Change UIImage's color

ChangeColor.m

// Heavily based on http://compileyouidontevenknowyou.blogspot.com.br/2010/12/change-colors-of-uiimage-using-uicolor.html by Dan Rosenstark
// Fix for monochrome model on the comment on the same post by Ben Cunningham
// Removal of unneeded code by Daniel Ferreira (theiostream).

static UIImage *UIImageChangeColor(UIImage *image, UIColor *color_) {
	CGColorRef color = [color_ CGColor];
		
	CGRect contextRect = (CGRect){CGPointZero, [image size]};
 	UIGraphicsBeginImageContext(contextRect.size);
 	CGContextRef ctx = UIGraphicsGetCurrentContext();
	
	CGContextBeginTransparencyLayer(ctx, NULL);
	CGContextScaleCTM(ctx, 1.f, -1.f);
	CGContextClipToMask(ctx, CGRectMake(contextRect.origin.x, -contextRect.origin.y, contextRect.size.width, -contextRect.size.height), [image CGImage]);
	
	CGColorSpaceRef colorSpace = CGColorGetColorSpace(color);
	CGColorSpaceModel model = CGColorSpaceGetModel(colorSpace);
	const CGFloat *colors = CGColorGetComponents(color);
	if (model == kCGColorSpaceModelMonochrome)
		CGContextSetRGBFillColor(ctx, colors[0], colors[0], colors[0], colors[1]);
	else
		CGContextSetRGBFillColor(ctx, colors[0], colors[1], colors[2], colors[3]);
	
	contextRect.size.height = -contextRect.size.height;
	CGContextFillRect(ctx, contextRect);
	
	CGContextEndTransparencyLayer(ctx);
	UIImage *img = UIGraphicsGetImageFromCurrentImageContext();
	UIGraphicsEndImageContext();
	
	return img;
}

Looks great. I'll have to test it at some point, but it does look correct. Thanks!

You should use UIGraphicsBeginImageContextWithOptions, or it'll look blurry on retina devices.