Create README.md

Isn't it interesting to do so?. And i love the way it is. In the following steps i will explain you the steps reading json file.




my sample json file is here sample.json




{"books":
[
     { 
     "name" : "A Bend in the river", 
     "author" : "V.S. Naipaul", 
     "id" : "01" , 
      "coverurl" :"http://myiosapps.comuf.com/mySampleProjects/jsonTutorial/1.jpeg"
      },
     { 
     "name" : "Baburnama", 
     "author" : "Babur", 
     "id" : "02" , 
      "coverurl":"http://myiosapps.comuf.com/mySampleProjects/jsonTutorial/2.jpeg"
      },
     { 
     "name" : "The secret", 
     "author" : "Acharya Rajneesh", 
     "id" : "03" , 
      "coverurl" :"http://myiosapps.comuf.com/mySampleProjects/jsonTutorial/3.jpeg"
      },
{ 
     "name" : "Bermuda Triangle", 
     "author" : "Charles Berlitz", 
     "id" : "04" , 
      "coverurl" :"http://myiosapps.comuf.com/mySampleProjects/jsonTutorial/4.jpeg"
      },




{ 
     "name" : "Eye of the Storm", 
     "author" : "Patrick White", 
     "id" : "05" , 
      "coverurl" :"http://myiosapps.comuf.com/mySampleProjects/jsonTutorial/5.jpeg"
      }




  ]
}
Step 1: First thing,make sure you have the json library,if not get it from here JSON. and drag all the classes into your project.




Step 2: In the header just include the JSON.h.Now lets get into the coding part.




Step 3: In the viewdidload,lets download the sample.json file,which is kept in the server
NSData* tmpData = [NSData dataWithContentsOfURL:[NSURL URLWithString:@"Ur json file url goes here"]];
    
    NSString* cacheDir = CacheDirectory;
    NSString* cachePath = [cacheDir stringByAppendingPathComponent:@"sample.json"];
    
    if (!tmpData){
        // attempt to get the data from the cache
        tmpData = [NSData dataWithContentsOfFile:cachePath];
    }
     
    [tmpData writeToFile:cachePath atomically:YES];
    NSString *jsonString = [[NSString alloc] initWithData:tmpData encoding:NSASCIIStringEncoding];
    NSDictionary *results = [jsonString JSONValue];
    NSArray * json_issues = [NSArray arrayWithArray: [results objectForKey:@"books"]];
    
    books = [[NSArray alloc] initWithArray:json_issues];




books has all values retrieved from json file.Now thats done,all we need to do is,just need to extract value for each key element from the dictionary object.




-(NSDictionary *)bookAtIndex:(NSInteger)index {
    return [books objectAtIndex:index];
}
-(NSString *)authorNameAtIndex:(NSInteger)index {
    return [[self bookAtIndex:index] objectForKey:@"name"];
}
-(NSString *)bookUrlAtIndex:(NSInteger)index {
    return [[self bookAtIndex:index] objectForKey:@"coverurl"];
}




-(NSString *)bookNameAtIndex:(NSInteger)index {
    return [[self bookAtIndex:index] objectForKey:@"author"];
}








Step 4: Now passing those strings to UITableView cell is not a big deal.Note that you need include UITableViewDataSource and UITableViewDelegates.
- (UITableViewCell *)tableView:(UITableView *)tableView2 cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"bookCell";
    
    UITableViewCell *cell = [tableView2 dequeueReusableCellWithIdentifier:CellIdentifier];
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellSelectionStyleNone reuseIdentifier:CellIdentifier];
    }
    //cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
    NSURL *url=[NSURL URLWithString:[self bookUrlAtIndex:indexPath.row]];
   
 //Need to include ImageDownloader class
    ImageDownloader *imageView = [[ImageDownloader alloc] initWithFrame:CGRectMake(10, 5,120, 100)];
    //imageView.contentMode = UIViewContentModeScaleAspectFill;
    imageView.clipsToBounds = YES;
    imageView.tag = IMAGE_VIEW_TAG;
   
   [[ImageLoader sharedLoader] cancelLoadingURL:imageView.imageURL];
    
    //load the image
    imageView.imageURL = url;
     [cell addSubview:imageView];
    UILabel *authorLabel=[[UILabel alloc]initWithFrame:CGRectMake(140, 30, 200, 20)];
    authorLabel.text=[self authorNameAtIndex:indexPath.row];
    authorLabel.textColor=[UIColor blackColor];
    authorLabel.textAlignment=NSTextAlignmentLeft;
    




    [cell addSubview:authorLabel];
    UILabel *bookLabel=[[UILabel alloc]initWithFrame:CGRectMake(140, 60, 200, 20)];
    bookLabel.text=[self bookNameAtIndex:indexPath.row];
    bookLabel.textColor=[UIColor blackColor];
    bookLabel.textAlignment= NSTextAlignmentLeft;
    bookLabel.font=[UIFont fontWithName:@"Helvetica" size:12];
    [cell addSubview:bookLabel];
    return cell;
}