UIScrollView - Zoom in/zoom out and scroll/move an image with ScrollView

1. Drag a UIScrollView to the storyboard.

2. Control-drag the UIScrollView to

    @IBOutlet weak var myUIScrollView: UIScrollView!


3. Complete the code as below:

import UIKit

class ViewController: UIViewController, UIScrollViewDelegate {

    @IBOutlet weak var myUIScrollView: UIScrollView!

    

    var myUIImageView: UIImageView!

    

    override func viewDidLoad() {

        super.viewDidLoad()

        

        self.myUIScrollView.maximumZoomScale = 5.0

        self.myUIScrollView.minimumZoomScale = 0.5

        self.myUIScrollView.delegate = self

        

        myUIImageView = UIImageView(image: UIImage(named: "big_image.png"))

        self.myUIScrollView.addSubview(myUIImageView)

    }

    func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {

        return myUIImageView

    }