Add custom font sizes to free text keyboard in Swift for iOS

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//
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//  Copyright © 2019-2026 PSPDFKit GmbH. All rights reserved.
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//
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//  The Nutrient sample applications are licensed with a modified BSD license.
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//  Please see License for details. This notice may not be removed from this file.
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//
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import PSPDFKit
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import PSPDFKitUI
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class CustomFontSizeButtonsFreeTextAccessoryViewExample: Example {
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    override init() {
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        super.init()
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        title = "Customizing the Buttons for the Free Text inputAccessory"
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        contentDescription = "Add custom font size buttons to free text accessory view"
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        category = .annotations
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        priority = 150
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController {
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        let document = AssetLoader.document(for: .welcome)
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        let controller = PDFViewController(document: document) {
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            $0.overrideClass(FreeTextAccessoryView.self, with: CustomFontSizeButtonsFreeTextAccessoryView.self)
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        }
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        return controller
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    }
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}
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private class CustomFontSizeButtonsFreeTextAccessoryView: FreeTextAccessoryView {
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    lazy var tenPointButton: ToolbarButton = {
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        let button = ToolbarButton()
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        button.length = 150
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        button.setTitle("10pt", for: .normal)
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        button.addTarget(self, action: #selector(self.tenPointButtonTapped), for: .touchUpInside)
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        return button
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    }()
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    lazy var thirtyPointButton: ToolbarButton = {
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        let button = ToolbarButton()
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        button.length = 150
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        button.setTitle("30pt", for: .normal)
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        button.addTarget(self, action: #selector(self.thirtyPointButtonTapped), for: .touchUpInside)
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        return button
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    }()
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    lazy var fiftyPointButton: ToolbarButton = {
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        let button = ToolbarButton()
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        button.length = 150
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        button.setTitle("50pt", for: .normal)
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        button.addTarget(self, action: #selector(self.fiftyPointButtonTapped), for: .touchUpInside)
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        return button
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    }()
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    @objc func tenPointButtonTapped(sender: ToolbarButton) {
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        setFontSize(to: 10)
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    }
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    @objc func thirtyPointButtonTapped(sender: ToolbarButton) {
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        setFontSize(to: 30)
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    }
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    @objc func fiftyPointButtonTapped(sender: ToolbarButton) {
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        setFontSize(to: 50)
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    }
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    private func setFontSize(to fontSize: CGFloat) {
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        annotation.fontSize = fontSize
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        let propertyKeyPath = "fontSize"
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        let userInfo = [PSPDFAnnotationChangedNotificationKeyPathKey: [propertyKeyPath]]
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        NotificationCenter.default.post(name: .PSPDFAnnotationChanged, object: annotation, userInfo: userInfo)
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        self.delegate?.freeTextAccessoryView?(self, didChangeProperty: propertyKeyPath)
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    }
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    override func buttons(forWidth width: CGFloat) -> [ToolbarButton] {
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        return [tenPointButton, thirtyPointButton, fiftyPointButton, fontNameButton, doneButton]
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    }
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}