如何在 WebView 中添加 Pull to Refresh？

Question

我对开发很陌生。我正在构建一个 WebView，我希望它具有拉动刷新功能。我该如何快速做到这一点？

我在视图控制器中的代码是

@IBOutlet var webView: UIWebView!

override func viewDidLoad() {
    super.viewDidLoad()

    func webViewDidFinishLoad(webView: UIWebView) {
        UIApplication.sharedApplication().networkActivityIndicatorVisible = false
    }

    func webViewDidStartLoad(webView: UIWebView) {
        UIApplication.sharedApplication().networkActivityIndicatorVisible = true
    }

    let url = NSURL (string: "https://www.foo.com");
    let requestObj = NSURLRequest(URL: url!);
    webView.loadRequest(requestObj);
    NSUserDefaults.standardUserDefaults().registerDefaults(["UserAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/601.5.17 (KHTML, like Gecko) Version/9.1 Safari/601.5.17"])
}


override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()

}

Answer 1

您的代码有问题，您在ViewDidLoad必须遵循的方法旁边添加了两个 Web 视图 Delegate，并检查以下viewDidLoad代码以在 Web 视图中添加 Pull to Refresh：

@IBOutlet var webView: UIWebView!

 var refController:UIRefreshControl = UIRefreshControl()

 override func viewDidLoad() {
    super.viewDidLoad()


    let url = NSURL (string: "https://www.foo.com");
    let requestObj = NSURLRequest(URL: url!);
    webView.loadRequest(requestObj);
    NSUserDefaults.standardUserDefaults().registerDefaults(["UserAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/601.5.17 (KHTML, like Gecko) Version/9.1 Safari/601.5.17"])



    refController.bounds = CGRectMake(0, 50, refController.bounds.size.width, refController.bounds.size.height) 
    refController.addTarget(self, action: Selector("mymethodforref:"), forControlEvents: UIControlEvents.ValueChanged)
    refController.attributedTitle = NSAttributedString(string: "Pull to refresh")
    webView.scrollView.addSubview(refController)
    }



    func mymethodforref(refresh:UIRefreshControl){
      webView.reload()
      refController.endRefreshing()
   }
    func webViewDidFinishLoad(webView: UIWebView) {
        UIApplication.sharedApplication().networkActivityIndicatorVisible = false
    }

    func webViewDidStartLoad(webView: UIWebView) {
        UIApplication.sharedApplication().networkActivityIndicatorVisible = true
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }

}