some UIColor convenience initializers

LeadKit/LeadKit/Extensions/UIColor/UIColor+Hex.swift

@@ -11,21 +11,71 @@ import UIKit
 public extension UIColor {
 
     /**
-     convenience initializer which creates an instance with given hex color values
+     The shorthand three-digit hexadecimal representation of color.
+     #RGB defines to the color #RRGGBB.
 
-     - parameter hex:   hex with red, green and blue values
-     - parameter alpha: alpha component
+     - parameter hex3:  Three-digit hexadecimal value.
+     - parameter alpha: 0.0 - 1.0. The default is 1.0.
 
-     - returns: new instance with given hex color
+     - returns: new instance with given three-digit hexadecimal value
      */
-    public convenience init(hex: UInt32, alpha: CGFloat = 1) {
-        let red   = CGFloat((hex & 0xFF0000) >> 16) / 0xFF
-        let green = CGFloat((hex & 0x00FF00) >>  8) / 0xFF
-        let blue  = CGFloat((hex & 0x0000FF) >>  0) / 0xFF
+    public convenience init(hex3: UInt16, alpha: CGFloat = 1) {
+        let red     = CGFloat((hex3 & 0xF00) >> 8) / 0xFF
+        let green   = CGFloat((hex3 & 0x0F0) >> 4) / 0xFF
+        let blue    = CGFloat((hex3 & 0x00F) >> 0) / 0xFF
+        self.init(red: red, green: green, blue: blue, alpha: alpha)
+    }
+
+    /**
+     The shorthand four-digit hexadecimal representation of color with alpha.
+     #RGBA defines to the color #RRGGBBAA.
+
+     - parameter hex4: Four-digit hexadecimal value.
+
+     - returns: new instance with given four-digit hexadecimal value
+     */
+    public convenience init(hex4: UInt16) {
+        let red     = CGFloat((hex4 & 0xF000) >> 12) / 0xFF
+        let green   = CGFloat((hex4 & 0x0F00) >>  8) / 0xFF
+        let blue    = CGFloat((hex4 & 0x00F0) >>  4) / 0xFF
+        let alpha   = CGFloat((hex4 & 0x000F) >>  0) / 0xFF
 
         self.init(red: red, green: green, blue: blue, alpha: alpha)
     }
 
+    /**
+     The six-digit hexadecimal representation of color of the form #RRGGBB.
+
+     - parameter hex6:  Six-digit hexadecimal value.
+     - parameter alpha: alpha: 0.0 - 1.0. The default is 1.0.
+
+     - returns: new instance with given six-digit hexadecimal value
+     */
+    public convenience init(hex6: UInt32, alpha: CGFloat = 1) {
+        let red     = CGFloat((hex6 & 0xFF0000) >> 16) / 0xFF
+        let green   = CGFloat((hex6 & 0x00FF00) >>  8) / 0xFF
+        let blue    = CGFloat((hex6 & 0x0000FF) >>  0) / 0xFF
+
+        self.init(red: red, green: green, blue: blue, alpha: alpha)
+    }
+
+    /**
+     The six-digit hexadecimal representation of color with alpha of the form #RRGGBBAA.
+
+     - parameter hex8: Eight-digit hexadecimal value.
+
+     - returns: new instance with given eight-digit hexadecimal value
+     */
+    public convenience init(hex8: UInt32) {
+        let red     = CGFloat((hex8 & 0xFF000000) >> 24) / 0xFF
+        let green   = CGFloat((hex8 & 0x00FF0000) >> 16) / 0xFF
+        let blue    = CGFloat((hex8 & 0x0000FF00) >>  8) / 0xFF
+        let alpha   = CGFloat((hex8 & 0x000000FF) >>  0) / 0xFF
+
+        self.init(red: red, green: green, blue: blue, alpha: alpha)
+    }
+
+
     /**
      convenience failable initializer which creates an instance with given hex color values if string has a correct format
 
@@ -38,7 +88,7 @@ public extension UIColor {
         let hexStringWithoutHash = hexString.stringByReplacingOccurrencesOfString("#", withString: "",
                                                                                   options: .LiteralSearch, range: nil)
         if let hex = UInt32(hexStringWithoutHash, radix: 16) {
-            self.init(hex: hex, alpha: alpha)
+            self.init(hex6: hex, alpha: alpha)
         } else {
             return nil
         }