Question

I am building an app for iOS 5 using ARC and I seem to be having some memory issues. Basically its taking screen-shots of a portion of the display, placing the UIImage in an MSMutableArray and then piecing the screen-shots together for one big image. Now the problem is that after doing this a couple of times the OS closes the application due to high memory usage.

Here is the snippet that pieces the UIImage’s together:

UIImage* finalImage = nil;
//join the screenshot images together
UIGraphicsBeginImageContext(CGSizeMake(collage.width, collage.height));
{
    int hc = 0;
    for(UIImage *img in imageArr)
    {
        NSLog(@"drawing image at:: %i", hc);
        [img drawAtPoint:CGPointMake(0, hc)];
        hc+=img.size.height;
        img = nil;
    }

    //NSLog(@"creating finalImage");
    finalImage = UIGraphicsGetImageFromCurrentImageContext();
}
UIGraphicsEndImageContext();
//do something with the combined image
//remove all the objects
[imageArr removeAllObjects];
//reset class instance
[self setImageArr: [[NSMutableArray alloc] init]];

Are they any other alternatives that I could use so there isn’t so much memory being used? Maybe storing a CGImageRef in the array? Are there any potential memory leaks with the above code?

Any tips, pointers would be greatly appreciated.

Thanks.

Answer 1

Turns out the imageArr is being cleared properly. There appears to be a memory issue somewhere else in the program.