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Handle camera permission for web image file input
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| // | |
| // WebWithCameraViewController.swift | |
| // | |
| // Created by Vitaly Berg on 3/20/24. | |
| // | |
| import UIKit | |
| import WebKit | |
| import AVFoundation | |
| let html = """ | |
| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <meta name="viewport" content="width=device-width, initial-scale=1"> | |
| </head> | |
| <body style="padding: 20px"> | |
| <input type="file" accept="image/*" /> | |
| </body> | |
| </html> | |
| """ | |
| class WebWithCameraViewController: UIViewController { | |
| private var webView: WKWebView! | |
| // MARK: - UIViewController | |
| override func viewDidLoad() { | |
| super.viewDidLoad() | |
| webView = WKWebView() | |
| webView.translatesAutoresizingMaskIntoConstraints = false | |
| view.addSubview(webView) | |
| NSLayoutConstraint.activate([ | |
| webView.topAnchor.constraint(equalTo: view.topAnchor), | |
| webView.leftAnchor.constraint(equalTo: view.leftAnchor), | |
| webView.rightAnchor.constraint(equalTo: view.rightAnchor), | |
| webView.bottomAnchor.constraint(equalTo: view.bottomAnchor) | |
| ]) | |
| webView.loadHTMLString(html, baseURL: nil) | |
| } | |
| override func viewWillDisappear(_ animated: Bool) { | |
| super.viewWillDisappear(animated) | |
| if let imagePickerVC = presentedViewController as? UIImagePickerController { | |
| if imagePickerVC.sourceType != .camera { | |
| // Optional checking, system not use it to pick photos, instead it uses PHPickerViewController | |
| return | |
| } | |
| let status = AVCaptureDevice.authorizationStatus(for: .video) | |
| switch status { | |
| case .notDetermined: | |
| // Request permissions by UIImagePickerController | |
| break | |
| case .authorized: | |
| // All good! | |
| break | |
| case .restricted: | |
| // Sometimes when restricted by parental controls | |
| showRestricted(for: imagePickerVC) | |
| case .denied: | |
| // User denied | |
| showDenied(for: imagePickerVC); | |
| @unknown default: | |
| break | |
| } | |
| } | |
| } | |
| private func showDenied(for imagePickerVC: UIImagePickerController) { | |
| showPermissionsAlert(for: imagePickerVC, restricted: false) | |
| } | |
| private func showRestricted(for imagePickerVC: UIImagePickerController) { | |
| showPermissionsAlert(for: imagePickerVC, restricted: true) | |
| } | |
| private var useCustomPermissionsView = false | |
| private func showPermissionsAlert(for imagePickerVC: UIImagePickerController, restricted: Bool) { | |
| // First option with modifing camera screen | |
| if useCustomPermissionsView { | |
| if let overlayView = imagePickerVC.cameraOverlayView { | |
| // TODO: don't want to create good example | |
| let customView = UIView(frame: overlayView.bounds) | |
| customView.autoresizingMask = [.flexibleWidth, .flexibleHeight] | |
| customView.backgroundColor = .black | |
| overlayView.addSubview(customView) | |
| let label = UILabel(frame: customView.bounds) | |
| label.autoresizingMask = [.flexibleWidth, .flexibleHeight] | |
| label.font = .systemFont(ofSize: 100, weight: .bold) | |
| label.text = ":(" | |
| label.textAlignment = .center | |
| label.textColor = .white | |
| customView.addSubview(label) | |
| let button = UIButton(type: .system) | |
| button.setTitle("Dismiss", for: .normal) | |
| button.addAction(.init(handler: { [weak self] _ in | |
| self?.dismissImagePicker(imagePickerVC) | |
| }), for: .touchUpInside) | |
| button.tintColor = .white | |
| button.translatesAutoresizingMaskIntoConstraints = false | |
| customView.addSubview(button) | |
| button.centerXAnchor.constraint(equalTo: customView.centerXAnchor).isActive = true | |
| button.bottomAnchor.constraint(equalTo: customView.safeAreaLayoutGuide.bottomAnchor, constant: -20).isActive = true | |
| return | |
| } | |
| } | |
| // Second option with alert and fallback in case of first option | |
| let alertVC = UIAlertController(title: "No Permissions", message: "Something about that need enable permissions", preferredStyle: .alert) | |
| if restricted { | |
| // TODO: handle a little different than denied, for example change message and open settings app | |
| alertVC.addAction(.init(title: "Open Settings", style: .default, handler: { [weak self] _ in | |
| self?.dismissImagePicker(imagePickerVC) | |
| })) | |
| } else { | |
| alertVC.addAction(.init(title: "Open App Settings", style: .default, handler: { [weak self] _ in | |
| self?.dismissImagePicker(imagePickerVC) | |
| UIApplication.shared.open(URL(string: UIApplication.openSettingsURLString)!) | |
| })) | |
| } | |
| alertVC.addAction(.init(title: "Ok", style: .cancel, handler: { [weak self] _ in | |
| self?.dismissImagePicker(imagePickerVC) | |
| })) | |
| imagePickerVC.present(alertVC, animated: true) | |
| } | |
| // It just dismisses picker. Context menu on input will be unaviable if just dismiss without delegate invoking. | |
| private func dismissImagePicker(_ imagePickerVC: UIImagePickerController) { | |
| if imagePickerVC.delegate?.imagePickerControllerDidCancel != nil { | |
| imagePickerVC.delegate?.imagePickerControllerDidCancel?(imagePickerVC) | |
| } else { | |
| // Fallback | |
| imagePickerVC.dismiss(animated: true) | |
| } | |
| } | |
| } |
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