animation similar to opening app in ios7

Question

I want to create an animation similar to app opens in iPhone in iOS7. In this animation it just shows that app is opening from which point and closing at same point.

Answer 1

As far as I know, that animation is made using screenshots. It updates the frame of the view and simultaneously makes a smooth transition from the app logo to the screenshot from the app. I have imitated the opening of the iPod (music) application from the bottom right corner of the device to the screen size:

UIView * v = [[UIView alloc]init];
CGSize size = self.view.bounds.size;
CGRect frameInitial = CGRectMake(size.width - 30, size.height - 30, 20, 20);
CGRect frameFinal = CGRectMake(0,0, size.width, size.height);
[v setFrame:frameInitial];

Then use the lines below when you want to animate the frame size:

[UIView animateWithDuration:0.3f
                      delay:0.0f
                    options:UIViewAnimationOptionBeginFromCurrentState
                 animations:^{

    [v setFrame:frameFinal];

} completion:nil];

Edit: Did not realize that the zooming also included the background. The code below is not tested (I am not at work) so expect some defects and typos.

Imagine you have two layers on the view controller's view. Directly on the vc there is the app you want to be opened, lets call it finalView. And on the top layer there is the window with all apps, which will zoom and fade into your app, which is a view behind it. Lets call it firstView.

Initial cond: firstView has a frame of 320 x 480 (It is a window with all the app icons). It has an alpha of 1. finalView has the same frame and alpha, but it is behind firstView. Final cond: finalView will still have the same frame and alpha. But firstView will zoom into bottom right corner (will have a huge frame) and fade out (alpha -> 0).

//Initial cond: (Or better yet use IB)

CGRect frameInitial = CGRectMake(0,0, self.view.size.width, self.view.size;
CGRect frameFinal = CGRectMake(self.view.size.width * -4 ,self.view.size.height * -5, self.view.size.width * -5,self.view.size.width * -6);
[v setFrame:frameInitial];

Then use the lines below when you want to animate the frame size:

[UIView animateWithDuration:0.3f
                      delay:0.0f
                    options:UIViewAnimationOptionBeginFromCurrentState
                 animations:^{

                                 [v setFrame:frameFinal];

                              } completion:nil];