Add text recognition image description for image attachments
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6e27399e10
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94A5AB95422746E5
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@ -315,6 +315,15 @@ class ComposeAttachmentsViewController: UITableViewController {
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actions.append(UIAction(title: "Edit Drawing", image: UIImage(systemName: "hand.draw"), identifier: nil, discoverabilityTitle: nil, attributes: [], state: .off, handler: { (_) in
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self.presentComposeDrawingViewController(editingAttachmentAt: indexPath.row)
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}))
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case .asset(_), .image(_):
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if attachment.data.type == .image,
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let cell = tableView.cellForRow(at: indexPath) as? ComposeAttachmentTableViewCell {
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let title = NSLocalizedString("Recognize Text", comment: "recognize image attachment text menu item title")
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actions.append(UIAction(title: title, image: UIImage(systemName: "doc.text.viewfinder"), identifier: nil, discoverabilityTitle: nil, attributes: [], state: .off, handler: { (_) in
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cell.recognizeTextFromImage()
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}))
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}
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default:
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break
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}
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@ -503,6 +512,10 @@ extension ComposeAttachmentsViewController: AssetPickerViewControllerDelegate {
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}
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extension ComposeAttachmentsViewController: ComposeAttachmentTableViewCellDelegate {
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func composeAttachment(_ cell: ComposeAttachmentTableViewCell, present viewController: UIViewController, animated: Bool) {
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self.present(viewController, animated: animated)
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}
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func removeAttachment(_ cell: ComposeAttachmentTableViewCell) {
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guard let indexPath = tableView.indexPath(for: cell) else { return }
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attachments.remove(at: indexPath.row)
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@ -9,8 +9,10 @@
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import UIKit
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import Photos
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import AVFoundation
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import Vision
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protocol ComposeAttachmentTableViewCellDelegate: class {
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func composeAttachment(_ cell: ComposeAttachmentTableViewCell, present viewController: UIViewController, animated: Bool)
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func removeAttachment(_ cell: ComposeAttachmentTableViewCell)
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func attachmentDescriptionChanged(_ cell: ComposeAttachmentTableViewCell)
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}
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@ -23,9 +25,27 @@ class ComposeAttachmentTableViewCell: UITableViewCell {
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@IBOutlet weak var descriptionTextView: UITextView!
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@IBOutlet weak var descriptionPlaceholderLabel: UILabel!
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@IBOutlet weak var removeButton: UIButton!
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@IBOutlet weak var activityIndicator: UIActivityIndicatorView!
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var attachment: CompositionAttachment!
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var state: State = .allowEntry {
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didSet {
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switch state {
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case .allowEntry:
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descriptionTextView.isEditable = true
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updateDescriptionPlaceholderLabel()
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activityIndicator.stopAnimating()
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case .recognizingText:
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descriptionTextView.isEditable = false
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descriptionPlaceholderLabel.isHidden = true
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activityIndicator.startAnimating()
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}
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}
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}
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private var textRecognitionRequest: VNRecognizeTextRequest?
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override func awakeFromNib() {
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super.awakeFromNib()
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@ -74,17 +94,69 @@ class ComposeAttachmentTableViewCell: UITableViewCell {
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removeButton.isEnabled = enabled
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}
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func recognizeTextFromImage() {
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precondition(attachment.data.type == .image)
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state = .recognizingText
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DispatchQueue.global(qos: .userInitiated).async {
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self.attachment.data.getData { (data, mimeType) in
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let handler = VNImageRequestHandler(data: data, options: [:])
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let request = VNRecognizeTextRequest { (request, error) in
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DispatchQueue.main.async {
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self.state = .allowEntry
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if let results = request.results as? [VNRecognizedTextObservation] {
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var text = ""
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for observation in results {
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let result = observation.topCandidates(1).first!
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text.append(result.string)
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text.append("\n")
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}
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self.descriptionTextView.text = text
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self.textViewDidChange(self.descriptionTextView)
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}
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}
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}
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request.recognitionLevel = .accurate
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request.usesLanguageCorrection = true
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self.textRecognitionRequest = request
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DispatchQueue.global(qos: .userInitiated).async {
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do {
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try handler.perform([request])
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} catch {
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// The perform call throws an error with code 1 if the request is cancelled, which we don't want to show an alert for.
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guard (error as NSError).code != 1 else { return }
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DispatchQueue.main.async {
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self.state = .allowEntry
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let title = NSLocalizedString("Text Recognition Failed", comment: "text recognition error alert title")
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let message = error.localizedDescription
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let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
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self.delegate?.composeAttachment(self, present: alert, animated: true)
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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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override func prepareForReuse() {
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super.prepareForReuse()
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assetImageView.image = nil
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}
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@IBAction func removeButtonPressed(_ sender: Any) {
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textRecognitionRequest?.cancel()
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delegate?.removeAttachment(self)
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}
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}
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extension ComposeAttachmentTableViewCell {
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enum State {
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case allowEntry, recognizingText
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}
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}
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extension ComposeAttachmentTableViewCell: UITextViewDelegate {
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func textViewDidChange(_ textView: UITextView) {
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attachment.attachmentDescription = textView.text
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@ -57,6 +57,9 @@
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<constraint firstAttribute="height" relation="greaterThanOrEqual" constant="80" id="jWo-An-3h6"/>
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</constraints>
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</stackView>
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<activityIndicatorView hidden="YES" opaque="NO" contentMode="scaleToFill" horizontalHuggingPriority="750" verticalHuggingPriority="750" hidesWhenStopped="YES" style="medium" translatesAutoresizingMaskIntoConstraints="NO" id="Kzy-5r-UW8">
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<rect key="frame" x="179" y="38" width="20" height="20"/>
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</activityIndicatorView>
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</subviews>
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<constraints>
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<constraint firstAttribute="bottom" secondItem="xRe-ec-Coh" secondAttribute="bottom" constant="8" id="DOS-Wv-G3s"/>
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@ -64,12 +67,15 @@
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<constraint firstItem="h6T-x4-yzl" firstAttribute="trailing" secondItem="cwP-Eh-5dJ" secondAttribute="trailing" constant="4" id="KN2-Ve-3B2"/>
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<constraint firstItem="h6T-x4-yzl" firstAttribute="top" secondItem="cwP-Eh-5dJ" secondAttribute="top" constant="8" id="P3B-Jo-XMs"/>
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<constraint firstItem="h6T-x4-yzl" firstAttribute="leading" secondItem="cwP-Eh-5dJ" secondAttribute="leading" constant="4" id="UjP-Gs-ZjO"/>
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<constraint firstItem="Kzy-5r-UW8" firstAttribute="centerX" secondItem="cwP-Eh-5dJ" secondAttribute="centerX" id="czP-Ia-Ddc"/>
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<constraint firstItem="Kzy-5r-UW8" firstAttribute="centerY" secondItem="cwP-Eh-5dJ" secondAttribute="centerY" id="eel-xx-aFq"/>
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<constraint firstItem="xRe-ec-Coh" firstAttribute="leading" secondItem="H2p-sc-9uM" secondAttribute="leading" constant="8" id="gRN-PV-gm6"/>
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<constraint firstAttribute="trailing" secondItem="xRe-ec-Coh" secondAttribute="trailing" constant="8" id="tyE-HK-4qb"/>
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</constraints>
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</tableViewCellContentView>
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<viewLayoutGuide key="safeArea" id="njF-e1-oar"/>
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<connections>
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<outlet property="activityIndicator" destination="Kzy-5r-UW8" id="lmy-NY-Owu"/>
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<outlet property="assetImageView" destination="GLY-o8-47z" id="hZH-ur-m4z"/>
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<outlet property="descriptionPlaceholderLabel" destination="h6T-x4-yzl" id="jBe-R0-Sfn"/>
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<outlet property="descriptionTextView" destination="cwP-Eh-5dJ" id="pxJ-zF-GKC"/>
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