Retina-aware category for tinting, darkening and lightening a UIImage.
#import "UIImage+RTTint.h"
...
UIImage *image = [UIImage imageNamed:@"Logo.png"];
UIImage *tinted = [image rt_tintedImageWithColor:[UIColor redColor] level:0.5f];
See UIImage+RTTint.h for more.
Copyright © 2013 Ramon Torres. Released under the MIT License.