Core Animation model and presentation layers
A view animates across the screen over 3 seconds with a UIView animation. Tapping it mid-flight does nothing, and printing view.frame mid-animation already shows the destination value. Why do these two things happen?
UIKitMultiple choiceBasics
This Auto Layout code is meant to slide a panel up, but the panel jumps into place with n…
#animation
UIKitShort answerBasics
When you tap the screen in a UIKit app, how does the system decide which view receives th…
#touch
UIKitMultiple choiceAdvanced
You've put a round button in the middle of a custom UIKit tab bar that sticks 20pt up abo…
#touch
UIKitShort answerAdvanced
How do UIView and CALayer relate to each other, and why are their roles split?
#core-animation