification and push a view controller based on the data i get in push.
I do it like this:

   UINavigationController *navVc=(UINavigationController *) self.window.rootViewController;
   PictureTakeVC *pvc=[[PictureTakeVC alloc] init];
   [navVc pushViewController:pvc animated:NO];

It works, but the view controller that was opened before i pressed home button shows for a moment.

I also tried this but it happens the same:

PictureTakeVC *pvc=[[PictureTakeVC alloc] init];            
NSArray *vcs=[[NSArray alloc] initWithObjects: pvc, nil];
UINavigationController *navVc=(UINavigationController *) self.window.rootViewController;
navVc.viewControllers=vcs;
self.window.rootViewController = navVc;

How to push vc didReceiveRemoteNotification so that it opens immediatly and no other vc is shown for a moment?

Answer 1

As you said “but the view controller that was opened before i pressed home button shows for a moment.”,

The reason is not the code, but the iOS system.
It captures screenshot of the screen when app goes in background. As documented:

Remove sensitive information from views before moving to the
background. When an app transitions to the background, the system
takes a snapshot of the app’s main window, which it then presents
briefly when transitioning your app back to the foreground. Before
returning from your applicationDidEnterBackground: method, you should
hide or obscure passwords and other sensitive personal information
that might be captured as part of the snapshot.

So, if snapshot is removed then it will directly show the new pushed view controller.
(not sure about apple guideline for snapshot)

Update:

One approach can be:
Add a black colored background on the app screen when it goes in background(in applicationDidEnterBackground method). So, it will show black screen while coming back to application.{ They store it for showing launch image for already started application.}

Where it helps?

When we delete snapshots from ‘Preference’ directory of application sandbox(after application goes in background) and come back to application it shows black for a while as it does not have any snapshot.

The outcome of our approach and removing snapshot are same.