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这篇文章主要介绍了JS交互点击WKWebView中的图片实现预览效果,需要的朋友可以参考下
1.注入js代码 （重点）
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 + '+';" +
"};" +
"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('img');" +
"var length=imgs.length;" +
"for(var i=0;i<length;i++){" +
"img=imgs[i];" +
"img.onclick=function(){" +
"window.location.href='image-preview:'+this.src}" +
"}" +
"}"
webView.evaluateJavaScript(jsClickImage, completionHandler: nil)
webView.evaluateJavaScript("registerImageClickAction()", completionHandler: nil)
}
2.使用SKPhotoBrowser框架实现图片预览功能
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
}
总结
以上所述是小编给大家介绍的JS交互点击WKWebView中的图片实现预览效果，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对脚本之家网站的支持！ | 
发表于 2018-1-5 10:36:08
