fix: 固定首页常用应用图标尺寸

2026-07-16 19:02:00 +08:00
parent 5f1c22c6a8
commit 3d5ad8a614
4 changed files with 104 additions and 26 deletions
@@ -8,14 +8,49 @@ import UIKit
 /// 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。
 enum HomeMenuIconFactory {

+    /// 菜单图标统一使用的逻辑画布尺寸。
+    static let canvasSize = CGSize(width: 24, height: 24)
+
    /// 与菜单图标槽位（约 24–26pt）对齐的系统图标配置。
    static let symbolConfiguration = UIImage.SymbolConfiguration(pointSize: 18, weight: .medium)

-    /// 优先加载 Assets 资源图；否则按统一配置加载 SF Symbol。
+    private static let imageCache = NSCache<NSString, UIImage>()
+
+    /// 优先加载 Assets 资源图；否则加载 SF Symbol，并统一渲染到固定画布。
    static func image(named iconName: String) -> UIImage? {
-        if let asset = UIImage(named: iconName) {
-            return asset
+        let cacheKey = iconName as NSString
+        if let cachedImage = imageCache.object(forKey: cacheKey) {
+            return cachedImage
        }
-        return UIImage(systemName: iconName, withConfiguration: symbolConfiguration)
+
+        guard let sourceImage = UIImage(named: iconName)
+            ?? UIImage(systemName: iconName, withConfiguration: symbolConfiguration) else {
+            return nil
+        }
+
+        let normalizedImage = renderOnFixedCanvas(sourceImage)
+        imageCache.setObject(normalizedImage, forKey: cacheKey)
+        return normalizedImage
+    }
+
+    private static func renderOnFixedCanvas(_ image: UIImage) -> UIImage {
+        let sourceSize = image.size
+        guard sourceSize.width > 0, sourceSize.height > 0 else {
+            return image
+        }
+
+        let scale = min(canvasSize.width / sourceSize.width, canvasSize.height / sourceSize.height)
+        let drawSize = CGSize(width: sourceSize.width * scale, height: sourceSize.height * scale)
+        let drawRect = CGRect(
+            x: (canvasSize.width - drawSize.width) / 2,
+            y: (canvasSize.height - drawSize.height) / 2,
+            width: drawSize.width,
+            height: drawSize.height
+        )
+        let renderer = UIGraphicsImageRenderer(size: canvasSize)
+        let renderedImage = renderer.image { _ in
+            image.withRenderingMode(.alwaysOriginal).draw(in: drawRect)
+        }
+        return renderedImage.withRenderingMode(.alwaysTemplate)
    }
 }