iOS UI (SwiftUI & UIKit).

The iOS view layer: SwiftUI, UIKit, Core Animation and WidgetKit. Covers 7 sub-skills.

• iOS UI (SwiftUI & UIKit) · 1 of 3

  UIKit Views & Controllers

  In a UIViewController lifecycle, which callback fires earlier in the sequence: viewDidLoad or viewWillAppear?

  AviewWillAppear runs first since it precedes the initial view loadingBBoth fire simultaneously when the controller is instantiated from a nibCviewDidLoad runs every time the controller is pushed onto the stackDviewDidLoad fires once after the view hierarchy is loaded into memory

• iOS UI (SwiftUI & UIKit) · 2 of 3

  SwiftUI Views & Modifiers

  You build a list-detail layout that should show a sidebar on iPad and collapse to a stack on iPhone. Which iOS 16+ container is purpose-built for this responsive pattern?

  ANavigationSplitViewBNavigationStackViewCAdaptiveNavigationDColumnNavigation

• iOS UI (SwiftUI & UIKit) · 3 of 3

  SwiftUI Views & Modifiers

  On iOS 17, which modifier two-way-binds the identity of the topmost visible item in a ScrollView so you can drive an external page indicator from view state?

  A.scrollPosition(id:)B.scrollAnchor(id:)C.visibleItem(binding:)D.scrollFocus(id:)