最近遇到关于获取webview加载网页上的点击事件，三种解决方式～～～

一、跟后台协商好，点击该按钮加载特定url，通过webview的代理方法- (BOOL)webView:(UIWebView)webView shouldStartLoadWithRequest:(NSURLRequest)request navigationType:(UIWebViewNavigationType)navigationType 判断加载的url是否是协商好的url；

- (BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType
{
    NSString *url=[NSString stringWithFormat:@"%@",request.URL];

    if([url isEqualToString:_urlStr])
    {
      return NO;
    }

    return YES;
}

ps:记得要return NO，否则会加载url

二、通过获取所点击按钮的图片来判断是否点击特定位置

1、给webview的scrollview添加手势

UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizeralloc]initWithTarget:selfaction:@selector(fakeTapGestureHandler:)];
[tapGestureRecognizer setDelegate:self];
[_webView.scrollView addGestureRecognizer:tapGestureRecognizer];

2、实现UIGestureRecognizerDelegate代理方法

- (BOOL)gestureRecognizer:(UIGestureRecognizer*)gestureRecognizer shouldReceiveTouch:(UITouch*)touch
{
    CGPoint tapPoint = [touch locationInView:_webView];
    NSString *script = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", tapPoint.x, tapPoint.y];
    NSString *eleIdStr = [_webView stringByEvaluatingJavaScriptFromString:script];

    NSLog(@"%@",eleIdStr);

    if([eleIdStr isEqualToString:@"按钮的图片url"])
    {
      //操作
    }

    return YES;// Return NO to prevent html document from receiving the touch event.
}

document.elementFromPoint 是获取点击坐标的元素

三、通过注入一段JS（需跟web前端协商），返回一段json数据
1、在webview加载完后注入js（具体根据需求定义）
例子：

[_webView stringByEvaluatingJavaScriptFromString:@"var objs = document.getElementsByClassName(\"appShare\");for(var i=0;i<objs.length;i++){var obj = objs[i];obj.href=\"kqapp://{\\\"dataapp\\\":\\\"\" + encodeURIComponent(obj.getAttribute(\"data-app\")) + \"\\\",\\\"appurl\\\":\\\"\" + encodeURIComponent(obj.getAttribute(\"app-url\")) + \"\\\",\\\"apptitle\\\":\\\"\" + encodeURIComponent(obj.getAttribute(\"app-title\")) + \"\\\",\\\"appdescription\\\":\\\"\" + encodeURIComponent(obj.getAttribute(\"app-description\")) + \"\\\",\\\"appimg\\\":\\\"\" + encodeURIComponent(obj.getAttribute(\"app-img\")) + \"\\\"}\";}"];

2、拦截自定义的字段 kqapp://

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    NSLog(@"%@",request.URL.absoluteString);
    
    NSString *urlString = [request.URL.absoluteString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    NSRange titleRange = [urlString rangeOfString:@"kqapp://"];
    if (titleRange.location != NSNotFound) {
        urlString = [urlString stringByReplacingOccurrencesOfString:@"kqapp://" withString:@""];//这个urlstring就是一段json字符串
        return NO;
    }
    
    return YES;
}