What's the difference between UIView and CALayer?
A UIView owns layout, hit-testing, and events; its backing CALayer owns compositing, visual effects, and Core Animation
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Questions tagged “UIKit”
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What is UIResponder?
Follow a single tap from the button that was pressed up to the app delegate, and use that walk to explain first responder, nil-targeted actions, and why hit-testing is a separate step
What is the UIViewController lifecycle and when is each method called?
Walk through every important UIViewController lifecycle callback, explain its purpose, show the call order with print(#function), and clarify where to put subview setup, constraints, and observation
What's the difference between frame and bounds in iOS?
Explain how frame and bounds describe the same view from two different coordinate systems, then connect that model to layout, transforms, and scrolling