Method that Creates a Thumbnail from a UIImage

GeneratePhotoThumbnail.m

+ (UIImage *)generatePhotoThumbnail:(UIImage *)image {
	// Create a thumbnail version of the image for the event object.
	CGSize size = image.size;
	CGSize croppedSize;
	CGFloat ratio = 64.0;
	CGFloat offsetX = 0.0;
	CGFloat offsetY = 0.0;
	
	// check the size of the image, we want to make it 
	// a square with sides the size of the smallest dimension
	if (size.width > size.height) {
		offsetX = (size.height - size.width) / 2;
		croppedSize = CGSizeMake(size.height, size.height);
	} else {
		offsetY = (size.width - size.height) / 2;
		croppedSize = CGSizeMake(size.width, size.width);
	}
	
	// Crop the image before resize
	CGRect clippedRect = CGRectMake(offsetX * -1, offsetY * -1, croppedSize.width, croppedSize.height);
	CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], clippedRect);
	// Done cropping
	
	// Resize the image
	CGRect rect = CGRectMake(0.0, 0.0, ratio, ratio);
	
	UIGraphicsBeginImageContext(rect.size);
	[[UIImage imageWithCGImage:imageRef] drawInRect:rect];
	UIImage *thumbnail = UIGraphicsGetImageFromCurrentImageContext();
	UIGraphicsEndImageContext();
	// Done Resizing
	
	return thumbnail;
}

This is great, but you also need to release imageRef, or you have a memory leak:

    CGImageRelease(imageRef);

great really Helpful . !!! But it seems you are not takin in account the orientation of the image .I know in swift you get the right orientation by passing the original image orientation when initializing the UIImage "imageWithCGImage" line 8 .
thanks a Lot !!!!