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PORead JSON file from documents folder iOS with javascript
 

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    <p>In my app I need to read a JSON file stored in Documents folder of my iPhone. I saw that exist a method to bridge javascript and objective C. How I can do that? I understand that i should use this method in objective C <code>- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType;</code>, but what I should write in javascript? I found this: <a href="http://blog.techno-barje.fr/post/2010/10/06/UIWebView-secrets-part3-How-to-properly-call-ObjectiveC-from-Javascript/" rel="nofollow">call objective C method from javascript</a>, but I didn't understand how it works. In my app I've to do this:</p> <ol> <li>Reach an offer from a mobile site (I made some little mobile site)</li> <li>I store the mobile site local in the Documents folder of my iPhone</li> <li>I generate a JSON file to keep the name, the path and the expire date for the offer. I stored this JSON in Documents folder of my iPhone</li> <li>My app has an "archive" view controller, in which I load a mobile site in which I will to list all offer stored in the device by reading the JSON created</li> </ol> <p>I made the native app and it works, now I've to implement the method to read the JSON file from Documents folder can anyone help me to do this operation? How I can read the JSON from javascript, parse it and show the result in an html dynamic list?</p> <p>Thank you</p> <p>CODE UPDATE: for now I wrote this code:</p> <p><strong>Objective C snippet</strong></p> <pre><code>- (void)parseJson { // Carico il documento JSON dalla cartella documents NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; NSString *filePath = [documentsDirectory stringByAppendingPathComponent:@"data.json"]; BOOL fileExist = [[NSFileManager defaultManager] fileExistsAtPath:filePath]; if (fileExist) { NSString *content = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:NULL]; NSData *data = [content dataUsingEncoding:NSUTF8StringEncoding]; NSDictionary *dictContent = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil]; if (dictContent) { NSDictionary *sites = [dictContent objectForKey:@"sites"]; NSArray *site = [sites objectForKey:@"site"]; NSMutableArray *names = [[NSMutableArray alloc]init]; NSMutableArray *srcs = [[NSMutableArray alloc]init]; for (int i = 0; i &lt; [site count]; i++) { NSDictionary *dictData = [site objectAtIndex:i]; [names addObject:[dictData objectForKey:@"name"]]; [srcs addObject:[dictData objectForKey:@"src"]]; }; NSString *javascriptString = [NSString stringWithFormat:@"dataFromObjC([%@, %@])", names, srcs]; [self.webView stringByEvaluatingJavaScriptFromString:javascriptString]; } } else { UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Promo" message:@"Non hai ancora salvato nessuna promozione!" delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil]; [alert show]; } // Faccio il parse del documento JSON // Passo le informazioni parsate al javascript } </code></pre> <p>In javascript I made a function named <code>dataFromObjC(names, srcs)</code>. Below you will find the html code to see what I made:</p> <p><strong>Html code</strong></p> <pre><code>&lt;!DOCTYPE html&gt; &lt;html lang="it"&gt; &lt;head&gt; &lt;meta charset="utf-8" /&gt; &lt;meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; user-scalable=0;"/&gt; &lt;title&gt;Lista coupon&lt;/title&gt; &lt;script src="../js/jquery-1.9.1.min.js" type="text/javascript"&gt;&lt;/script&gt; &lt;script src="../js/memoria.js" type="text/javascript"&gt;&lt;/script&gt; &lt;script type="text/javascript"&gt; function dataFromObjC(names, srcs) { alert(names); alert(srcs); } &lt;/script&gt; &lt;style type="text/css"&gt; body { background-color: #000000; width: 100%; height: 100%; padding: 0; margin: 0; } ul { list-style-type: none; padding: 5px; } li { color: #FFFFFF; font-family: sans-serif; padding-bottom: 5px; } p { color: #FFFFFF; font-family: sans-serif; padding: 5px; text-align: center; } a { text-decoration: none; color: #FFFFFF; } &lt;/style&gt; &lt;/head&gt; &lt;body onload="loadJson();"&gt; &lt;div id="header"&gt; &lt;/div&gt; &lt;div id="content"&gt; &lt;p&gt;Di seguito trovi tutte le promozioni salvate&lt;/p&gt; &lt;div id="list"&gt; &lt;/div&gt; &lt;/div&gt; &lt;div id="footer"&gt; &lt;/div&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>I hope this will be useful to solve it. I used the <code>stringByEvaluatingJavaScriptFromString</code>, because I found on here a post to read data from objective C to javascript.</p>
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