UIImageView pinch zoom swift

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UIImageView pinch zoom with UIScrollView || image zooming ios in swift 3 and Xcode 8 letter Youtube video URL

set uiscrollview Delegate in storyboard
enter image description here

 class PhotoDetailViewController: UIViewController, UIScrollViewDelegate {

    @IBOutlet weak var scrollView: UIScrollView!
    @IBOutlet weak var imgPhoto: UIImageView!
      
    override func viewDidLoad() {
        
        super.viewDidLoad()
    
        scrollView.minimumZoomScale = 1.0
        scrollView.maximumZoomScale = 6.0        
        // scrollView.delegate = self - it is set on the storyboard.
    }  
        
    func viewForZooming(in scrollView: UIScrollView) -> UIView? {
       
        return imgPhoto
    }

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