Color tinting an UIImage - objective-c

Question

I'm really stuck on tinting an UIImage with a certain tint. The UIImage is in a custom TableView cell (if that makes any difference).
Looking at the picture, the UIImage has been replaced by 0.5 opacity yellow and the original image has been discarded. I want a tint on an existing image, not overwrite the image entirely. (p.s: the numbers in the picture are labels that are on top of the image, they are unrelated).
I realize there are similiar threads on stackoverflow and I must have tried out all the code that there is :-) Nothing is working. I don't expect anyone to post any code, just a push in the right direction!
Explanation of the code below:
myImage is the image
color is the color, probably yellow, with an opacity of 0.5
I use [util tintedImageWithColor] with both myImage and color.
It comes out as the picture above.
Does anyone have an idea, a push in the right direction?
Updated
MasterViewController.m
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
ArticleCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell" forIndexPath:indexPath];
Article *article = self.articles[indexPath.row];
Utils *util = [[Utils alloc] init];
// Populate cell components
UIImage *myImage = [UIImage imageWithData:article.post_image_thumbnail_data];
// Set image tint
UIColor *color = [UIColor colorWithRed:(160/15.0) green:(97/15.0) blue:(5/55.0) alpha:0.5];
myImage = [util tintedImageWithColor:(UIImage *) myImage:(UIColor *) color blendingMode:kCGBlendModeDestinationIn highQuality:YES];
cell.imageView.image = myImage;
return cell;
}
Utils.m
- (UIImage *)tintedImageWithColor:(UIImage*)image : (UIColor *)tintColor blendingMode:(CGBlendMode)blendMode highQuality:(BOOL) yerOrNo;
{
CGSize size = CGSizeMake(70, 70);
UIGraphicsBeginImageContextWithOptions(size, NO, 0.0f);
if (yerOrNo) {
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetShouldAntialias(context, true);
CGContextSetAllowsAntialiasing(context, true);
CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
}
[tintColor setFill];
CGRect bounds = CGRectMake(0, 0, size.width, size.height);
UIRectFill(bounds);
[image drawInRect:bounds blendMode:blendMode alpha:1.0f];
if (blendMode != kCGBlendModeDestinationIn)
[image drawInRect:bounds blendMode:kCGBlendModeDestinationIn alpha:0.4];
UIImage *tintedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return tintedImage;
}
Utils.h
- (UIImage *)tintedImageWithColor:(UIImage*)image : (UIColor *)tintColor blendingMode:(CGBlendMode)blendMode highQuality:(BOOL) yerOrNo;

Answer 1

I've found this piece on code in one of my projects, I don't know the exact source, but it should works, use kCGBlendModeDestinationIn:
- (UIImage *)tintedImageWithColor:(UIColor *)tintColor blendingMode:(CGBlendMode)blendMode highQuality:(BOOL) yerOrNo;
{
UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);
if (yerOrNo) {
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSetShouldAntialias(context, true);
CGContextSetAllowsAntialiasing(context, true);
CGContextSetInterpolationQuality(context, kCGInterpolationHigh);
}
[tintColor setFill];
CGRect bounds = CGRectMake(0, 0, self.size.width, self.size.height);
UIRectFill(bounds);
[self drawInRect:bounds blendMode:blendMode alpha:1.0f];
if (blendMode != kCGBlendModeDestinationIn)
[self drawInRect:bounds blendMode:kCGBlendModeDestinationIn alpha:1.0];
UIImage *tintedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return tintedImage;
}