代碼直接復(fù)制就行 swif2.3可以的~~~

extension UIColor{
    
    class func colorWithString(aString:String)->UIColor{
        var aString = aString
        aString.replaceRange(aString.rangeOfString("#")!, with: "0x");
        
        let colorLong = strtoul(aString.cStringUsingEncoding(NSUTF8StringEncoding)!,
            nil, 16);
        let R = Double((colorLong & 0xFF0000)>>16);
        let G = Double((colorLong & 0x00FF00)>>8);
        let B = Double(colorLong & 0x0000FF);
        
        return UIColor.init(red: CGFloat(R)/255.0, green: CGFloat(G)/255.0, blue: CGFloat(B)/255.0, alpha: 1.0);
    }
    
}

使用方法 ：

let color = UIColor.colorWithString("#6D6E71")