ios 点击webview获取图片url （js交互）

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-(void)handleSingleTap:(UITapGestureRecognizer *)sender
{
    CGPoint pt = [sender locationInView:_contentWebView];
    NSString *imgURL = [NSString stringWithFormat:@"document.elementFromPoint(%f, %f).src", pt.x, pt.y];
    NSString *urlToSave = [_contentWebView stringByEvaluatingJavaScriptFromString:imgURL];
    if (urlToSave.length > ) {
        //发送图片请求
        NSLog(@"urlToSave :图片请求%@",urlToSave);
        self.imageStr = [NSString stringWithFormat:@"%@",urlToSave];
        [self getImageNum];
    }
}