AVFoundation iOS 12.1 to 12.2 API Differences

../Frameworks/AVFAudio.framework/Headers/AVAudioSession.h
Added AVAudioSessionPromptStyle
Added AVAudioSessionPromptStyleNone
Added AVAudioSessionPromptStyleShort
Added AVAudioSessionPromptStyleNormal
Added AVAudioSession.promptStyle
AVCaptureSession.h
Modified AVCaptureConnection.output
Declaration
From@property (nonatomic, readonly, nonnull) AVCaptureOutput *output
To@property (nonatomic, readonly, nullable) AVCaptureOutput *output

Modified AVCaptureConnection.videoPreviewLayer
Declaration
From@property (nonatomic, readonly, nonnull) AVCaptureVideoPreviewLayer *videoPreviewLayer
To@property (nonatomic, readonly, nullable) AVCaptureVideoPreviewLayer *videoPreviewLayer

AVContentKeySession.h
Added AVContentKeySessionServerPlaybackContextOption
Added AVContentKeySessionServerPlaybackContextOptionProtocolVersions
Added AVContentKeySessionServerPlaybackContextOptionServerChallenge
Added -[AVContentKeySession invalidatePersistableContentKey:options:completionHandler:]
Added -[AVContentKeySession invalidateAllPersistableContentKeysForApp:options:completionHandler:]
Added AVContentKeyRequest.options
AVSampleBufferDisplayLayer.h
Added AVSampleBufferDisplayLayer.preventsCapture