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							|  |  | final class KeyPairMigrationSheet : Sheet {
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							|  |  |     override class var isDismissable: Bool { false }
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							|  |  |     
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							|  |  |     override func populateContentView() {
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							|  |  |         // Image view
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							|  |  |         let imageView = UIImageView(image: #imageLiteral(resourceName: "Shield").withTint(Colors.text))
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							|  |  |         imageView.set(.width, to: 64)
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							|  |  |         imageView.set(.height, to: 64)
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							|  |  |         imageView.contentMode = .scaleAspectFit
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							|  |  |         // Title label
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							|  |  |         let titleLabel = UILabel()
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							|  |  |         titleLabel.textColor = Colors.text
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							|  |  |         titleLabel.font = .boldSystemFont(ofSize: isIPhone5OrSmaller ? Values.largeFontSize : Values.veryLargeFontSize)
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							|  |  |         titleLabel.text = "Session IDs Just Got Better"
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							|  |  |         titleLabel.textAlignment = .center
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							|  |  |         titleLabel.numberOfLines = 0
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							|  |  |         titleLabel.lineBreakMode = .byWordWrapping
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							|  |  |         // Top stack view
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							|  |  |         let topStackView = UIStackView(arrangedSubviews: [ imageView, titleLabel ])
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							|  |  |         topStackView.axis = .vertical
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							|  |  |         topStackView.spacing = Values.largeSpacing
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							|  |  |         topStackView.alignment = .center
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							|  |  |         // Explanation label
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							|  |  |         let explanationLabel = UILabel()
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							|  |  |         explanationLabel.textColor = Colors.text
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							|  |  |         explanationLabel.font = .systemFont(ofSize: Values.smallFontSize)
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							|  |  |         explanationLabel.textAlignment = .center
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							|  |  |         explanationLabel.text = """
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							|  |  |         We’ve upgraded Session IDs to make them even more private and secure. To ensure your continued privacy you're now required to upgrade.
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							|  |  | 
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							|  |  |         Your existing contacts and conversations will be lost, but you’ll be able to use Session knowing you have the best privacy and security possible.
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							|  |  |         """
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							|  |  |         explanationLabel.numberOfLines = 0
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							|  |  |         explanationLabel.lineBreakMode = .byWordWrapping
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							|  |  |         // Upgrade now button
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							|  |  |         let upgradeNowButton = Button(style: .prominentOutline, size: .large)
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							|  |  |         upgradeNowButton.set(.width, to: 240)
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							|  |  |         upgradeNowButton.setTitle("Upgrade Now", for: UIControl.State.normal)
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							|  |  |         upgradeNowButton.addTarget(self, action: #selector(upgradeNow), for: UIControl.Event.touchUpInside)
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							|  |  |         // Upgrade now button
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							|  |  |         let upgradeLaterButton = Button(style: .prominentOutline, size: .large)
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							|  |  |         upgradeLaterButton.set(.width, to: 240)
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							|  |  |         upgradeLaterButton.setTitle("Upgrade Later", for: UIControl.State.normal)
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							|  |  |         upgradeLaterButton.addTarget(self, action: #selector(upgradeLater), for: UIControl.Event.touchUpInside)
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							|  |  |         // Button stack view
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							|  |  |         let buttonStackView = UIStackView(arrangedSubviews: [ upgradeNowButton, upgradeLaterButton ])
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							|  |  |         buttonStackView.axis = .vertical
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							|  |  |         buttonStackView.spacing = Values.mediumSpacing
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							|  |  |         buttonStackView.alignment = .center
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							|  |  |         // Main stack view
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							|  |  |         let stackView = UIStackView(arrangedSubviews: [ topStackView, explanationLabel, buttonStackView ])
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							|  |  |         stackView.axis = .vertical
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							|  |  |         stackView.spacing = Values.veryLargeSpacing
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							|  |  |         stackView.alignment = .center
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							|  |  |         // Constraints
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							|  |  |         contentView.addSubview(stackView)
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							|  |  |         stackView.pin(.leading, to: .leading, of: contentView, withInset: Values.veryLargeSpacing)
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							|  |  |         stackView.pin(.top, to: .top, of: contentView, withInset: Values.largeSpacing)
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							|  |  |         contentView.pin(.trailing, to: .trailing, of: stackView, withInset: Values.veryLargeSpacing)
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							|  |  |         contentView.pin(.bottom, to: .bottom, of: stackView, withInset: Values.veryLargeSpacing + overshoot)
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							|  |  |     }
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							|  |  |     
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							|  |  |     @objc private func upgradeNow() {
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							|  |  |         Storage.prepareForV2KeyPairMigration()
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							|  |  |     }
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							|  |  |     
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							|  |  |     @objc private func upgradeLater() {
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							|  |  |         let alert = UIAlertController(title: "Warning", message: "You won't be able to send or receive messages until you upgrade.", preferredStyle: .alert)
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							|  |  |         alert.addAction(UIAlertAction(title: "OK", accessibilityIdentifier: nil, style: .default, handler: nil))
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							|  |  |         presentingViewController?.dismiss(animated: true, completion: nil) // Dismiss self
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							|  |  |         presentingViewController?.present(alert, animated: true, completion: nil)
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							|  |  |     }
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							|  |  | }
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