Making a CALayer and all the things inside it semi-transparent?

Set layer. Opacity = 0.5 or whatever you want it to be.

Heh, I started reinventing the wheel O.o. Thanks! – Nick Brooks Jul 25 '10 at 21:06 That doesn't apply to CoreGraphics elements – Nick Brooks Jul 25 '10 at 21:10 It should apply to everything in the layer.

Can you provide more detail as to what you're doing? – jtbandes Jul 25 '10 at 21:11 Drawing filled rectangles with CoreGraphics. They stay opaque.

– Nick Brooks Jul 25 '10 at 21:14 Where are you drawing them? – jtbandes Jul 25 '10 at 23:59.

Depending on your application, one thing to keep in mind apart from jtbandes answer, is going to be performance. Transparency on the iDevice platforms is not a fast operation, so doing too much of it can be a bad thing. Please keep this in mind.

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