将16进制的颜色值变成UIColor

+ ( UIColor *) colorFromHexRGB :( NSString *) inColorString
{
 UIColor *result = nil ;
 unsigned int colorCode = 0 ;
 unsigned char redByte, greenByte, blueByte;

 if (nil != inColorString)
 {
  NSScanner *scanner = [ NSScanner scannerWithString :inColorString];
  ( void ) [scanner scanHexInt :&colorCode;]; // ignore error
 }
 redByte = (unsigned char ) (colorCode >> 1 6 );
 greenByte = (unsigned char ) (colorCode >> 8 );
 blueByte = (unsigned char ) (colorCode); // masks off high bits
 result = [UIColor
           colorWithRed : ( float )redByte / 0 xff
           green : ( float )greenByte/ 0 xff
           blue : ( float )blueByte / 0 xff
           alpha : 1 .0 ];
 return result;
}