react-native-vision-camera/ios/CameraView+Orientation.swift

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//
// CameraView+Orientation.swift
// VisionCamera
//
// Created by Marc Rousavy on 04.01.22.
// Copyright © 2022 mrousavy. All rights reserved.
//
import Foundation
import UIKit
extension CameraView {
/// Returns the current _interface_ orientation of the main window
private var windowInterfaceOrientation: UIInterfaceOrientation {
if #available(iOS 13.0, *) {
return UIApplication.shared.windows.first?.windowScene?.interfaceOrientation ?? .unknown
} else {
return UIApplication.shared.statusBarOrientation
}
}
/// Orientation of the input connection (preview)
private var inputOrientation: UIInterfaceOrientation {
return windowInterfaceOrientation
}
// Orientation of the output connections (photo, video, frame processor)
private var outputOrientation: UIInterfaceOrientation {
if let userOrientation = orientation as String?,
let parsedOrientation = try? UIInterfaceOrientation(withString: userOrientation) {
// user is overriding output orientation
return parsedOrientation
} else {
// use same as input orientation
return inputOrientation
}
}
internal func updateOrientation() {
// Updates the Orientation for all rotable connections (outputs) as well as for the preview layer
DispatchQueue.main.async {
// `windowInterfaceOrientation` and `videoPreviewLayer` should only be accessed from UI thread
let isMirrored = self.videoDeviceInput?.device.position == .front
self.videoPreviewLayer.connection?.setInterfaceOrientation(self.inputOrientation)
let connectionOrientation = self.outputOrientation
self.cameraQueue.async {
// Run those updates on cameraQueue since they can be blocking.
self.captureSession.outputs.forEach { output in
output.connections.forEach { connection in
if connection.isVideoMirroringSupported {
connection.automaticallyAdjustsVideoMirroring = false
connection.isVideoMirrored = isMirrored
}
connection.setInterfaceOrientation(connectionOrientation)
}
}
}
}
}
}