IPhone SDK - CATextLayer Crash in < 3.2

Question

I have created an app which runs fine on devices using iOS 3.2 or above but on older versions of the OS it crashes with the error

dyld: Symbol not found: _OBJC_CLASS_$_CATextLayer Referenced from: /var/mobile/Applications/70D5888B-B531-484F-997D-776B432FFA52/Test.app/Test Expected in: /System/Library/Frameworks/QuartzCore.framework/QuartzCore

I realize this is because CATextLayer wasn't available before 3.2 but does anyone know what I can do to still make it run in older versions? I have tried checking the version and only calling the layers if it's 3.2+ but the crash seems to happen when it loads in the framework instead of when it actually tries to change a layer.

Thanks.

Answer 1

weakly link the framework, then check to see if the class exists before using it in your code. There are multiple questions here on how to do that.

Answer 2

Follow the process that I describe in this answer, only weak link the QuartzCore framework in addition to UIKit. It's the same problem the asker was having there, only for a different symbol in a different framework.