ios - Force redraw of a UIView or CALayer on scale/transform -


say have uiview or calayer own (vector) drawing, , want remain crisp @ size, when scaling view or layer. how can make redraw when scaled transform property? way force bounds change instead of using transform? or call setneedsdisplay @ every step?

why uiimageview seem behave differently (i.e. seems scale source image appropriately, when scaled transform , bounds doesn't change)? because it's case content property of underlying calayer set directly?

if needsdisplayonboundschange on calayer not enough in case, can subclass calayer , implement + (bool)needsdisplayforkey:(nsstring *)key method. example: 

+ (bool)needsdisplayforkey:(nsstring *)key {     if ([key isequaltostring:@"transform"]) {         return yes;     }     return [super needsdisplayforkey:key]; }

now layer should redrawn everytime transform property changes. might cause performance issues in animations if drawing extensive.


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