在UIWebView中截取图像中的链接 [英] Intercepting links in images in UIWebView

问题描述

在我的应用程序中，我有一个webview，并希望打开在一个单独的视图控制器中的网页中加载的图像，这是好的，我需要做的是获取的图像源的URL，加载它在一个不同的视图控制器，我可以做。

In my app, I have a webview, and wanted to open images loaded in a webpage in a separate view controller, which is fine, all I need to do is get the URL to the source of the image & load it in a different view controller, which I can do.

这是我使用的代码来获取图像的源。

Here is the code I'm using to get the URL to the source of the image.

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {
        CGPoint touchPoint = [touch locationInView:self.view];

        NSString *imageSRC = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", touchPoint.x, touchPoint.y];
        NSString *srcOfImage = [webView stringByEvaluatingJavaScriptFromString:imageSRC];
        NSLog(@"src:%@",srcOfImage);
    }
    return YES;
}

现在，我的问题是，有时，当一个图像可能有一个链接ie标签），webview将加载链接，而图像在我的单独的视图控制器中打开。我想做的是，停止webview打开链接（只有图像中的）如果存在。

Now, my question is, sometimes, when an image might have a link (i.e. tag) with it, the webview will load the link while the image opens in my separate view controller. What I would like to do is, stop the webview from opening the link (only the ones in the images) if one exists. Any pointers to how I may go about accomplishing that?

推荐答案

最后想出来，UIWebViewDelegate中的答案。对任何有兴趣的人，这是我如何解决它..

Finally figured it out, the answer lied in UIWebViewDelegate. For anyone who's interested, here's how I solved it..

bool isImage;

-(BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    if ([gestureRecognizer isKindOfClass:[UITapGestureRecognizer class]]) {
        CGPoint touchPoint = [touch locationInView:self.view];

        NSString *imageSRC = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", touchPoint.x, touchPoint.y];
        NSString *srcOfImage = [webView stringByEvaluatingJavaScriptFromString:imageSRC];
        NSLog(@"src:%@",srcOfImage);
        NSURL *imgsrcURL = [NSURL URLWithString:srcOfImage];
        if (imgsrcURL && imgsrcURL.scheme && imgsrcURL.host) {
            isImage = TRUE;
        }
    }
    return YES;
}

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
    if ((navigationType == UIWebViewNavigationTypeLinkClicked) && (isImage)) {
        return NO;
        isImage = FALSE;
    } else {
        return YES;
    }
}

这篇关于在UIWebView中截取图像中的链接的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！