Table View不会从Parse.com重新加载数据

Question

I have a little problem. So here it is:

I have a UIViewController with a UITableView (delegate and datasource set). In my ViewDidLoad i query all the data from Parse.com and store it in multiple NSMutableArrays (i initialize before adding object to them)

viewDidLoad :

PFQuery *query = [PFQuery queryWithClassName:@"PlacesClass"];
        [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
            if (!error) {
                for (PFObject *object in objects) {
                    [titlesArray addObject:object[@"PlaceName"]];
                    [thumbnailsArray addObject:object[@"PlaceImageURL"]];      
                 }
                finishedLoading = YES;
                [self.tableView reloadData];
            } else
                NSLog(@"Error: %@ %@", error, [error userInfo]);
        }];

It's working great. It shows the data correctly in the TableView. However, I have a sliding menu with a TableView with some categories. When you tap on one of the categories I do a query again to get all objects with a specific category, like this:

-(void)searchWithCategory{

AppDelegate * delegate = DELEGATE;
_categoryToSearch = delegate.categoryToSearch;

PFQuery *query = [PFQuery queryWithClassName:@"PlacesClass"];
[query whereKey:@"Category" equalTo:_categoryToSearch];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
    if (!error) {

        NSMutableArray *titlesArray2 = [[NSMutableArray alloc]init];
        NSMutableArray *thumbnailsArray2 = [[NSMutableArray alloc]init];
        NSMutableArray *facebookArray2 = [[NSMutableArray alloc]init];
        NSMutableArray *twitterArray2 = [[NSMutableArray alloc]init];
        NSMutableArray *addressArray2 = [[NSMutableArray alloc]init];
        NSMutableArray *descriptiomArray2 = [[NSMutableArray alloc]init];
        NSMutableArray *locationArray2 = [[NSMutableArray alloc]init];

        for (PFObject *object in objects) {
            [titlesArray2 addObject:object[@"PlaceName"]];
            [thumbnailsArray2 addObject:object[@"PlaceImageURL"]];
            [facebookArray2 addObject:object[@"PlaceFacebookAddress"]];
            [twitterArray2 addObject:object[@"PlaceTwitterAddress"]];
            [addressArray2 addObject:object[@"PlaceAddress"]];
            [descriptiomArray2 addObject:object[@"PlaceDescription"]];
            [locationArray2 addObject:object[@"PlaceLocation"]];
        }

        titlesArray = titlesArray2;
        thumbnailsArray = thumbnailsArray2;
        descriptiomArray = descriptiomArray2;
        facebookArray = facebookArray2;
        twitterArray = twitterArray2;
        addressArray = addressArray2;
        locationArray = locationArray2;

        finishedLoading = YES;
        dispatch_async(dispatch_get_main_queue(), ^{
            [self.tableView reloadData];
        });

    } else 
        NSLog(@"Error: %@ %@", error, [error userInfo]);
}];
}

I call this method from the sliding view controller's class when a category is selected. I NSLogged the arrays and the new data is correct. It shows the right objects from the specific category.

However the TableView doesn't reload. I run reloadData on the main thread and i still get no signal from cellForRowAtIndexPath or numbersOfRowsInSection . I am using a custom UITableViewCell. I don't know if it's related to this, but i tried with simple UITableViewCells and it's still the same issue. The TableView reloads only when displaying data for the first time.

This is how I call the searchWithCategory method from the sliding menu view controller:

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
      AppDelegate * delegate = DELEGATE;
      delegate.categoryToSearch = [_categoriesNames objectAtIndex:indexPath.row];

      PlacesViewController *pvc = [[PlacesViewController alloc]init];
     [pvc searchWithCategory];

}

Do you guys have any suggestions on how to solve this ? I am stucked with this for about 4 days. Thank you a lot for reading my question!

EDIT: My cellForRowAtIndexPath method:

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    customCell = (PlacesTableViewCell *)[tableView dequeueReusableCellWithIdentifier: @"PlacesTableViewCell"];
    if (customCell == nil)
    {
        NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"PlacesTableViewCell" owner:self options:nil];
        customCell = [nib objectAtIndex:0];
    }

    if(finishedLoading == YES){
        customCell.placeName.text = [titlesArray objectAtIndex:indexPath.row];
        UIImage *image = [UIImage imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:[thumbnailsArray objectAtIndex:indexPath.row]]]];
        customCell.thumbnail.image = image;
     }

    if(indexPath.row == titlesArray.count-1)
        finishedLoading = NO;

    return customCell;
    }

Answer 1

From your code:

You are actually using titlesArray for populating data to tableView . Although I am still not very sure about the problem but I can provide you a check list, check below :

• Check if parse returning data (print parse data count after it is retrieved)
• Then check if you have initialize your array before adding data to it
• Then check if titlesArray have data in it (print it)
• Check if you are returning numberOfRowInSection from titlesArray.count

Try these, hope it will help.

Answer 2

Just to clarify your code.
In the didSelectRowAtIndexPath you are initializing PlacesViewController and then running [pvc searchWithCategory]; Is implementation of searchWithCategory method in a different file?
Are the properties titlesArray thumbnailsArray etc... global variables? Why would you need to initialize PlacesViewController ?

I am guessing this is an IPAD app and you are in the splitviewcontroller so you can see both controllers? The PlacesViewController has it's own tableview?

[self.tableview reload] 

that is called in -(void)searchWithCategory which tableView you are referring?