bug(ios): Camera crash on iOS 16–17 due to deprecated AVCaptureVideoOrientation API

[bohdanovdmytro]

Description

When opening the barcode scanner, the app crashes immediately on devices running iOS 16 and iOS 17. The same devices work correctly after updating to iOS 18.

Affected devices

Device	iOS Version	Result
iPhone 8 Pro Max	16.7.14	Crash
iPhone SE (Gen 2/3)	17.5.1	Crash
iPhone 13	17.2.1	Crash

Root cause

The library uses AVCaptureVideoOrientation and videoPreviewLayer.connection?.videoOrientation which were deprecated in iOS 17.0. These are used in two places in OSBARCCaptureSessionManager.swift:

1. setup(type:) method — sets initial video orientation:

videoPreviewLayer.connection?.videoOrientation = initialVideoOrientation

2. apply(change:) method — updates orientation on rotation:

videoPreviewLayer.connection?.videoOrientation = newVideoOrientation

Both rely on:

• AVCaptureVideoOrientation (deprecated iOS 17.0)
• AVCaptureConnection.videoOrientation (deprecated iOS 17.0)

Additionally:

• UIApplication+Window.swift uses UIWindowScene.windows (deprecated iOS 15.0) instead of UIWindowScene.keyWindow
• View+CustomModifiers.swift uses onChange(of:perform:) (deprecated iOS 17.0) without an #available check for the new iOS 17+ variant

Suggested fix

Replace deprecated APIs with their modern equivalents:

1. AVCaptureVideoOrientation → use AVCaptureDevice.RotationCoordinator (iOS 17+) with a fallback to AVCaptureVideoOrientation for iOS < 17
2. UIWindowScene.windows → UIWindowScene.keyWindow (iOS 15+)
3. onChange(of:perform:) → add #available(iOS 17.0, *) check and use the new onChange(of:initial:_:) variant

Environment

• OSBarcodeLib: 2.0.1
• @capacitor/barcode-scanner: 3.0.2
• Minimum deployment target: iOS 15.0

Related: ionic-team/capacitor-barcode-scanner#118