UIWebView如何侦测< img src =" ..." />被挖掘 [英] How UIWebView detect <img src="..." /> is tapped

问题描述

我知道下面的方法可以检测到链接元素点击。但是我想知道 UIView 是否可以检测到是否点击 img 元素？

   - （BOOL）webView：（UIWebView *）webView shouldStartLoadWithRequest：（NSURLRequest *）请求导航类型：（UIWebViewNavigationType）navigationType {
 switch（navigationType） {
 case UIWebViewNavigationTypeLinkClicked：
 NSLog（@link is click）; 
 //做某事
 break; 
默认值：
 break; 
} 
 
返回true; 
} 
  

一些html代码如下：

 < p> xxxxxxxxx< / p> 
< p>< img src =http://imgs.ebrun.com/resources/2015_06/2015_06_16/201506167911434413787546.jpg> < / p为H. 
< p> xxxxxxxxx。< / p> 
< p>< img src =http://imgs.ebrun.com/resources/2015_06/2015_06_16/201506167911434413787546.jpg> < / p为H. 
< p> xxxxxxxxx。< / p> 
  

你能告诉我如何使用示例代码吗？谢谢。

您的img标签没有html点击事件。如果您可以像下面这样制作图片 -

 < p> xxxxxxxxx< / p> 
< p>< img src =http://imgs.ebrun.com/resources/2015_06/2015_06_16/201506167911434413787546.jpgonclick =myfunction（）> < / p为H. 
< p> xxxxxxxxx。< / p> 
< p>< img src =http://imgs.ebrun.com/resources/2015_06/2015_06_16/201506167911434413787546.jpgonclick =myfunction（）> < / p为H. 
< p> xxxxxxxxx。< / p> 
  

然后，您可以在UIWebView Delegate方法中捕获您的img click事件 - shouldStartLoadWithRequest。

其他可能的选项 -

否则，您已经编写了一个JavaScript方法，它将OnClick方法动态添加到所有IMG标签。当你的页面加载到UIWebView中时调用这个javascript方法 -

   - （void）webViewDidFinishLoad：（UIWebView *）webView 
 {
 //执行javascript方法或纯JavaScript如果需要的话
 [_webView stringByEvaluatingJavaScriptFromString：@methodName（）;]; 
} 
  

I know that method below can detect a link element tap. But I want to know if the UIView can detect if the img element is tapped?

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{
switch (navigationType) {
    case UIWebViewNavigationTypeLinkClicked:
        NSLog(@"link is click");
        //do something
        break;
    default:
        break;
   }

    return true;
}

Some html source like below:

<p>xxxxxxxxx</p>
<p><img src="http://imgs.ebrun.com/resources/2015_06/2015_06_16/201506167911434413787546.jpg"> </p>
<p>xxxxxxxxx。</p>
<p><img src="http://imgs.ebrun.com/resources/2015_06/2015_06_16/201506167911434413787546.jpg"> </p>
<p>xxxxxxxxx。</p>

Could you show me how to do it using sample code? Thanks.

解决方案

Your img tag does not have html click event. If you can make your image like below way -

<p>xxxxxxxxx</p>
<p><img src="http://imgs.ebrun.com/resources/2015_06/2015_06_16/201506167911434413787546.jpg" onclick="myfunction()"> </p>
<p>xxxxxxxxx。</p>
<p><img src="http://imgs.ebrun.com/resources/2015_06/2015_06_16/201506167911434413787546.jpg" onclick="myfunction()"> </p>
<p>xxxxxxxxx。</p>

Then you can catch your img click event within UIWebView Delegate method - shouldStartLoadWithRequest.

Alternate possible option -

Otherwise you have write a javascript method which dynamically add OnClick method to all IMG tags. And call this javascript method when your page load in UIWebView -

- (void) webViewDidFinishLoad:(UIWebView *)webView
{
    //Execute javascript method or pure javascript if needed
    [_webView stringByEvaluatingJavaScriptFromString:@"methodName();"];
}

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