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  • Convert Hexacode to UIColor in objective c

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    To convert the hexacode to color we can create a category of UIColor and implement the following code -

    it will return the code corresponding to that hexacode

    Hexa code can be in following format

    1- #RGB
    2 -#ARGB
    3- #RRGGBB
    4- #AARRGGBB

    How to Create the category of an exiting class

    1- Open your Xcode

    2- Go to File menu -> file -> Add new file

    3- Select objective-C file

    4- You will se three option (File, File type, Class)

    5- File - Enter your file name

    6- File type (select category)

    7- Class (UIColor)

     

    + (UIColor *) colorWithHexString: (NSString *) hexString {   
        NSString *colorString = [[hexString stringByReplacingOccurrencesOfString: @"#" withString: @""] uppercaseString];
        CGFloat alpha, red, blue, green;
        switch ([colorString length]) {
            case 3:  //#RGB
                alpha = 1.0f;
                red   = [self colorComponentFrom: colorString start: 0 length: 1];
                green = [self colorComponentFrom: colorString start: 1 length: 1];
                blue  = [self colorComponentFrom: colorString start: 2 length: 1];
                break;
            case 4:  //#ARGB
                alpha = [self colorComponentFrom: colorString start: 0 length: 1];
                red   = [self colorComponentFrom: colorString start: 1 length: 1];
                green = [self colorComponentFrom: colorString start: 2 length: 1];
                blue  = [self colorComponentFrom: colorString start: 3 length: 1];
                break;
            case 6:  //#RRGGBB
                alpha = 1.0f;
                red   = [self colorComponentFrom: colorString start: 0 length: 2];
                green = [self colorComponentFrom: colorString start: 2 length: 2];
                blue  = [self colorComponentFrom: colorString start: 4 length: 2];
                break;
            case 8:  //#AARRGGBB
                alpha = [self colorComponentFrom: colorString start: 0 length: 2];
                red   = [self colorComponentFrom: colorString start: 2 length: 2];
                green = [self colorComponentFrom: colorString start: 4 length: 2];
                blue  = [self colorComponentFrom: colorString start: 6 length: 2];
                break;
            default:
                [NSException raise:@"Invalid color value" format: @"Color value %@ is invalid.  It should be a hex value of the form #RBG, #ARGB, #RRGGBB, or #AARRGGBB", hexString];
                break;
        }
        return [UIColor colorWithRed: red green: green blue: blue alpha: alpha];
    }
    + (CGFloat) colorComponentFrom: (NSString *) string start: (NSUInteger) start length: (NSUInteger) length {
        NSString *substring = [string substringWithRange: NSMakeRange(start, length)];
        NSString *fullHex = length == 2 ? substring : [NSString stringWithFormat: @"%@%@", substring, substring];
        unsigned hexComponent;
        [[NSScanner scannerWithString: fullHex] scanHexInt: &hexComponent];
        return hexComponent / 255.0;
    }

     

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