Customize Comment Font Size in PDF 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 LargeNoteControllerFontExample: Example {
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    override init() {
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        super.init()
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        title = "Custom Font for Comments"
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        contentDescription = "Shows how to customize the font for comments in the NoteAnnotationViewController."
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        category = .viewCustomization
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        priority = 89
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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 pdfController = PDFViewController(document: document) {
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            $0.overrideClass(NoteAnnotationViewController.self, with: LargeFontNoteAnnotationViewController.self)
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        }
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        // We create the appearance rule on the custom subclass to avoid changing the note controllers in other examples.
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        UITextView.appearance(whenContainedInInstancesOf: [LargeFontNoteAnnotationViewController.self]).font = UIFont(name: "Noteworthy", size: 30)
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        UITextView.appearance(whenContainedInInstancesOf: [LargeFontNoteAnnotationViewController.self]).textColor = UIColor.systemGreen
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        return pdfController
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    }
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}
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// Custom empty subclass of the NoteAnnotationViewController to avoid polluting other examples, since UIAppearance can't be reset to the default.
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private class LargeFontNoteAnnotationViewController: NoteAnnotationViewController {
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    override func update(_ textView: UITextView) {
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        // Possible to set the color here, but it's even cleaner to use UIAppearance rules (see above).
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        // textView.font = UIFont(name: "Futura", size: 40)
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        // textView.textColor = .brown
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    }
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}