90 lines
3.3 KiB
Swift
90 lines
3.3 KiB
Swift
//
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// Copyright (c) 2019 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import UIKit
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import AVFoundation
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open class QRCodeReader: BaseReader<AVMetadataMachineReadableCodeObject>, AVCaptureMetadataOutputObjectsDelegate {
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private let metadataObjectsQueue = DispatchQueue(label: "qr_metadata_objects_queue", attributes: [], target: nil)
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let metadataOutput = AVCaptureMetadataOutput()
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// MARK: - Private Methods
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override func configureDefaultComponents() {
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for output in session.outputs {
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session.removeOutput(output)
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}
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for input in session.inputs {
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session.removeInput(input)
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}
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if let defaultDeviceInput = defaultDeviceInput {
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session.addInput(defaultDeviceInput)
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}
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session.addOutput(metadataOutput)
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metadataOutput.setMetadataObjectsDelegate(self, queue: metadataObjectsQueue)
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metadataOutput.metadataObjectTypes = [.qr, .aztec, .dataMatrix]
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previewLayer.videoGravity = .resizeAspectFill
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session.commitConfiguration()
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}
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// MARK: - AVCaptureMetadataOutputObjectsDelegate
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public func metadataOutput(_ output: AVCaptureMetadataOutput,
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didOutput metadataObjects: [AVMetadataObject],
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from connection: AVCaptureConnection) {
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sessionQueue.async { [weak self] in
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guard let self = self else {
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return
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}
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for current in metadataObjects {
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if let readableCodeObject = current as? AVMetadataMachineReadableCodeObject,
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readableCodeObject.stringValue != nil {
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guard self.session.isRunning else {
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return
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}
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if self.stopScanningWhenCodeIsFound {
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self.session.stopRunning()
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}
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DispatchQueue.main.async {
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self.didFind?(readableCodeObject)
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}
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} else {
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DispatchQueue.main.async {
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self.didFailDecoding?()
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}
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}
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}
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}
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}
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}
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