Merge a UIImageView with a UIView that contains different subviews - ios

Question

I have a UIImage (called image) that i want to merge with another UIView (called overlayView), that contains different subviews eg. UILabels, UIImageViews and so on, to make a new UIImage (called mergedImage). Here's my code until now:
-(UIImage *) mergeViewWithImage: (UIImage *) image{
//The mergedImage need to be the same size as the image
UIGraphicsBeginImageContext(image.size);
//I'm doing this to get the layer, when i renderInContext, other ways?
UIImageView *temp = [[UIImageView alloc] initWithImage:image];
//This is working, the view gets its new frame, but the subviews won't scale up
[overlayView setFrame:CGRectMake(0, 0, image.size.width, image.size.height)];
[temp.layer renderInContext:UIGraphicsGetCurrentContext()];
[overlayView.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *mergedImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
//Need to set the frame to the initial one
[overlayView setFrame:CGRectMake(0, 0, 320, 320)];
return mergedImage;
}
This screenshot is what I really want it to look like
what you see is a AVCaptureVideoPreviewLayer (320*320), in the square, and I have a UIView, called overlayView (320*320), on top. When i press the "Take"-button, I do certain scaling, cropping and so on with the AVCaptureStillImageOutput, then i run the mergeViewWithImage-method. At this point the image is 968*968, but the overlayView is still 320*320 (has a blue boarder, just to know where it is). When I setFrame: to the overlayView, the the subviews, eg. the example-image of Luca Toni in the left lower corner doesn't scale, as you see in this screenshot
This is what i get
So you see, the background image (a white wall) stays the same, and the overlayView did resize, but the image of Luca Toni is much smaller, it wont scale... Please, help.
I've tried a lot of things, like setting this:
//imageOne is the picture with Luca Toni...
[[overlayView imageOne] setAutoresizingMask: UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth];
The overlayView is made in the Interface Builder as a .xib, which is a UIView with a UIImageVIew (imageOne), and has its own UIVIew custom class (nothing here yet, only the reference to imageOne (Luca Toni)). The overlayView is initiated in the MainViewController, like this:
[self overlayView:[[OverlayView alloc] init]];
overlayView = [[[NSBundle mainBundle] loadNibNamed:#"OverlayView" owner:self options:nil] objectAtIndex:0];
and added to the main view like this:
[[self view] addSubview:overlayView];