How to tint the background images of an UIButton programmatically and dynamically?

In iOS7 you can use the method imagedWithRenderingMode: in conjunction with the method setTintColor:

But, be sure to use UIImageRenderingModeAlwaysTemplate as it replaces all non-transparent colors on a UIImage with the tint color. The default is UIImageRenderingModeAutomatic.

UIImageRenderingModeAlwaysTemplate

Always draw the image as a template image, ignoring its color information.

Objective-C:

UIImage * image = [myButton.currentImage imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
[myButton setImage:image forState:UIControlStateNormal];

Swift:

let image = myButton.currentImage?.withRenderingMode(.alwaysTemplate)
myButton.setImage(image, for: .normal)

I made a UIImage category following another post that i cant find that takes the image and tints it as follows:

- (UIImage *)tintedImageWithColor:(UIColor *)tintColor {
    UIGraphicsBeginImageContextWithOptions(self.size, NO, [[UIScreen mainScreen] scale]);
    CGContextRef context = UIGraphicsGetCurrentContext();


    CGContextTranslateCTM(context, 0, self.size.height);
    CGContextScaleCTM(context, 1.0, -1.0);

    CGRect rect = CGRectMake(0, 0, self.size.width, self.size.height);

    // draw alpha-mask
    CGContextSetBlendMode(context, kCGBlendModeNormal);
    CGContextDrawImage(context, rect, self.CGImage);

    // draw tint color, preserving alpha values of original image
    CGContextSetBlendMode(context, kCGBlendModeSourceIn);
    [tintColor setFill];
    CGContextFillRect(context, rect);

    UIImage *coloredImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return coloredImage;
}

This will take the image and fill in all of the areas with an alpha value with the given color.

I created a UIButton category using horsejockey's code: https://github.com/filipstefansson/UITintedButton

Here's the new methods:

-(void)setImageTintColor:(UIColor *)color;
-(void)setBackgroundTintColor:(UIColor *)color forState:(UIControlState)state;
+(void)tintButtonImages:(NSArray *)buttons withColor:(UIColor *)color;
+(void)tintButtonBackgrounds:(NSArray *)buttons withColor:(UIColor *)color forState:(UIControlState)state;