CODEWITHSUNDEEP
iosxcodeviewcontrollerappdelegate
Stefan S
Stefan S

Reputation: 267

How to call a view controller from AppDelegate in iOS

I am creating an iOS app in which I have the following requeriment: the app should show the login screen when it starts the first time and also that screen must also be shown when the app comes from the background to the foreground, in case it has been sent to background during run time.

I have handled to show the screen in both cases. However, when I do it and the app comes from the background, and I click the texfield to type my password, the app gets frozen, and it fails in a thread that I don't know what it means.

I call the screen to be shown when the app comes from background like this, in the applicationWillEnterForeground, in AppDelegate:

self.window=[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
RoomRootViewController* room = [[RoomRootViewController alloc] init];
[[self window] setRootViewController:room];
[self.window makeKeyAndVisible];

Is this the correct way to do so?

Thanks a lot in advance ! I am completely lost with this as I am very new in iOS, so any help will be very appreciated.

Attached in an image you can see where the app fails. Screenshot of the thread where the app fails

Screenshot of the tracking made to interpret the thread issue

Upvotes: 2

Views: 19856

Answers (2)

iEinstein
iEinstein

Reputation: 2100

It will be very messy if you are using this line of code 

self.window=[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

It means every time you are creating new instance of UIWindow which will contain UIViewController and all other component each time. Which means when you go to background and comes to foreground the old window instance has been flushed off and it will contain new components that's why when you click on the UITextField it has been deallocated, The reason you are getting error. Don't create new instance of window and use the code as @PartiallyFinite does.

Hope this helps.

Upvotes: 0

Greg
Greg

Reputation: 9178

The code you are currently using is completely deleting the root view controller of your app window, in other words, you are deleting all the views and view controllers in your app. If you are not using ARC, this is just one huge memory leak. If you are, it's still not a very good idea.

In your applicationWillEnterForeground: method, try using this code instead:

RoomRootViewController* room = [[RoomRootViewController alloc] init];
[self.window.rootViewController presentViewController:room
                                             animated:NO
                                           completion:nil];

This will display the RoomRootViewController over the top of all your app's current views, instead of deleting them. You can then dismiss it like this:

[self.window.rootViewController dismissViewControllerAnimated:YES
                                                   completion:nil];

and easily return to the rest of your app.

Upvotes: 8

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