检测 UIWebView 中的点击图像答案

【问题标题】：Detect tapped image inside UIWebView检测 UIWebView 中的点击图像
【发布时间】：2014-09-18 16:55:09
【问题描述】：

我有一个 web 视图，显示由其他人完成的 html + js 介绍。当用户点击特定图像时，我需要执行 segue。我不知道javascript。如果我尝试使用 .src 返回空，如果尝试使用 .innerHTML 总是返回大量代码。我怎样才能检测到这种特定的触摸？谢谢。

- (void)viewDidLoad
{
    [super viewDidLoad];
    UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(viewTapped:)];
    [tap setDelegate:self];
    [self.webView.scrollView addGestureRecognizer:tap];

    NSString *htmlFile = [[NSBundle mainBundle] pathForResource:@"myFile" ofType:@"html" inDirectory:@"myDir"];
    NSURL* url = [[NSURL alloc]initFileURLWithPath:htmlFile];
    NSURLRequest* request = [NSURLRequest requestWithURL:url];
    [self.webView loadRequest:request];
}
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}
-(void)viewTapped:(UITapGestureRecognizer*)tap {
    CGPoint touchPoint = [tap locationInView:self.webView];
    NSString *js = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", touchPoint.x, touchPoint.y];
    NSString *urlToSave = [self.webView stringByEvaluatingJavaScriptFromString:js];
//Returning an empty string
    if (urlToSave.length > 0) {
          [self performSegueWithIdentifier:@"introToMain" sender:self];
    }

}

【问题讨论】：

标签： javascript html ios uiwebview uiwebviewdelegate

【解决方案1】：

我认为你应该让你的图片在 html 中可点击。如果是，请忽略这一点。然后你应该像这样使用 UIWebView 的 shouldStartLoadWithRequest 委托方法：

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{


    if (navigationType == UIWebViewNavigationTypeLinkClicked){

        NSURL *url = request.URL;
        //Maybe you can detect the image here looking to the url.

    }

    return YES;

}

【讨论】：