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A preview from our curated question bank. The generator produces fresh, AI-tailored questions on each run.
What is the difference between a struct and a class in Swift?
Tip: Structs are value types (copied on assignment), classes are reference types (shared pointer). Structs: no inheritance, thread-safer. Classes: support inheritance, deinit, identity comparison. Prefer structs for data models.
What is ARC (Automatic Reference Counting) in iOS?
Tip: ARC automatically inserts retain and release calls at compile time — no garbage collector at runtime. Objects are deallocated when their reference count hits 0. ARC is deterministic. The main pitfall is retain cycles.
What is the difference between strong, weak, and unowned references in Swift?
Tip: Strong: increments retain count (default). Weak: does not retain, becomes nil when deallocated — use for delegates to break cycles. Unowned: like weak but not optional — use when the referenced object always outlives the reference.
What is the delegate pattern in iOS? Give a real example.
Tip: Delegate: a protocol that an object implements to receive callbacks from another object. Classic example: UITableViewDelegate — the table view calls methods on its delegate when a cell is tapped. Hold a weak reference to the delegate to avoid retain cycles.
What is the difference between UIKit and SwiftUI? When would you use each?
Tip: UIKit: imperative, 14 years of history, any iOS version. SwiftUI: declarative, state-driven, requires iOS 13+, faster to iterate but less mature. Mixed codebase is common via `UIHostingController` and `UIViewRepresentable`.
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