CGAffineTransformation set the anchor?

I'm curious about something. In my app I'm running an animation where a view is resized a little bit. I'm creating the transform like this:

CGAffineTransform resize = CGAffineTransformMakeScale(0.8, 0.8);

However, when I apply this transformation to my view and watch it run, it resizes from the top and shrinks towards the bottom. What I'm wanting is wh开发者_JS百科ere it resizes evenly on all sides and shrinks towards the center, as if an "anchor" point is in the center. You know what I'm saying? Is this possible?

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First add the Quartz framework to your project and import the Quartz header

#import <QuartzCore/QuartzCore.h>

Then you can set the anchor point of your view like this

myView.layer.anchorPoint = CGPointMake(0, 0);

AnchorPoint points are values between 0 and 1. 0,0 is the top left corner on the iPhone.

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First apply a CGAffineTransformMakeTranslation to move the origin to the center -- composite them into a single transform with CGAffineTransformConcat