How does KVO in the Objective-C runtime detect property changes under the hood?
The runtime dynamically subclasses the observed object's class (isa swizzling) to intercept the setter and call willChange/didChange. New code replaces it with @Observable or Combine.
ArchitectureShort answerIntro
Can you explain the Delegate pattern that shows up all over UIKit?
#kvo
ArchitectureMultiple choiceExpert
Which of these statements about method swizzling are correct? Select all that apply.
#objective-c-runtime
PersistenceShort answerBasics
In the Objective-C days, YYModel and MJExtension turned JSON into models and even handled…
#kvc
SwiftUIShort answerAdvanced
In SwiftUI, what does the iOS 17 @Observable macro give you over the older…
#observation