Still Trying to Switch Views

I am having a devil of a time trying to figure out how to switch views in a
simple iPhone app. The app has two UIView Subclasses ... call them View1
and View2. I went to IB and created two xib files ... View1 and View2 and
populated them with buttons that I want to use to switch between the views
(the button on View1 will cause View2 to be displayed and the button on
View2 will cause View1 to be displayed). Back in View1.m I have a IBAction
routine to handle the touching of the button in View1 ... this sets up an
animation group:

[UIView beginanimations:nil context:nil];
[UIView setAnimationDuration:0.75];
[UIView setAnimationDelegate:View2];
[UIView
setAnimationDidStopSelector:@selector(transitionDidStop:funished:context:)];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft
forView:View2 cache:YES];
[UIView commitAnimations];

Now it seems to me that this should rotate View1 out of the way and display
View2 ... but it does not. The program compiles without error but when I
run it and touch the button on View1 nothing happens. I know it is
executing this code because I have used breakpoints and stepped through it.
Interstingly, if I change the forView parameter (in the
setAnimationTransition statement) to self and then touch the button View1
rotates and redisplays itself. For some reason I cannot get the program to
act on View2. I must not be doing something right ... as far as I know all
the xib components are connected properly.

Can someone help me ... perhaps by directing me to a tutorial that talks
about switching views in an app which has this general structure ... two
UIView subclasses and corresponding xib files.

Thanks very much.

In article <gs3o0202a9i RemoveThis @enews2.newsguy.com>,
"fripper" <young RemoveThis @indiana.edu> wrote:

> I am having a devil of a time trying to figure out how to switch views in a
> simple iPhone app. The app has two UIView Subclasses ... call them View1
> and View2. I went to IB and created two xib files ... View1 and View2 and
> populated them with buttons that I want to use to switch between the views
> (the button on View1 will cause View2 to be displayed and the button on
> View2 will cause View1 to be displayed). Back in View1.m I have a IBAction
> routine to handle the touching of the button in View1 ... this sets up an
> animation group:
>
> [UIView beginanimations:nil context:nil];
> [UIView setAnimationDuration:0.75];
> [UIView setAnimationDelegate:View2];
> [UIView
> setAnimationDidStopSelector:@selector(transitionDidStop:funished:context:)];
> [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft
> forView:View2 cache:YES];
> [UIView commitAnimations];
>
> Now it seems to me that this should rotate View1 out of the way and display
> View2 ... but it does not. The program compiles without error but when I
> run it and touch the button on View1 nothing happens.

That's because you haven't actually done anything to change the view.
All these method calls describe how the animation should appear when the
change happens, but there's nothing in there to actually cause that
change. Before you commit the animations you've got to make some kind
of change that will be animated-- in this case, removing one view and
adding another one in its place.

Setting an animation delegate and a "did stop" selector just tells
UIView what method to call when the animation completes, it doesn't make
any animated changes occur.

--
Tom "Tom" Harrington
Independent Mac OS X developer since 2002
http://www.atomicbird.com/