Simplifying Font Picker for Text Annotation using Swift for iOS

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//
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//  Copyright © 2021-2025 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 SimpleFontPickerExample: Example {
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    override init() {
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        super.init()
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        title = "Simple Font Picker"
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        contentDescription = "Shows how to limit the choices of fonts in the font picker."
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        category = .viewCustomization
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    }
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    override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController? {
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        let freeTextAnnotation = FreeTextAnnotation(contents: "This is a test free-text annotation.")
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        freeTextAnnotation.fillColor = .white
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        freeTextAnnotation.fontSize = 30
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        freeTextAnnotation.boundingBox = CGRect(x: 300, y: 300, width: 150, height: 150)
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        freeTextAnnotation.sizeToFit()
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        let document = AssetLoader.writableDocument(for: .annualReport, overrideIfExists: true)
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        document.add(annotations: [freeTextAnnotation])
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        return PDFViewController(document: document) { builder in
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            builder.overrideClass(FontPickerViewController.self, with: SimpleFontPickerViewController.self)
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        }
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    }
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}
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private class SimpleFontPickerViewController: FontPickerViewController {
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    private static let defaultFontFamilyDescriptors: [UIFontDescriptor] = {
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        ["Arial", "Calibri", "Times New Roman", "Courier New", "Helvetica", "Comic Sans MS"].map {
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            UIFontDescriptor(fontAttributes: [.name: $0])
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        }
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    }()
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    override init(fontFamilyDescriptors: [UIFontDescriptor]?) {
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        super.init(fontFamilyDescriptors: fontFamilyDescriptors ?? Self.defaultFontFamilyDescriptors)
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        showDownloadableFonts = false
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        searchEnabled = false
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    }
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    required init?(coder: NSCoder) {
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        fatalError("init(coder:) has not been implemented")
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    }
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}