Apple SDK & System Capabilities.

App lifecycle plus system frameworks (Core Location/MapKit, AVFoundation): a breadth/integration composite, not a single trait. Covers 7 sub-skills.

• Apple SDK & System Capabilities · 1 of 3

  App Lifecycle & Scenes

  In a brand-new SwiftUI iOS app for 2026, which annotation goes on the type that conforms to the App protocol and serves as the program entry point?

  A@entryB@startC@mainD@root

• Apple SDK & System Capabilities · 2 of 3

  AVFoundation & Media

  You want to observe playback progress roughly every half second on an AVPlayer. Which method gives you a periodic callback tied to the player's clock?

  AaddBoundaryTimeObserver with one fixed end time valueBaddPeriodicTimeObserver with an interval and a closureCKVO on the player rate property for each playhead updateDA repeating Timer reading player.currentTime each tick

• Apple SDK & System Capabilities · 3 of 3

  AVFoundation & Media

  Your video player pauses by itself whenever the buffer dips on a flaky connection, even though you want it to wait and keep trying. Which property controls that stall behavior?

  ApreferredForwardBufferDuration on the AVAudioSession configBautomaticallyWaitsToMinimizeStalling on the AVPlayer instanceCcanUseNetworkResourcesForLiveStreamingWhilePaused on the layerDpreferredPeakBitRate set directly on the AVPlayer rate property