Apple SDK & System Capabilities.

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

• 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

  An AVPlayer progress bar should refresh twice a second in media time and stop refreshing while playback is paused. Which API fits?

  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 playback to resume on its own once enough data arrives. Which property controls that stall behavior?

  ApreferredForwardBufferDuration on the AVAudioSession configBautomaticallyWaitsToMinimizeStalling on the AVPlayer instanceCcanUseNetworkResourcesForLiveStreamingWhilePaused on the layerDactionAtItemEnd set to .pause on the AVPlayer instance