mirror of
https://github.com/vector-im/element-ios.git
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270 lines
8.6 KiB
Swift
270 lines
8.6 KiB
Swift
/*
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Copyright 2020 New Vector Ltd
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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import UIKit
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import ZXingObjC
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protocol QRCodeReaderViewControllerDelegate: class {
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func qrCodeReaderViewController(_ viewController: QRCodeReaderViewController, didFound payloadData: Data)
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func qrCodeReaderViewControllerDidCancel(_ viewController: QRCodeReaderViewController)
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}
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/// QRCodeReaderViewController is a view controller used to scan a QR code
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/// Some methods are based on [ZXing sample](https://github.com/zxingify/zxingify-objc/blob/master/examples/BarcodeScannerSwift/BarcodeScannerSwift/ViewController.swift)
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final class QRCodeReaderViewController: UIViewController {
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// MARK: - Constants
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// MARK: - Properties
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// MARK: Outlets
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@IBOutlet private weak var closeButton: CloseButton!
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@IBOutlet private weak var codeReaderContainerView: UIView!
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// MARK: Private
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private var theme: Theme!
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private var errorPresenter: MXKErrorPresentation!
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private lazy var zxCapture: ZXCapture = ZXCapture()
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private var captureSizeTransform: CGAffineTransform?
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private var isScanning: Bool = false
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private var isFirstApplyOrientation: Bool = false
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// MARK: Public
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weak var delegate: QRCodeReaderViewControllerDelegate?
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// MARK: - Setup
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class func instantiate() -> QRCodeReaderViewController {
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let viewController = StoryboardScene.QRCodeReaderViewController.initialScene.instantiate()
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viewController.theme = ThemeService.shared().theme
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return viewController
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}
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deinit {
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self.stopScanning()
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}
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// MARK: - Life cycle
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override func viewDidLoad() {
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super.viewDidLoad()
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// Do any additional setup after loading the view.
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self.setupViews()
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self.errorPresenter = MXKErrorAlertPresentation()
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self.registerThemeServiceDidChangeThemeNotification()
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self.update(theme: self.theme)
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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self.startScanning()
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}
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override public func viewWillDisappear(_ animated: Bool) {
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self.stopScanning()
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super.viewWillDisappear(animated)
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}
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override var preferredStatusBarStyle: UIStatusBarStyle {
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return self.theme.statusBarStyle
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}
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override func viewDidLayoutSubviews() {
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super.viewDidLayoutSubviews()
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guard isFirstApplyOrientation == false else {
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return
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}
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isFirstApplyOrientation = true
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applyOrientation()
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}
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override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
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super.viewWillTransition(to: size, with: coordinator)
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coordinator.animate(alongsideTransition: { (context) in
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// do nothing
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}, completion: { [weak self] (context) in
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guard let self = self else {
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return
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}
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self.applyOrientation()
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})
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}
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// MARK: - Public
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func startScanning() {
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self.zxCapture.start()
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isScanning = true
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}
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func stopScanning() {
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self.zxCapture.stop()
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isScanning = false
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}
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// MARK: - Private
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private func update(theme: Theme) {
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self.theme = theme
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self.closeButton.update(theme: theme)
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}
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private func registerThemeServiceDidChangeThemeNotification() {
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NotificationCenter.default.addObserver(self, selector: #selector(themeDidChange), name: .themeServiceDidChangeTheme, object: nil)
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}
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@objc private func themeDidChange() {
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self.update(theme: ThemeService.shared().theme)
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}
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private func setupViews() {
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self.setupQRCodeReaderView()
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}
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private func setupQRCodeReaderView() {
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zxCapture.delegate = self
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zxCapture.camera = zxCapture.back()
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zxCapture.layer.frame = codeReaderContainerView.bounds
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codeReaderContainerView.layer.addSublayer(zxCapture.layer)
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}
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private func applyOrientation() {
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let orientation = UIApplication.shared.statusBarOrientation
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let captureRotation: Double
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let scanRectRotation: Double
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switch orientation {
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case .portrait:
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captureRotation = 0
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scanRectRotation = 90
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case .landscapeLeft:
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captureRotation = 90
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scanRectRotation = 180
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case .landscapeRight:
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captureRotation = 270
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scanRectRotation = 0
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case .portraitUpsideDown:
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captureRotation = 180
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scanRectRotation = 270
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default:
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captureRotation = 0
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scanRectRotation = 90
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}
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applyRectOfInterest(orientation: orientation)
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let angleRadius = captureRotation / 180.0 * Double.pi
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let captureTranform = CGAffineTransform(rotationAngle: CGFloat(angleRadius))
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zxCapture.transform = captureTranform
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zxCapture.rotation = CGFloat(scanRectRotation)
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zxCapture.layer.frame = codeReaderContainerView.frame
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}
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private func applyRectOfInterest(orientation: UIInterfaceOrientation) {
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guard var transformedVideoRect = codeReaderContainerView?.frame,
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let cameraSessionPreset = zxCapture.sessionPreset
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else { return }
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var scaleVideoX, scaleVideoY: CGFloat
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var videoHeight, videoWidth: CGFloat
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// Currently support only for 1920x1080 || 1280x720
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if cameraSessionPreset == AVCaptureSession.Preset.hd1920x1080.rawValue {
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videoHeight = 1080.0
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videoWidth = 1920.0
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} else {
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videoHeight = 720.0
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videoWidth = 1280.0
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}
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if orientation == UIInterfaceOrientation.portrait {
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scaleVideoX = self.view.frame.width / videoHeight
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scaleVideoY = self.view.frame.height / videoWidth
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// Convert CGPoint under portrait mode to map with orientation of image
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// because the image will be cropped before rotate
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// reference: https://github.com/TheLevelUp/ZXingObjC/issues/222
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let realX = transformedVideoRect.origin.y
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let realY = self.view.frame.size.width - transformedVideoRect.size.width - transformedVideoRect.origin.x
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let realWidth = transformedVideoRect.size.height
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let realHeight = transformedVideoRect.size.width
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transformedVideoRect = CGRect(x: realX, y: realY, width: realWidth, height: realHeight)
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} else {
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scaleVideoX = self.view.frame.width / videoWidth
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scaleVideoY = self.view.frame.height / videoHeight
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}
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captureSizeTransform = CGAffineTransform(scaleX: 1.0/scaleVideoX, y: 1.0/scaleVideoY)
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guard let _captureSizeTransform = captureSizeTransform else {
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return
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}
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let transformRect = transformedVideoRect.applying(_captureSizeTransform)
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zxCapture.scanRect = transformRect
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}
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// MARK: - Actions
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@IBAction private func closeButtonAction(_ sender: Any) {
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self.delegate?.qrCodeReaderViewControllerDidCancel(self)
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}
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}
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// MARK: - ZXCaptureDelegate
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extension QRCodeReaderViewController: ZXCaptureDelegate {
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func captureCameraIsReady(_ capture: ZXCapture!) {
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isScanning = true
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}
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func captureResult(_ capture: ZXCapture!, result: ZXResult!) {
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guard let zxResult = result, isScanning == true else {
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return
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}
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guard zxResult.barcodeFormat == kBarcodeFormatQRCode else {
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return
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}
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self.stopScanning()
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if let bytes = result.resultMetadata.object(forKey: kResultMetadataTypeByteSegments.rawValue) as? NSArray,
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let byteArray = bytes.firstObject as? ZXByteArray {
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let data = Data(bytes: UnsafeRawPointer(byteArray.array), count: Int(byteArray.length))
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self.delegate?.qrCodeReaderViewController(self, didFound: data)
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}
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}
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}
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