Zooming an UIImageView that contains subviews - ios

Question

I have an UIImageView object in UIScrollView(to zoom). In addition, UIImageView also contains subviews. I am using following function to zoom in UIImageView.
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
return self.imageView
}
It works perfectly fine for UIImageView.
The problem is when zooming these subviews, it also zooms these subviews the same way. Is there a way to disable zooming for these subviews?

Answer 1

There are many ways to achieve this. I would say the easiest one is to simply back-scale your views. This is what I used as a demo:
class ViewController: UIViewController {
#IBOutlet private var scrollView: UIScrollView?
private var imageView: UIImageView?
private var annotations: [UIView] = [UIView]()
override func viewDidLoad() {
super.viewDidLoad()
let imageView = UIImageView(image: UIImage(named: "background"))
scrollView?.addSubview(imageView)
scrollView?.contentSize = imageView.bounds.size
scrollView?.maximumZoomScale = 5.0
self.imageView = imageView
scrollView?.delegate = self
applyAnnotationView({
let view = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 10.0, height: 10.0))
view.backgroundColor = UIColor.red
view.layer.cornerRadius = view.bounds.width*0.5
return view
}(), at: CGPoint(x: 100.0, y: 100.0))
applyAnnotationView({
let view = UIView(frame: CGRect(x: 0.0, y: 0.0, width: 10.0, height: 10.0))
view.backgroundColor = UIColor.green
view.layer.cornerRadius = view.bounds.width*0.5
return view
}(), at: CGPoint(x: 200.0, y: 200.0))
}
func applyAnnotationView(_ view: UIView, at position: CGPoint) {
view.center = position
annotations.append(view)
imageView?.addSubview(view)
}
}
// MARK: - UIScrollViewDelegate
extension ViewController: UIScrollViewDelegate {
func scrollViewDidZoom(_ scrollView: UIScrollView) {
annotations.forEach { item in
item.transform = CGAffineTransform(scaleX: 1.0/scrollView.zoomScale, y: 1.0/scrollView.zoomScale)
}
}
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
return imageView
}
}
Simply applying CGAffineTransform(scaleX: 1.0/scrollView.zoomScale, y: 1.0/scrollView.zoomScale) does all the work. It should be OK even when using constraints.

Answer 2

The UIView, which is inside the UIImageView, will always be the same size, but will be anchored to a specific point in the image (10% at the top and 10% at the left):
var item: UIView?
override func viewDidLoad() {
...
item = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
setPosition()
item?.backgroundColor = UIColor.red
imageView.addSubview(item!)
...
}
func setPosition() {
let x = imageView.frame.size.width/10
let y = imageView.frame.size.height/10
item?.frame = CGRect(x: x, y: y, width: 200, height: 200)
}
func scrollViewDidZoom(_ scrollView: UIScrollView) {
...
setPosition()
...
}
Instead of 10%, you can use the exact figure, using the formula:
x = startPosition/startWidthImage*currentWidthImage