JSON Data in Table View iOS loaded

Question

I can parse data and see the output also but I am not able to display them in table view when I call the view that contain JSON the application is crashed

This is my code:

In the first line of code we define a macro that gives us back a background queue – I like having a kBgQueue shortcut for that, so I can keep my code tighter. In the second line of code we create a macro named kLatestKivaLoansURL which returns us an NSURL pointing to this URL http://api.kivaws.org/v1/loans/search.json?status=fundraising.

#define kBgQueue dispatch_get_global_queue(
 DISPATCH_QUEUE_PRIORITY_DEFAULT, 0) //1
#define kLatestKivaLoansURL [NSURL URLWithString: 
 @"http://api.kivaws.org/v1/loans/search.json?status=fundraising"] //2
 @interface TeacherViewController ()
   @end
@implementation TeacherViewController

- (id)initWithStyle:(UITableViewStyle)style
{
    self = [super initWithStyle:style];
    if (self) {
        // Custom initialization
    }
    return self;
}

Defined kBGQueue as a macro which gives us a background queue?

- (void)viewDidLoad

{
    [super viewDidLoad];

    dispatch_async(kBgQueue, ^{
        NSData* data = [NSData dataWithContentsOfURL:kLatestKivaLoansURL];
        [self performSelectorOnMainThread:@selector(fetchedData:)
                               withObject:data waitUntilDone:YES];
    });

}
@synthesize latestLoans;
@synthesize arrayOfFighterName;

Will be called and the NSData instance will be passed to it. In our case the JSON file is relatively small so we’re going to do the parsing inside fetchedData: on the main thread. If you’re parsing large JSON feeds (which is often the case), be sure to do that in the background.

- (void)fetchedData:(NSData *)responseData {
    //parse out the json data
    NSError* error;
    NSDictionary* json = [NSJSONSerialization
                          JSONObjectWithData:responseData //1
                          options:kNilOptions
                          error:&error];

     latestLoans = [json objectForKey:@"loans"]; //2
    arrayOfFighterName=[[NSMutableArray alloc] init];
//NSLog(@"loans: %@", latestLoans); //3
    for( int i = 0; i<[latestLoans count]; i++){

        // NSLog(@"%@", [matchListArray objectAtIndex:i]);
        arrayOfFighterName[i]=[[latestLoans objectAtIndex:i] objectForKey:@"name"];
       // NSLog(@"%@", [arrayOfFighterName objectAtIndex:i]);
    }



}
- (void)viewDidUnload
{

    [super viewDidUnload];
    latestLoans = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
#warning Potentially incomplete method implementation.
    // Return the number of sections.
    return 1;

}

Displaying the result in table view but unfortunately the result does not display and the app is crashed

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
#warning Incomplete method implementation.
    // Return the number of rows in the section.
   return [arrayOfFighterName count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView
                           dequeueReusableCellWithIdentifier:@"TeacherCell"];
            cell.textLabel.text = [arrayOfFighterName objectAtIndex:indexPath.row];
       return cell;


   //  NSLog(@"viewDidLoad is called");
}

/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the specified item to be editable.
    return YES;
}
*/

/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
    if (editingStyle == UITableViewCellEditingStyleDelete) {
        // Delete the row from the data source
        [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
    }   
    else if (editingStyle == UITableViewCellEditingStyleInsert) {
        // Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
    }   
}
*/

/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/

/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Return NO if you do not want the item to be re-orderable.
    return YES;
}
*/

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    // Navigation logic may go here. Create and push another view controller.
    /*
     <#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:@"<#Nib name#>" bundle:nil];
     // ...
     // Pass the selected object to the new view controller.
     [self.navigationController pushViewController:detailViewController animated:YES];
     */
}

@end

JSON Data in Table View iOS loaded

Answers (1)

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