JS interactively clicks on the picture in WKWebView and previews the example

This article mainly introduces JS interactive clicking on pictures in WKWebView to achieve preview effects. Friends who need it can refer to it. I hope it can help everyone.

• Swift 4.0

• WKWebView

1. Inject js code (emphasis)

func webView(_ webView: WKWebView, didFinish navigation: WKNavigation!) {
  let jsGetImages =
    "function getImages(){" +
    "var objs = document.getElementsByTagName(\"img\");" +
    "var imgScr = '';" +
    "for(var i=0;i<objs.length;i++){" +
    "imgScr = imgScr + objs[i].src + &#39;+&#39;;" +
    "};" +
    "return imgScr;" +
    "};"
  webView.evaluateJavaScript(jsGetImages, completionHandler: nil)
  webView.evaluateJavaScript("getImages()") { (data, err) in
    let imageUrl:String = data as! String
    var urlArry = imageUrl.components(separatedBy: "+")
    urlArry.removeLast()
    self.imgUrlArray.addObjects(from: urlArry)
    for url in self.imgUrlArray{
      let photo = SKPhoto.photoWithImageURL(url as! String)
      photo.shouldCachePhotoURLImage = false // you can use image cache by true(NSCache)
      self.images.append(photo)
    }
  }
  var jsClickImage:String
  jsClickImage = 
    "function registerImageClickAction(){" +
    "var imgs=document.getElementsByTagName(&#39;img&#39;);" +
    "var length=imgs.length;" +
    "for(var i=0;i<length;i++){" +
    "img=imgs[i];" +
    "img.onclick=function(){" +
    "window.location.href=&#39;image-preview:&#39;+this.src}" +
    "}" +
    "}"
  webView.evaluateJavaScript(jsClickImage, completionHandler: nil)
  webView.evaluateJavaScript("registerImageClickAction()", completionHandler: nil)
}

2. Use the SKPhotoBrowser framework to implement the image preview function

func webView(_ webView: WKWebView, decidePolicyFor navigationAction: WKNavigationAction, decisionHandler: @escaping (WKNavigationActionPolicy) -> Void) {
  let requestString = navigationAction.request.url?.absoluteString
  print(requestString!)
  if (requestString?.hasPrefix("image-preview"))!{
    let imgUrl = NSString.init(string: requestString!).substring(from: "image-preview:".count )
    let index = imgUrlArray.index(of: imgUrl)
    let browser = SKPhotoBrowser(photos: images)
    browser.initializePageIndex(index)
    present(browser, animated: true, completion: {})
  }
  decisionHandler(.allow) //一定要加上这句话 
}

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