How can I merge 2 image in 2 UIImageView into 1 image - ios

Question

I want to merge 2 image in 2 UIImageView into 1 image with "correct" position, angle, ratio scale as I see on screen.
In my project, there are 2 UIImageView
- imageView is the main UIImageView
- topImageView is the overlay UIImageView that can be drag, rotate, scale
I can save image merged by draw 2 images but wrong position, angle, ratio scale.
This is my code:
UIImage *img = topImageView.image;
UIImage *bottomImg = self.imageView.image;
CGSize bounds = self.imageView.image.size;
UIGraphicsBeginImageContext(bounds);
CGContextRef ctx = UIGraphicsGetCurrentContext();
CGContextTranslateCTM(ctx, topImageView.image.size.width * 0.5, topImageView.image.size.height * 0.5);
CGFloat angle = atan2(topImageView.transform.b, topImageView.transform.a);
CGContextRotateCTM(ctx, angle);
[topImageView.image drawInRect:CGRectMake(-topImageView.image.size.width * 0.5,
-topImageView.image.size.height * 0.5,
topImageView.image.size.width,
topImageView.image.size.height)];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
UIGraphicsBeginImageContext(bounds);
[bottomImg drawInRect:CGRectMake(0, 0, bounds.width, bounds.height)];
[newImage drawInRect:CGRectMake(topImageView.frame.origin.x,
topImageView.frame.origin.y,
newImage.size.width,
newImage.size.height)];
UIImage *finalImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
Any idea to help me? Thanks a lot!

Answer 1

Add both of those images as subviews to a UIView. Do what you need to the images and then take a snapshot of the UIVIew like so:
UIGraphicsBeginImageContext(view.bounds.size);
[view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *MergedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Answer 2

Try This
#pragma mark - Marge two Images
- (UIImage *) addImageToImage:(UIImage *)img withImage2:(UIImage *)img2{
CGSize size = CGSizeMake(imageView.image.size.width, imageView.image.size.height);
UIGraphicsBeginImageContext(size);
CGPoint pointImg1 = CGPointMake(0,0);
[img drawAtPoint:pointImg1];
CGPoint pointImg2 = CGPointMake(0,0);
[img2 drawAtPoint: pointImg2];
UIImage* result = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return result;
}
[self addImageToImage:imageView.image withImage2:imageView2.image];