Zoom and paging in one ScrollView - ios

Question

i am trying to create something like Photos gallery.
But now i have problem, with zooming in UIScrollView.
for i in 0..<imageArray.count{
let imageView = UIImageView()
imageView.isUserInteractionEnabled = true
imageView.image = imageArray[i]
imageView.contentMode = .scaleAspectFit
let xPosition = self.view.frame.width * CGFloat(i)
imageView.frame = CGRect(x: 0, y: 0, width: self.scrollView.frame.width, height: self.scrollView.frame.height)
scrollView.addSubview(imageView)
scrollView.contentSize.width = scrollView.frame.width * CGFloat(i+1)
}
scrollView.isScrollEnabled = true
scrollView.minimumZoomScale = 1.0
scrollView.maximumZoomScale = 6.0
scrollView.isUserInteractionEnabled = true
scrollView.delegate = self
Paging works fine, but i dont know now how to enable zooming each imageView.

Answer 1

You will need to implement the following method from the UIScrollViewDelegate protocol:
func viewForZooming(in: UIScrollView) -> UIView?
In that you return the view that you want to be zooming.
Now in this case you have multiple image views (depending on imageArray.count) but I assume you want to scroll into them all (i.e. not an individual image) so the best thing would be to add a 'content view' (UIView) to the scroll view and then add the individual image views to that instead of the scroll view directly and size it appropriately.
Then you can return that 'content view' in the viewForZooming method.
So assuming you have created this 'content view' then the method would look like this:
func viewForZooming(in: UIScrollView) -> UIView? {
return self.contentView
}