ios - 在 UIWebView 上拉动刷新？

Question

我正在尝试拉动以刷新我加载网站的 UIWebView。UIWebView 的代码非常简单

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var WebView: UIWebView!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        let URL = NSURL(string: "https://the url/")

        WebView.loadRequest(NSURLRequest(URL: URL!))

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }    
}

有没有人有任何示例，因为无论我搜索什么，我只发现在 tableviews 上拉动刷新，我不确定它是否也适用于这个。

谢谢。

更新1.经过Sohil的建议，代码是这样的

import UIKit

class ViewController: UIViewController {

    @IBOutlet weak var WebView: UIWebView!
    @IBOutlet weak var scrollView: UIScrollView!
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        let URL = NSURL(string: "https://iremember.gr/")

        WebView.loadRequest(NSURLRequest(URL: URL!))
    }




    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
        func scrollViewWillEndDragging(scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {

            if (scrollView.contentOffset.y < 0){
                //reach top
                print("Reach Top")
                WebView.reload()
            }
            else {
                print("nothing")
            }
        }
    }

}

但是当我尝试重新加载它时它甚至没有打印“nothing”。

Answer 1

您可以使用 UIScrollView 来完成该任务。首先，您需要检查用户是否正在拉动 UIWebView“向上”或“向下”，因为下面的代码将有助于查看并重新加载 UIWebView:

func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {

     if (scrollView.contentOffset.y < 0){
     //reach top
          print("Reach Top")
          webView.reload()
     }
 }

确保您已将委托(delegate)添加到 UIScrollView:

webView.scrollView.delegate = self

希望这对您有所帮助!