How to push a new version of a view into visibility...

Question

I have a UIView on screen, with a bunch of buttons. The user taps one of the buttons, and I want to change the screen by adding a bunch of new buttons. but I don't want the new buttons to just pop into view, I want to have basically a copy of the view in its new form push in from the right side pushing out the old form of the view. If I create a second view window it doesn't work so hot because some of the graphic elements are common to both left and right sides, and when I set the view for a UILabel it will cause disappearance from the old view. Does one make a bitmap copy of the screen, create a "dummy" static view to the left of the good view (which is translated to the right), and then push them both together over? Or do i expand the view to have two screens of width, and do a bitmap copy of the view over to the left side and then just translate the view over using a simple UIView animation where the frame goes from one value to another? How does one copy the screen as it is?
Or is there a simpler way, where you can put up a view in a new position and push over the old one as it is presumably in a cache anyway? Can one gain access to the cached, composited bitmaps that are lurking?

Answer 1

itunesjack wrote:
Or is there a simpler way, where you can put up a view in a new position and push over the old one as it is presumably in a cache anyway? Can one gain access to the cached, composited bitmaps that are lurking?
I think CATransition does this for you. I think it just looks at the before and after and interpolates without regard to where the two images came from. So, for example:
#define kAnimationKey @"myViewAnimation"
-(IBAction)changeView:(id)sender {
// change the view anyway you want here
CATransition *animation = [CATransition animation];
[animation setDelegate:self];
[animation setType:kCATransitionPush];
[animation setDuration:1.0];
[animation setTimingFunction:
[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[[self.view layer] addAnimation:animation forKey:kAnimationKey];
If the duration is very long you may wnat to play with the order or implementation of the changes and/or the Timing Function if you don't want to reveal the work in progress, but the above should get you started.