滚动视图（UIScrollView）

import UIKit
 
class ViewController: UIViewController, UIScrollViewDelegate {
     
    var scrollView:UIScrollView!
     
    override func viewDidLoad() {
        super.viewDidLoad()
         
        scrollView = UIScrollView()
        //设置代理
        scrollView.delegate = self
        scrollView.frame = self.view.bounds
        let imageView = UIImageView(image:UIImage(named:"bigpic.jpg"))
        scrollView.contentSize = imageView.bounds.size
        scrollView.addSubview(imageView)
        self.view.addSubview(scrollView)
    }
     
    //视图滚动中一直触发
    func scrollViewDidScroll(_ scrollView: UIScrollView) {
        print("x:\(scrollView.contentOffset.x) y:\(scrollView.contentOffset.y)")
    }
     
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}