dispatch_async UITableView ReloadData - ios

Question

I have a problem, when start the viewDidLoad method, the data is loaded and displayed correctly in UITableView but when I have to reload the data by clickPopular method, the TableView is not updated.
Any ideas on how I can do this?
viewDidLoad Method
-(void)viewDidLoad
{
Name = [[NSMutableArray alloc] init];
slug = [[NSMutableArray alloc] init];
Immagine = [[NSMutableArray alloc] init];
visite = [[NSMutableArray alloc] init];
categorie = [[NSMutableArray alloc] init];
[[NSUserDefaults standardUserDefaults] setObject:#"recent" forKey:#"settings_home_filter"];
[[NSUserDefaults standardUserDefaults] synchronize];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self LoadJson];
dispatch_async(dispatch_get_main_queue(), ^{
[tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationNone];
[tableView reloadData];
[self StopCaricamento];
});
});
}
Popular Method
-(IBAction)clickPopular:(id)sender{
[tableView reloadData];
[[NSUserDefaults standardUserDefaults] setObject:#"popular" forKey:#"settings_home_filter"];
[[NSUserDefaults standardUserDefaults] synchronize];
[self StartCaricamento];
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
[self LoadJson];
dispatch_async(dispatch_get_main_queue(), ^{
[tableView reloadSections:[NSIndexSet indexSetWithIndex:0] withRowAnimation:UITableViewRowAnimationNone];
[tableView reloadData];
[self StopCaricamento];
});
});
}
LoadJson Method
-(void)LoadJson
{
NSString *filtro = [[NSUserDefaults standardUserDefaults] objectForKey:#"settings_home_filter"];
NSString *stringachiamata = [NSString stringWithFormat:#"https://www.mywebsite.com/videos/latest?count=100&ln=en&result_type=%#", filtro];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:stringachiamata]];
[request setHTTPMethod:#"GET"];
[request setValue:#"application/json;charset=UTF-8" forHTTPHeaderField:#"content-type"];
NSError *err;
NSURLResponse *response;
NSData *responseData = [NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&err];
if(err != nil)
{
NSLog(#"Error Parsing JSON: %#", err);
}
else
{
NSDictionary *jsonArray = [NSJSONSerialization JSONObjectWithData:responseData options: NSJSONReadingMutableContainers error: &err];
array = [jsonArray objectForKey:#"videos"];
NSLog(#"%d", [array count]);
for (int i = 0; i < [array count]; i++)
{
[Name addObject:[[array objectAtIndex:i] objectForKey:#"name"]];
[slug addObject:[[array objectAtIndex:i] objectForKey:#"slug_video"]];
[Immagine addObject:[[array objectAtIndex:i] objectForKey:#"thumbnail_video_original"]];
[visite addObject:[[array objectAtIndex:i] objectForKey:#"views_video"]];
[categorie addObject:[[array objectAtIndex:i] objectForKey:#"category_name_video"]];
}
}
}
StartCaricamento and Stop Caricamento Methods
-(void)StartCaricamento{
activityImageView.hidden = NO;
[activityImageView startAnimating];
}
-(void)StopCaricamento{
[activityImageView stopAnimating];
activityImageView.hidden = YES;
}

Answer 1

you never clear the array when reloading...
meaning old entries remain upon reloading BEFORE you dispatch_async
[Name removeAllObjects];
[slug removeAllObjects];
[Immagine removeAllObjects];
[visit eremoveAllObjects];
[categorie removeAllObjects];
actually.. do it as FIRST line of -(IBAction)clickPopular:(id)sender{