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Re: best way to add transitions

Subject: Re: best way to add transitions
From: M Pulis <email@hidden>
Date: Tue, 2 Dec 2008 02:36:00 -0700
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Matt,

Tried the IB trick, not sure what else to do to start it as now my images do not show up at all.

My attract mode timer is still firing, calling setImageWithURL to change the picture every couple seconds, just nothing visual happens.

Turn off IB fade, pictures show and change fine.

Will try the code approach, but, I have my doubts as the IB trick sounds like it should have been all that is needed, and it does not work (in my case). I must be missing something.

Read the container doc... still not quite grokking - but getting clearer. Part of my problem is relative newness to cocoa and still battling lingo.

Gary


On Dec 1, 2008, at 7:57 PM, Matt Long wrote:

Gary,
I haven't used IKImageView, however, it does implement the NSAnimatablePropertyContainer protocol:

http://developer.apple.com/documentation/Cocoa/Reference/ NSAnimatablePropertyContainer_protocol/Introduction/ Introduction.html#//apple_ref/occ/intf/NSAnimatablePropertyContainer

This means that you can set its transition animation for a key you specify. Most notably, the key you want is 'subviews' (I believe). Try something like this:

[imageView setAnimations: [NSDictionary dictionaryWithObjectsAndKeys:transition, @"subviews", nil]];
Where 'transition' is a CATransition animation. Something like this:
CATransition *transition=[CATransition animation];
[transition setType:kCATransitionFade];
[transition setSubtype:kCATransitionFromTop];
[transition setDuration:1.0f];
If you don't need to do it in code, you can also select a transition using Interface Builder. Just click on your IKImageView view in IB and select the "Effects" tab in the inspector. At the bottom you'll see a segment called "Transitions". Select "Custom" and in the Subview drop down, then select "Fade" for the Type.
HTH,
-Matt
On Dec 1, 2008, at 7:54 AM, M Pulis wrote:
Hello Cocoa folk,
My app uses an IKImageView in its main window. Until the user engages some function, the IK view sequentially displays slides prompting the user to become involved, a typical attract mode.

What is now requested is a transition such as fade (or any of the variety of transitions) instead. From reading about views, layers and transitions (oh my!), I am seeing more trees than forest....

What is the best approach to add transitions to an IKImageView? An outline should do, I ought to be able to figure out the calls by now.
Thanks!
Gary


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