How to crop or get a smaller size UIImage in iPhone without memory leaks?
<p>I am using a navigation controller in which I push a tableview Controller as follows:</p>

<p>TableView *Controller = [[TableView alloc] initWithStyle:UITableViewStylePlain];
[self.navigationController pushViewController:Controller animated:NO];
[Controller release];</p>

<p>In this table view I am using following two methods to display images:</p>

<pre><code>- (UIImage*) getSmallImage:(UIImage*) img
{
    CGSize size = img.size;
    CGFloat ratio = 0;
    if (size.width &lt; size.height) {
     ratio = 36 / size.width;
    } else {
     ratio = 36 / size.height;
    }
    CGRect rect = CGRectMake(0.0, 0.0, ratio * size.width, ratio * size.height);

    UIGraphicsBeginImageContext(rect.size);
    [img drawInRect:rect];

    return UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
}

- (UIImage*)imageByCropping:(UIImage *)imageToCrop toRect:(CGRect)rect
{

    //create a context to do our clipping in
    UIGraphicsBeginImageContext(rect.size);
    CGContextRef currentContext = UIGraphicsGetCurrentContext();

    //create a rect with the size we want to crop the image to
    //the X and Y here are zero so we start at the beginning of our
    //newly created context

    CGFloat X = (imageToCrop.size.width - rect.size.width)/2;
    CGFloat Y = (imageToCrop.size.height - rect.size.height)/2;


    CGRect clippedRect = CGRectMake(X, Y, rect.size.width, rect.size.height);
    //CGContextClipToRect( currentContext, clippedRect);



    //create a rect equivalent to the full size of the image
    //offset the rect by the X and Y we want to start the crop
    //from in order to cut off anything before them
    CGRect drawRect = CGRectMake(0,
            0,
            imageToCrop.size.width,
            imageToCrop.size.height);

    CGContextTranslateCTM(currentContext, 0.0, drawRect.size.height);
    CGContextScaleCTM(currentContext, 1.0, -1.0);
    //draw the image to our clipped context using our offset rect
    //CGContextDrawImage(currentContext, drawRect, imageToCrop.CGImage);


    CGImageRef tmp = CGImageCreateWithImageInRect(imageToCrop.CGImage, clippedRect);

    //pull the image from our cropped context
    UIImage *cropped = [UIImage imageWithCGImage:tmp];//UIGraphicsGetImageFromCurrentImageContext();
    CGImageRelease(tmp);
    //pop the context to get back to the default
    UIGraphicsEndImageContext();

    //Note: this is autoreleased*/
    return cropped;
}
</code></pre>

<p>But when I pop the Controller, the memory being used is not released.
Is there any leaks in the above code used to create and crop images. </p>

<p>Also are there any efficient method to deal with images in iPhone. I am having a lot of images and facing major challeges in resolving the memory issues.</p>

<p>tnx in advance.</p>
