Flipping coordinate system of a CALayer
Flipping coordinate system of a CALayer
- Subject: Flipping coordinate system of a CALayer
- From: Oleg Krupnov <email@hidden>
- Date: Thu, 15 Jul 2010 19:18:42 +0300
Hi,
In a layer-hosting custom view, I'm flipping the root layer coordinate
system with the following code:
CGAffineTransform flipTransform;
flipTransform.a = 1.0;
flipTransform.b = 0.0;
flipTransform.c = 0.0;
flipTransform.d = -1.0;
flipTransform.tx = 0.0;
flipTransform.ty = 0.0;
[rootLayer setAffineTransform:flipTransform];
This code works fine and causes the layer and all its sublayers to
flip so that the origin is in the top left corner.
However, the problem is that when I place this custom view inside
another layer-backed view (or just check the "Wants Core Animation
Layer" box of the parent view in Interface builder), I observe that
the coordinate system of the layer is unflipped, like if the code
above did not have any effect.
Is this a bug? And how to work around it?
I could use the 10.6's geometryFlipped property, which is free of this
problem, but I'd still like to support 10.5.
Thanks!
Oleg.
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