Tint an image with a particular color, using `kCGBlendModeNormal`.

ColorFunctions.m

UIImage *TintImageWithTintColor(UIImage *image, UIColor *tintColor) {
    // Huge props to http://stackoverflow.com/questions/3514066/how-to-tint-a-transparent-png-image-in-iphone
    
    UIGraphicsBeginImageContext(image.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    
    CGContextTranslateCTM(context, 0, image.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);
    
    CGRect rect = (CGRect){ CGPointZero, image.size };
    
    // image drawing code
    // draw black background to preserve color of transparent pixels
    CGContextSetBlendMode(context, kCGBlendModeNormal);
    [[UIColor blackColor] setFill];
    CGContextFillRect(context, rect);
    
    // draw original image
    CGContextSetBlendMode(context, kCGBlendModeNormal);
    CGContextDrawImage(context, rect, image.CGImage);
    
    // tint image (loosing alpha) - the luminosity of the original image is preserved
    CGContextSetBlendMode(context, kCGBlendModeColor);
    [tintColor setFill];
    CGContextFillRect(context, rect);
    
    // mask by alpha values of original image
    CGContextSetBlendMode(context, kCGBlendModeDestinationIn);
    CGContextDrawImage(context, rect, image.CGImage);
    
    UIImage *coloredImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    
    return coloredImage;
}

I get "Use of unresolved identifier 'kCGBlendModeNormal'" error