60 lines
2.1 KiB
Swift
60 lines
2.1 KiB
Swift
//
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// HomeMenuIconFactory.swift
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// suixinkan
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//
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import UIKit
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/// 首页 / 全部功能菜单图标加载，统一 SF Symbol 与资源图的视觉尺寸。
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enum HomeMenuIconFactory {
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/// 菜单图标统一使用的逻辑画布尺寸。
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static let canvasSize = CGSize(width: 24, height: 24)
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/// 与菜单图标槽位（约 24–26pt）对齐的系统图标配置。
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static let symbolConfiguration = UIImage.SymbolConfiguration(pointSize: 18, weight: .medium)
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private static let imageCache = NSCache<NSString, UIImage>()
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/// 优先加载 Assets 资源图并归一化画布；SF Symbol 保留系统符号表示与分层渲染。
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static func image(named iconName: String) -> UIImage? {
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let cacheKey = iconName as NSString
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if let cachedImage = imageCache.object(forKey: cacheKey) {
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return cachedImage
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}
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let image: UIImage?
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if let assetImage = UIImage(named: iconName) {
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image = renderOnFixedCanvas(assetImage)
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} else {
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image = UIImage(systemName: iconName, withConfiguration: symbolConfiguration)
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}
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if let image {
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imageCache.setObject(image, forKey: cacheKey)
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}
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return image
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}
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private static func renderOnFixedCanvas(_ image: UIImage) -> UIImage {
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let sourceSize = image.size
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guard sourceSize.width > 0, sourceSize.height > 0 else {
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return image
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}
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let scale = min(canvasSize.width / sourceSize.width, canvasSize.height / sourceSize.height)
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let drawSize = CGSize(width: sourceSize.width * scale, height: sourceSize.height * scale)
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let drawRect = CGRect(
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x: (canvasSize.width - drawSize.width) / 2,
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y: (canvasSize.height - drawSize.height) / 2,
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width: drawSize.width,
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height: drawSize.height
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)
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let renderer = UIGraphicsImageRenderer(size: canvasSize)
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let renderedImage = renderer.image { _ in
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image.withRenderingMode(.alwaysOriginal).draw(in: drawRect)
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}
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return renderedImage.withRenderingMode(.alwaysTemplate)
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}
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}
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