//www.greatytc.com/p/5b3d1933700f 格式有点乱，整理了下

JS代码：遍历网页源码中“img” 节点，并为每个节点添加一个事件。

function setImageClickFunction(){
    
    var imgs = document.getElementsByTagName("img");
    
    for(var i=0;i<imgs.length;i++) {
        var src = imgs[i].src;
        
        imgs[i].setAttribute("onClick","getImg(src)");
    }
}

function getImg(src){
    
    var url = src;
    
    document.location = url;
}

viewDidLoad

- (void)viewDidLoad{
    [super viewDidLoad];
    
    NSURL *url = [NSURL URLWithString:@"//www.greatytc.com/p/944dbb35928e"];

    NSURLRequest *request = [NSURLRequest requestWithURL:url];

    [self.myWebView loadRequest:request];

    self.myWebView.delegate = self;

    //加载js文件
    NSString *jsStr = [NSString stringWithContentsOfURL:[[NSBundle mainBundle] URLForResource:@"Findimg" withExtension:@"js"] encoding:NSUTF8StringEncoding error:nil];

    [self.myWebView stringByEvaluatingJavaScriptFromString:jsStr];
}

delegate:

- (void)webViewDidFinishLoad:(UIWebView *)webView{
    
    NSLog(@"webViewDidFinishLoad");
    
    [webView stringByEvaluatingJavaScriptFromString:@"setImageClickFunction()"];
}

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

    NSString* path = [[request URL] absoluteString];
    NSLog(@"path: %@",path);
    
    //添加关键字进行是否跳转的筛选
    if ([path rangeOfString:@"jpg"].location != NSNotFound){

        ImgShowViewController* img = [[ImgShowViewController alloc] init];

        [self presentViewController:img animated:YES completion:nil];

        return NO;
    }else{
        
        return YES;
    }
}

在完成的时候，stringByEvaluatingJavaScriptFromString方法嵌入页面中

最后用于得到uiwebview所有的链接，yes no 决定是否跳转，判断条件可以用jpg，png后缀做判断

cell.selectionStyle=UITableViewCellSelectionStyleNone;