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POCALayer -display method not being called
 

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  1. POCALayer -display method not being called
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    <p>I'm building a picture book for the iPad with CoreAnimation. I did something like a Sprite class (a CALayer subclass) in order to be able to load my animation frames from a sprite sheet. Something similar than here: <a href="http://mysterycoconut.com/blog/2011/01/cag1/" rel="nofollow">http://mysterycoconut.com/blog/2011/01/cag1/</a>. I'm not using the layer's delegate in order to set the bounds and contentsRect (and in my case, also the position), but I'm doing it directly in the -display method of the CALayer subclass. </p> <p>I created a dummy and it was working perfectly. When I moved the code into my project, the -display method of my subclass doesn't get called anymore. I have read the documentation of the CALayer and the CoreAnimation Programming Guide tons of times and I can't find any information about when the -display method is being called. I only know that it uses the Template Pattern, that means, I shouldn't call it myself but instead [layer setNeedsDisplay] should be called, which calls the -display method itself. I tried doing this as well, without success. </p> <p>If you need to see some code, let me know. </p> <p>Any ideas?</p> <p><strong>UPDATE</strong></p> <p>I found the reason why the method wasn't being called. It's so embarrassing that it's not worth mentioning :0. Anyway, I would be still interested to know when exactly the -display method is being called. I noticed that I have to create an animation in order for it to be triggered. If I just added the layer to the display hierarchy with [layer addSublayer:myCustomLayer], the method didn't get called.</p>
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    1. CODon't worry about embarrassment - if you had the problem, somebody else will eventually too, and you posting the answer would help them.
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    2. COWell the solution to my problem didn't have anything to do with my original problem, therefore I thought it wouldn't be of interest for anybody. I'll post an answer with my silly mistake anyway.
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