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Performance tuning with shadow drawing in iOS

December 21, 2012

Drawing shadows is expensive operation, so for example if your application allows other interface orientation and you start to rotate the device, without specifying explicitly the path of the shadow it has to be rendered several times during that animation which will, depending on the shape, probably visibly slow down the animation .

if your view is going to have rounded corners use bezier path.

http://stackoverflow.com/questions/805872/how-do-i-draw-a-shadow-under-a-uiview

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