objective c - How can I get a hex string from UIColor or from rgb

Question

Now I can convert a hex string to rgb color like this:

// Input is without the # ie : white = FFFFFF
+ (UIColor *)colorWithHexString:(NSString *)hexString
{
    unsigned int hex;
    [[NSScanner scannerWithString:hexString] scanHexInt:&hex];
    int r = (hex >> 16) & 0xFF;
    int g = (hex >> 8) & 0xFF;
    int b = (hex) & 0xFF;

    return [UIColor colorWithRed:r / 255.0f
                        green:g / 255.0f
                        blue:b / 255.0f
                        alpha:1.0f];
}

bu how can I convert rgb to hex string?

Answer 1

Use this method :

- (NSString *)hexStringForColor:(UIColor *)color {
      const CGFloat *components = CGColorGetComponents(color.CGColor);
      CGFloat r = components[0];
      CGFloat g = components[1];
      CGFloat b = components[2];
      NSString *hexString=[NSString stringWithFormat:@"%02X%02X%02X", (int)(r * 255), (int)(g * 255), (int)(b * 255)];
      return hexString;
}