react-native-vision-camera/ios/VideoCaptureDelegate.swift

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//
// VideoCaptureDelegate.swift
// Cuvent
//
// Created by Marc Rousavy on 14.01.21.
// Copyright © 2021 Facebook. All rights reserved.
//
import AVFoundation
// Functions like `startRecording(delegate: ...)` only maintain a weak reference on the delegates to prevent memory leaks.
// In our use case, we exit from the function which will deinit our recording delegate since no other references are being held.
// That's why we're keeping a strong reference to the delegate by appending it to the `delegateReferences` list and removing it
// once the delegate has been triggered once.
private var delegateReferences: [NSObject] = []
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// MARK: - RecordingDelegateWithCallback
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class RecordingDelegateWithCallback: NSObject, AVCaptureFileOutputRecordingDelegate {
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// MARK: Lifecycle
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init(callback: @escaping RCTResponseSenderBlock, resetTorchMode: @escaping () -> Void) {
self.callback = callback
self.resetTorchMode = resetTorchMode
super.init()
delegateReferences.append(self)
}
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// MARK: Internal
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func fileOutput(_ output: AVCaptureFileOutput, didFinishRecordingTo outputFileURL: URL, from _: [AVCaptureConnection], error: Error?) {
defer {
self.resetTorchMode()
delegateReferences.removeAll(where: { $0 == self })
}
if let error = error as NSError? {
return callback([NSNull(), makeReactError(.capture(.unknown(message: error.description)), cause: error)])
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}
let seconds = CMTimeGetSeconds(output.recordedDuration)
return callback([["path": outputFileURL.absoluteString, "duration": seconds, "size": output.recordedFileSize], NSNull()])
}
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// MARK: Private
private let callback: RCTResponseSenderBlock // (video?, error?) => void
private let resetTorchMode: () -> Void
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}