UIImage+Color.m

//
//  UIImage+Color.m
//
//  Created by Sam McEwan sammcewan@me.com on 15/10/12.
//
//

#import "UIImage+Color.h"

@implementation UIImage (Color)

- (UIImage*)changeColor:(UIColor*)color
{
    UIGraphicsBeginImageContextWithOptions(self.size, YES, [[UIScreen mainScreen] scale]);
    
    CGRect contextRect;
    contextRect.origin.x = 0.0f;
    contextRect.origin.y = 0.0f;
    contextRect.size = [self size];
    
    // Retrieve source image and begin image context
    CGSize itemImageSize = [self size];
    CGPoint itemImagePosition;
    itemImagePosition.x = ceilf((contextRect.size.width - itemImageSize.width) / 2);
    itemImagePosition.y = ceilf((contextRect.size.height - itemImageSize.height) );
    
    UIGraphicsBeginImageContextWithOptions(contextRect.size, NO, [[UIScreen mainScreen] scale]);
    
    CGContextRef c = UIGraphicsGetCurrentContext();
    
    // Setup shadow
    // Setup transparency layer and clip to mask
    CGContextBeginTransparencyLayer(c, NULL);
    CGContextScaleCTM(c, 1.0, -1.0);
    CGContextClipToMask(c, CGRectMake(itemImagePosition.x, -itemImagePosition.y, itemImageSize.width, -itemImageSize.height), [self CGImage]);
    // Fill and end the transparency layer
    CGColorSpaceRef colorSpace = CGColorGetColorSpace(color.CGColor);
    CGColorSpaceModel model = CGColorSpaceGetModel(colorSpace);
    const CGFloat* colors = CGColorGetComponents(color.CGColor);
    
    if(model == kCGColorSpaceModelMonochrome)
    {
        CGContextSetRGBFillColor(c, colors[0], colors[0], colors[0], colors[1]);
    }else{
        CGContextSetRGBFillColor(c, colors[0], colors[1], colors[2], colors[3]);
    }
    contextRect.size.height = -contextRect.size.height;
    contextRect.size.height -= 15;
    CGContextFillRect(c, contextRect);
    CGContextEndTransparencyLayer(c);
    
    UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return img;
}

@end