Customize iOS annotation inspector color presets

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//
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//  Copyright © 2016-2025 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 PresetCustomizationExample: Example, PDFViewControllerDelegate {
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    override init() {
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        super.init()
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        title = "Preset Customization Example"
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        contentDescription = "Shows how to override default color presets."
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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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        // Configure custom default presets.
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        let presets = [
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            ColorPreset(color: UIColor.black),
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            ColorPreset(color: UIColor.red),
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            ColorPreset(color: UIColor.orange),
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            ColorPreset(color: UIColor.blue),
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            ColorPreset(color: UIColor.purple)
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        ]
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        let styleManager = SDK.shared.styleManager
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        let key = Annotation.ToolVariantID(tool: .line)
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        styleManager.setDefaultPresets(presets, forKey: key, type: .colorPreset)
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        // NOTE: Users can change the styles in the inspector unless you change
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        // PSPDFAnnotationStyleViewControllerDelegate.persistsColorPresetChanges.
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        // Setup controller
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        let document = AssetLoader.document(for: .welcome)
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        // Add a sample line
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        let line = LineAnnotation(point1: CGPoint(x: 50, y: 50), point2: CGPoint(x: 200, y: 200))
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        document.add(annotations: [line])
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        let pdfController = PDFViewController(document: document, delegate: self)
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        return pdfController
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    }
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    // MARK: PDFViewControllerDelegate
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    internal func pdfViewController(_ pdfController: PDFViewController, didConfigurePageView pageView: PDFPageView, forPageAt pageIndex: Int) {
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        // Preselect the line.
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        if pageView.pageIndex == 0 {
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            pageView.selectedAnnotations = pdfController.document?.annotationsForPage(at: 0, type: .line)
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        }
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    }
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    func pdfViewControllerDidDismiss(_ pdfController: PDFViewController) {
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        // Restore default presets to not affect other examples.
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        let styleManager = SDK.shared.styleManager
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        let key = Annotation.ToolVariantID(tool: .line)
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        styleManager.setDefaultPresets(nil, forKey: key, type: .colorPreset)
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    }
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}