Add color to the text field, labels, background, button text etc using the hexa color code as like in html.

Place the following function in the current viewController.m file

    NSString *cString = [[hex stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]] uppercaseString];
    // String should be 6 or 8 characters
    if ([cString length] < 6) return [UIColor grayColor];
    // strip 0X if it appears
    if ([cString hasPrefix:@"0X"]) cString = [cString substringFromIndex:2];
    if ([cString length] != 6) return  [UIColor grayColor];
    // Separate into r, g, b substrings
    NSRange range;
    range.location = 0;
    range.length = 2;
    NSString *rString = [cString substringWithRange:range];
    range.location = 2;
    NSString *gString = [cString substringWithRange:range];
    range.location = 4;
    NSString *bString = [cString substringWithRange:range];
    // Scan values
    unsigned int r, g, b;
    [[NSScanner scannerWithString:rString] scanHexInt:&r];
    [[NSScanner scannerWithString:gString] scanHexInt:&g];
    [[NSScanner scannerWithString:bString] scanHexInt:&b];
    return [UIColor colorWithRed:((float) r / 255.0f)
                           green:((float) g / 255.0f)
                            blue:((float) b / 255.0f)

Now call the function from the .m file to assign a color with the color code

[self colorWithHexString:@"FFFFFF"]

Now it will create a white color with the given hexa code.

To set the background color of the current view, Add the below code in the viewDidLoad function the .m file

self.view.backgroundColor=[self colorWithHexString:@"000000"];

Now the background will be black in color.

Similarly change background color of button. see below

[your_button setBackgroundColor:[self colorWithHexString:@"FFFFFF"]];

Now the button background will be white in color.

Similarly change text color of button. see below

[your_button setTitleColor:[self colorWithHexString:@"FFFFFF"] forState:UIControlStateNormal];

Now button text is white in color.

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