Call method from these classes?

[Objective Zero]

Hey,

I am looking at this tutorial: Resize a UIImage the right way — Trevor’s Bike Shed

The thing is, if I download the files, it comes up with 6 files. These files are 'add-ons' to UIImage.
But does anyone know how I can actually call one of these methods from my UIViewController?

I really need help with this!

Thanks!

[Domele]

It looks like they are categories. Categories allow you to extend the functionality of a class by adding methods. So you'd call the methods outlined in the header files as if they were native UIImage methods.

[Objective Zero]

This isn't from the link you showed me but this code does what this thread related to, I get a leak in this line:

newImage = [[UIImage imageWithCGImage:imageMasked] retain];

Although in the following line they do:

CGImageRelease(imageMasked);

Any idea how to fix this leak?

[apatsufas]

Originally Posted by Objective Zero

This isn't from the link you showed me but this code does what this thread related to, I get a leak in this line:

newImage = [[UIImage imageWithCGImage:imageMasked] retain];

Although in the following line they do:

CGImageRelease(imageMasked);

Any idea how to fix this leak?

I'm guessing newImage is leaking rather than imageMasked. You are retaining newImage are you releasing it?

[Objective Zero]

This is the whole method:

-(UIImage *)makeRoundCornerImage : (UIImage*) img : (int) cornerWidth : (int) cornerHeight
{
	UIImage * newImage = nil;
    
	if( nil != img)
	{
		NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
		int w = img.size.width;
		int h = img.size.height;
        
		CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
		CGContextRef context = CGBitmapContextCreate(NULL, w, h, 8, 4 * w, colorSpace, kCGImageAlphaPremultipliedFirst);
        
		CGContextBeginPath(context);
		CGRect rect = CGRectMake(0, 0, img.size.width, img.size.height);
		addRoundedRectToPath(context, rect, cornerWidth, cornerHeight);
		CGContextClosePath(context);
		CGContextClip(context);
        
		CGContextDrawImage(context, CGRectMake(0, 0, w, h), img.CGImage);
        
		CGImageRef imageMasked = CGBitmapContextCreateImage(context);
		CGContextRelease(context);
		CGColorSpaceRelease(colorSpace);
		[img release];
        
		newImage = [[UIImage imageWithCGImage:imageMasked] retain];
		CGImageRelease(imageMasked);
        
		[pool release];
	}
    
    return newImage;
}

I am just not sure how to properly release it. Do I autorelease it or do I release it before I do pool release?

[apatsufas]

You don't need to retain it. imageWithCGImage: returns an autorelease object so there is no need to retain it. As soon as the autorelease pool is drained it will be released.

[Objective Zero]

I actually changed the whole method I used to this (it achieves the same thing):

- (UIImage*)roundCorneredImage: (UIImage*)orig radius:(CGFloat) r {
    UIGraphicsBeginImageContextWithOptions(orig.size, NO, 0);
    [[UIBezierPath bezierPathWithRoundedRect:(CGRect){CGPointZero, orig.size} 
                                cornerRadius:r] addClip];
    [orig drawInRect:(CGRect){CGPointZero, orig.size}];
    UIImage* result = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();
    return result;
}

And this one has no leaks or warnings!