How to show an image saved on Documents Directory inside local HTML? iOS

I've this app which needs to store images shown in a webview locally, and show those stored images again inside the same webview.

This what I've gotten so far...

    // After download button clicked... Store image from URL locally
    NSURL  *url = [NSURL URLWithString:myURL];
    NSData *urlData = [NSData dataWithContentsOfURL:url];
    if ( urlData )
    {
        NSArray       *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString  *documentsDirectory = [paths objectAtIndex:0];

        NSString  *filePath = [NSString stringWithFormat:@"%@/%@", documentsDirectory,@"filename.png"];
        [urlData writeToFile:filePath atomically:YES];
    }

    // Get image path from Documents Directory
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectory = [paths objectAtIndex:0];
    NSString *path = [documentsDirectory stringByAppendingPathComponent:@"filename.png"];

    // Display local html page                 
    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"revistasPhotoswipe" ofType:@"html" inDirectory:@"www"]];
    NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
    [_webView loadRequest:requestObj];

And in html file there's just a tag to show the image

   <html>
   <head></head>
   <body><img src='filename.png' /></body>
   </html>

Which is the right way to communicate the Documents Dir, with App Bundle and the HTML files to make this work? Another approach?

Solution

You can't use <body><img src='filename.png' /></body> because it references an object on a localserver that doesn't exist. You have a couple of options:

1. Javascript

A milliseconds after the page has loaded you should tell your webview to evaluate a javascript function.document["pictureIdFromProgam"].src = searchPic.src; as well as declaring your image element with <img src='throw.imgNotSet' id='pictureIdFromProgam'/>

2. String Manipulatoin

Another (less desirable, but quicker) option is to have your HTML file coded into an NSString and inserting the img link by using either replacing or %@s

Insertion:

[NSString stringWithFormat:@"<html><blah blah blah/><img src=%@/>",imagePathAsString];

and then you will be able to tell your webview to load the nsstring which contains the updated web content.