Splitting an UIImage in two different UIimageviews in CoreGraphics-iPhone - iphone

Question

Problem: I have an three UIImageViews. One has an UIImage and the other two are namely - leftImageView & rightImageView. The leftImageView has the left half of the image and the right one has the other. I am trying to achieve this using Coregraphics, i.e. drawing an image in the two imageviews.
But the right imageview isn't showing up. Refer to the code below:
UIImage *image = imgView.image;
CGSize sz = [image size];
CGRect leftRect = CGRectMake(0, 0, imgView.frame.size.width/2, imgView.frame.size.height);
CGRect rightRect = CGRectMake(imgView.frame.size.width/2, 0, imgView.frame.size.width/2, imgView.frame.size.height);
CGImageRef leftReference = CGImageCreateWithImageInRect([image CGImage], leftRect);
CGImageRef rightReference = CGImageCreateWithImageInRect([image CGImage], rightRect);
// Left Image ...
UIGraphicsBeginImageContextWithOptions(CGSizeMake(leftRect.size.width, leftRect.size.height), NO, 0);
CGContextRef con = UIGraphicsGetCurrentContext();
CGContextDrawImage(con, leftRect,flip(leftReference));
imgViewLeft = [[UIImageView alloc] initWithImage:UIGraphicsGetImageFromCurrentImageContext()];
UIGraphicsEndImageContext();
[self.view addSubview:imgViewLeft];
// Right Image ...
UIGraphicsBeginImageContextWithOptions(CGSizeMake(rightRect.size.width, rightRect.size.height), NO, 0);
con = UIGraphicsGetCurrentContext();
CGContextDrawImage(con, rightRect,flip(rightReference));
imgViewRight = [[UIImageView alloc] initWithImage:UIGraphicsGetImageFromCurrentImageContext()];
UIGraphicsEndImageContext();
[self.view addSubview:imgViewRight];

Answer 1

I think that you can use the following code part.
UIImage *image = [UIImage imageNamed:#"xxx.png"]; // You can change this line.
BOOL isLeft = YES; // You can change this variable(isLeft = YES : left piece, NO : right piece).
UIGraphicsBeginImageContext(CGSizeMake(image.size.width / 2, image.size.height));
CGContextRef context = UIGraphicsGetCurrentContext();
if (isLeft)
CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(0, 0, image.size.width, image.size.height), image.CGImage);
else
CGContextDrawImage(UIGraphicsGetCurrentContext(), CGRectMake(- image.size.width / 2, 0, image.size.width, image.size.height), image.CGImage);
UIImage *imageCopy = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return imageCopy;
I couldn't launch this code now, but I think that my code is almost correct. Please try this.
Edit :
In your code :
// Right Image ...
UIGraphicsBeginImageContextWithOptions(CGSizeMake(rightRect.size.width, rightRect.size.height), NO, 0);
con = UIGraphicsGetCurrentContext();
CGContextDrawImage(con, rightRect,flip(rightReference));
imgViewRight = [[UIImageView alloc] initWithImage:UIGraphicsGetImageFromCurrentImageContext()];
UIGraphicsEndImageContext();
There is a wrong part in the third line :
CGContextDrawImage(con, rightRect,flip(rightReference));
It should be
CGContextDrawImage(con, leftRect,flip(rightReference));