iphone - -[UIImage CGImage] returning nil -

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i'm wondering under circumstances code breaks in second assert. in other words, when can -[uiimage cgimage] return nil? documentation isn't telling here.

- (void)setimage:(uiimage *)animage {     assert(animage);     cgimageref cgimage = animage.cgimage;     assert(cgimage); }

i'm pretty sure, uiimage correct since it's fetched app bundle. far haven't been able reproduce case see user crash reports.

another possibility have multiple threads accessing same uiimage object @ same time; happening in code same symptom.

that might explain sporadic crash reports, too, since access patterns depend on timing changes run run.


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