Re-color a UIImage source: http://stackoverflow.com/questions/12396236/ios-change-the-colors-of-a-uiimage

UIImage+AddtionalFunctionalities.h

#import <UIKit/UIKit.h>

@interface UIImage (AddtionalFunctionalities)

//TintColor...
- (UIImage *)imageWithTint:(UIColor *)tintColor;
//scale and resize...
-(UIImage*)scaleToSize:(CGSize)size;

@end

UIImage+AddtionalFunctionalities.m

#import "UIImage+AddtionalFunctionalities.h"

@implementation UIImage (AddtionalFunctionalities)


- (UIImage *)imageWithTint:(UIColor *)tintColor 
{
    // Begin drawing
    CGRect aRect = CGRectMake(0.f, 0.f, self.size.width, self.size.height);
    CGImageRef alphaMask;

    //
    // Compute mask flipping image
    //
    {
        UIGraphicsBeginImageContext(aRect.size);        
        CGContextRef c = UIGraphicsGetCurrentContext(); 

        // draw image
        CGContextTranslateCTM(c, 0, aRect.size.height);
        CGContextScaleCTM(c, 1.0, -1.0);
        [self drawInRect: aRect];

        alphaMask = CGBitmapContextCreateImage(c);

        UIGraphicsEndImageContext();
    }

    //
    UIGraphicsBeginImageContext(aRect.size);

    // Get the graphic context
    CGContextRef c = UIGraphicsGetCurrentContext(); 

    // Draw the image
    [self drawInRect:aRect];

    // Mask
    CGContextClipToMask(c, aRect, alphaMask);

    // Set the fill color space
    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextSetFillColorSpace(c, colorSpace);

    // Set the fill color
    CGContextSetFillColorWithColor(c, tintColor.CGColor);

    UIRectFillUsingBlendMode(aRect, kCGBlendModeNormal);

    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();    

    // Release memory
    CGColorSpaceRelease(colorSpace);
    CGImageRelease(alphaMask);

    return img;
}


-(UIImage*)scaleToSize:(CGSize)size
{
    // Create a bitmap graphics context
    // This will also set it as the current context
    UIGraphicsBeginImageContext(size);

    // Draw the scaled image in the current context
    [self drawInRect:CGRectMake(0, 0, size.width, size.height)];

    // Create a new image from current context
    UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();

    // Pop the current context from the stack
    UIGraphicsEndImageContext();

    // Return our new scaled image
    return scaledImage;
}

@end