在 WebView Swift 5 中拉动刷新

问题描述

尝试实现刷新WebView URL的选项没有成功，到目前为止我有这个

class ViewController2: UIViewController {

@IBOutlet var webview2: WKWebView!

override func viewDidLoad() {
    super.viewDidLoad()
    webview2.load(URLRequest(url: URL(string: "https://coinmarketcap.com/")!))
    
}


//Pull to Refresh
func scrollViewWillEndDragging(_ scrollView: UIScrollView,withVeLocity veLocity: CGPoint,targetContentOffset: UnsafeMutablePointer<CGPoint>) {

     if (scrollView.contentOffset.y < 0){
     //reach top
          print("Reach Top")
          webview2.reload()
     }
 }   
}

谁能告诉我为什么它不起作用？我是新来的

解决方法

在意识到我犯了一些错误后，我找到了解决方案。刷新 WebView 的正确代码是：

class ViewController2: UIViewController {

@IBOutlet var webview2: WKWebView!
@objc let refreshControl = UIRefreshControl()

override func viewDidLoad() {
    super.viewDidLoad()
    webview2.load(URLRequest(url: URL(string: "https://coinmarketcap.com/")!))
    
    webview2.scrollView.bounces = true
    let refreshControl = UIRefreshControl()
    refreshControl.addTarget(self,action: #selector(ViewController2.refreshWebView),for: UIControl.Event.valueChanged)
    webview2.scrollView.addSubview(refreshControl)
}

@objc func refreshWebView(sender: UIRefreshControl) {
    webview2.load(URLRequest(url: URL(string: "https://coinmarketcap.com/")!))
    sender.endRefreshing()
}
}