Change background image after purchased

Question

I am setting background image in a ViewController demo version. After purchase or Buy something using in app purchase, i want to change background image.

background image in ViewController1.m and in app purchase in ViewController2.m.

How to pass the value from ViewController2.m to ViewController1.m to change the background image.

Answer 1

Set a value in userdefaults in viewcontroller2 after purchasing. Then check this value in viewcontroller1 and update accordingly.

Answer 2

Use NSNotificationCenter. add observer in ViewController1.m's viewDidLoad

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeBackground) name:kChangeBGNotification object:nil];

do the changes in -(void)changeBackground method

post the notification in ViewController2.m's

   [[NSNotificationCenter defaultCenter] postNotificationName:kChangeBGNotification object: managedObject];

Answer 3

Here is example to pass values between viewController.

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
        ShareMeU *destVieController = segue.destinationViewController;
         destVieController.backgorndImageName =@"image.png"
}

You can get this values in viewDidLoad method.