4.B SharePanel: 替换字符占位为 imageset 图标

从 docs/res/Images.xcassets 拷贝 shareWechat / shareQQ / shareDouyin
三套 imageset（@1x/@2x/@3x）到 ylgamehall/Assets.xcassets/。SharePanel
按钮从"彩色圆 + 首字"改为 setImage + clipsToBounds + 等比缩放，未安装
平台改 alpha 灰显（与原 daoqi msext SharePanel.m:147 createButtonWithImage
同款写法）。

ylgamehall/ 是 PBXFileSystemSynchronizedRootGroup，无需手改 pbxproj。

ylgamehall/Assets.xcassets/shareDouyin.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "filename" : "shareDouyin.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "shareDouyin@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "shareDouyin@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ylgamehall/Assets.xcassets/shareQQ.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "filename" : "shareQQ.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "shareQQ@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "shareQQ@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ylgamehall/Assets.xcassets/shareWechat.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images" : [
+    {
+      "filename" : "shareWechat.png",
+      "idiom" : "universal",
+      "scale" : "1x"
+    },
+    {
+      "filename" : "shareWechat@2x.png",
+      "idiom" : "universal",
+      "scale" : "2x"
+    },
+    {
+      "filename" : "shareWechat@3x.png",
+      "idiom" : "universal",
+      "scale" : "3x"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}

ylgamehall/Source/Share/SharePanel.swift

@@ -88,23 +88,23 @@ public final class SharePanel: UIView {
         let buttonsContainer = UIView(frame: CGRect(x: 0, y: 30, width: screen.width, height: 110))
         contentView.addSubview(buttonsContainer)
 
-        let buttons: [(title: String, platform: SharePlatform, color: UIColor)] = [
-            ("微信", WechatShare.shared, UIColor(red: 0.06, green: 0.69, blue: 0.36, alpha: 1)),
-            ("QQ",   QQShare.shared,     UIColor(red: 0.12, green: 0.51, blue: 0.97, alpha: 1)),
-            ("抖音", DouyinShare.shared, .black)
+        let buttons: [(title: String, platform: SharePlatform, imageName: String)] = [
+            ("微信", WechatShare.shared, "shareWechat"),
+            ("QQ",   QQShare.shared,     "shareQQ"),
+            ("抖音", DouyinShare.shared, "shareDouyin")
         ]
 
         let totalButtonsWidth = Self.buttonSize * CGFloat(buttons.count)
         let spacing = (screen.width - totalButtonsWidth) / CGFloat(buttons.count + 1)
         for (index, b) in buttons.enumerated() {
             let x = spacing + CGFloat(index) * (Self.buttonSize + spacing)
-            let button = UIButton(type: .system)
+            let button = UIButton(type: .custom)
             button.frame = CGRect(x: x, y: 0, width: Self.buttonSize, height: Self.buttonSize)
-            button.backgroundColor = b.platform.isInstalled ? b.color : .lightGray
+            button.setImage(UIImage(named: b.imageName), for: .normal)
+            button.imageView?.contentMode = .scaleAspectFit
             button.layer.cornerRadius = Self.buttonSize / 2
-            button.setTitle(b.title.prefix(1).description, for: .normal)
-            button.setTitleColor(.white, for: .normal)
-            button.titleLabel?.font = .systemFont(ofSize: 22, weight: .medium)
+            button.clipsToBounds = true
+            button.alpha = b.platform.isInstalled ? 1.0 : 0.4
             button.tag = index
             button.addTarget(self, action: #selector(handleButtonTap(_:)), for: .touchUpInside)
             buttonsContainer.addSubview(button)