PhotoKit & AVFoundation Capture (iOS)

Photo-library picking, library access, and custom camera capture for a fintech iOS app (document/ID capture, receipt attachments, avatars). Grounded in Apple's PhotosUI, Photos (PhotoKit), and AVFoundation frameworks; targets the iOS 26 era.

• Decision: need a plain image/video pick with no library permission? Use PhotosPicker (SwiftUI) or PHPickerViewController (UIKit) — both run out of process and hand back only chosen items. Need to enumerate/organize the library, observe changes, or fetch by metadata? That requires PHPhotoLibrary authorization and PhotoKit. Need live camera (KYC selfie, ID/cheque scan)? Use AVFoundation.
• Cross-refs: OCR / barcode / MRZ / document rectangle detection on a captured frame → vision-framework; on-device image models → coreml; permission strings & privacy manifest for submission → app-store-review; if a KMP commonMain screen needs the picker, expose an expect capture interface bound to an iosMain actual → expect-actual.

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