Hi guys,
Is it possible to animate the bounds of the CALayer on iPhone? How to implement that? Thanks!
A:
Yes, it is possible.
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:1.0f];
[[self view] setBounds:CGRectMake(0.0f, 0.0f, 200.0f, 200.0f];
[UIView commitAnimations];
This will animate a view controller's view from it's current bounds to a bounds of 200 x 200 over 1 second. It won't change the origin--just the size of the bounds rectangle. This is implicit animation by the way. If you want a more complicated animation, look at using CABasicAnimation and animating explicitly.
Matt Long
2010-06-30 01:45:34
Thanks!This is what I want to do:Imagine imagesize is 300 x 300. I want the image size to remain the same, but animate the bound area to focus on 100 x 100 specific point of the image.I googled and go through the document and kind of confusing about the frame and bounds.
sooon
2010-06-30 02:00:54
If you want to change the position and the bounds you can either animate both using -setCenter: and -setBounds: respectively, or you can animate the frame with a call to -setFrame which will animate both. It's not clear what you are wanting though. If you have a layer that overlays an image, you can animate that layer to focus in as you're describing. In that case though, you'll need to make sure your focusing layer has -setMasksToBounds: set to YES.
Matt Long
2010-06-30 02:18:04
A:
Are you trying to animate the visible part of an image inside a layer, were the layer itself maintains size and position?
That's what CAScrollLayer is made for. Use a CAScrollLayer in place of your current Layer and add image-rendering layerl as a subLayer to the CAScrollLayer. You can then use the transform property of the sublayer to achieve that effect.
tonklon
2010-07-02 16:38:21
A:
I am trying to do something like the Marvels Comics kind of image scrolling. I think I got my answer for now.
By the way, I only use CALayer to do this. I read somewhere that UIKit can do this too. Which would be a better choice?
sooon
2010-07-05 12:06:32