Swift UIColor 16進制編碼轉換RGB格式

Swift UIColor 16進制編碼轉換RGB ：

由於UI出圖的時候，通常給的是16進制的編碼顏色，我們在開發的時候需要將它轉換為RGB格式，現在給出兩種代碼片段，喜歡哪種就用哪種...

 

一、對UIColor進行擴展

extension UIColor {

    /**
     Make color with hex string
     - parameter hex: 16進制字符串
     - returns: RGB
     */
    static func colorWithHexString (hex: String) -> UIColor {

        var cString: String = hex.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).uppercaseString

        if (cString.hasPrefix("#")) {
            cString = (cString as NSString).substringFromIndex(1)
        }

        if (cString.characters.count != 6) {
            return UIColor.grayColor()
        }

        let rString = (cString as NSString).substringToIndex(2)
        let gString = ((cString as NSString).substringFromIndex(2) as NSString).substringToIndex(2)
        let bString = ((cString as NSString).substringFromIndex(4) as NSString).substringToIndex(2)

        var r:CUnsignedInt = 0, g:CUnsignedInt = 0, b:CUnsignedInt = 0;
        NSScanner(string: rString).scanHexInt(&r)
        NSScanner(string: gString).scanHexInt(&g)
        NSScanner(string: bString).scanHexInt(&b)

        return UIColor(red: CGFloat(r) / 255.0, green: CGFloat(g) / 255.0, blue: CGFloat(b) / 255.0, alpha: CGFloat(1))
    }
}

 

 

二、簡便方法，直接調用代碼片段

個人推薦使用這個方法，創建一個宏定義文件

func kRGBColorFromHex(rgbValue: Int) -> (UIColor) {

        return UIColor(red: ((CGFloat)((rgbValue & 0xFF0000) >> 16)) / 255.0,
                 green: ((CGFloat)((rgbValue & 0xFF00) >> 8)) / 255.0,
                  blue: ((CGFloat)(rgbValue & 0xFF)) / 255.0,
                 alpha: 1.0)
}

可以這樣調用
kRGBColorFromHex(0x1D1D26)