In a UIKit list, you applied layer.cornerRadius plus masksToBounds plus shadow to cells with profile images and the scroll frame rate dropped. From the render pipeline's point of view, why is this expensive?
Masks and shadows force an offscreen pass where the compositor draws the layer into a separate buffer first and then composites it again, so the GPU pays a context switch for every cell.
UIKitShort answerAdvanced
How do UIView and CALayer relate to each other, and why are their roles split?
#rendering #core-animation
Performance and debuggingShort answerAdvanced
Can you explain the causes of dropped frames, split into the CPU side and the GPU side?
#core-animation #gpu
UIKitShort answerExpert
A view animates across the screen over 3 seconds with a UIView animation. Tapping it…
#core-animation
UIKitMultiple choiceExpert
In one cycle of the main run loop, what's the correct order of the passes UIKit runs to…
#core-animation