feat: support 0x prefix and alpha value on the frontend

Sources/Core/DynamicColor.swift

@@ -46,6 +46,35 @@
 
 public extension DynamicColor {
   // MARK: - Manipulating Hexa-decimal Values and Strings
+
+
+    /**
+     Creates a color from an hex string (e.g. "#3498db"). The RGBA string are also supported (e.g. "#ff3498db"). ff is alpha
+
+     support (0x3498db)
+
+     If the given hex string is invalid the initialiser will create a black color.
+
+     - parameter hexString: A hexa-decimal color string representation.
+     */
+    convenience init(_ hexString: String, alphaInFront front: Bool = true) {
+        var hexString = hexString.trimmingCharacters(in: .whitespacesAndNewlines)
+        if hexString.hasPrefix("0x"){
+          hexString = hexString.removingPrefixes(["0x"])
+        }
+
+        if hexString.hasPrefix("#"){
+          hexString = hexString.removingPrefixes(["#"])
+        }
+
+        if hexString.count > 7 && front {
+            let prefix = String(hexString.prefix(2))  // 获取最前面的两个字符
+            let middle = String(hexString.dropFirst(2))  // 获取中间的部分
+            hexString = middle + prefix  // 重新组合字符串
+        }
+        self.init(hexString: hexString)
+    }
+
 
   /**
    Creates a color from an hex string (e.g. "#3498db"). The RGBA string are also supported (e.g. "#3498dbff").
@@ -224,3 +253,12 @@ public extension DynamicColor {
     return self.contrastRatio(with: otherColor) > context.minimumContrastRatio
   }
 }
+
+extension String{
+
+    public func removingPrefixes(_ prefixes: [String]) -> String {
+        let pattern = "^(\(prefixes.map{"\\Q"+$0+"\\E"}.joined(separator: "|")))\\s?"
+        guard let range = self.range(of: pattern, options: [.regularExpression, .caseInsensitive]) else { return self }
+        return String(self[range.upperBound...])
+    }
+}