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Editorial Team
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Asked: 2026-06-11T18:50:24+00:00

I downloaded this sample: https://developer.apple.com/library/ios/#samplecode/Touches/Introduction/Intro.html#//apple_ref/doc/uid/DTS40007435 If I start the sample app everything is working

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I downloaded this sample: https://developer.apple.com/library/ios/#samplecode/Touches/Introduction/Intro.html#//apple_ref/doc/uid/DTS40007435
If I start the sample app everything is working fine.

I made my own app and copied most of the code into it. There is a method called adjustAnchorPointForGestureRecognizer: But in this method there is a error but only in my app (see screenshot): “Property anchorPoint cannot be found in forwar class object CALayer”. I am wondering how I can solve this issue, I don’t know what I did wrong. It is exactly the same code from the sample. Anyone can help? Thanks!
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1 Answer

  1. Editorial Team

    Did you import the QuartzCore framework into your project? Maybe that’s why it can find the CALayer class

    This error is thrown by XCode when it can’t find a definition for CALayer. You should add the framework to your project and add #import <QuartzCore/QuartzCore.h> to wherever you are using the class

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