Question

I’m trying to reload a UITableView when the row of a different UITableView's row is selected. One of the problems I’m having is that both the UITableView's are in the same view. I would like a selection in Table1 to change the NSMutableArray that’s used to populate Table2. And then reload the table.

At the moment it works fine, but only when the app re-lauches (or the view is popped off the stack and then re-visited) and viewWillAppear is called again

Here’s my code:

- (void) viewWillAppear:(BOOL)animated {
    [super viewWillAppear:NO];
    [self.navigationController setNavigationBarHidden:YES animated:NO];
    self.navigationController.toolbarHidden = YES;
    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];

    // getting an NSString
    selectedTableString = [prefs stringForKey:@"selectedTableString"];
    if ([selectedTableString isEqualToString:@"Italy"]) {
        jsonStringCountry = @"http://****/v1/public/cities?country=it";
    }
    else if ([selectedTableString isEqualToString:@"Spain"]) {
        jsonStringCountry = @"http://****/v1/public/cities?country=es";
    }
    else if ([selectedTableString isEqualToString:@"UK"]) {
        jsonStringCountry = @"http://****/v1/public/cities?country=uk";
    }
    else if ([selectedTableString isEqualToString:@"Brazil"]) {
        jsonStringCountry = @"http://****/v1/public/cities?country=br";
    }
    NSLog(@"from two t selectedTableString %@",selectedTableString);

    // Download the yoodeal JSON
    NSString *jsonString = [NSString stringWithContentsOfURL:[NSURL URLWithString:jsonStringCountry] encoding:NSStringEncodingConversionAllowLossy|NSUTF8StringEncoding error:nil];
    NSLog(@"jsonStringCountry is %@", jsonStringCountry);
    NSMutableArray *itemsTMP = [[NSMutableArray alloc] init];

    // Create parser for the yoodeal api
    SBJSON *parser = [[SBJSON alloc] init];
    NSDictionary *results = [parser objectWithString:jsonString error:nil];
    itemsTMP = [results objectForKey:@"results"];
    self.displayItems = [itemsTMP copy];
}

My UITableView methods:

- (int)numberOfSectionsInTableView:(UITableView *)tableView {
    return 1;
}
- (int)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    return [displayItems count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MainCell"];
    if(cell == nil){
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"MainCell"];
    }

    // Get item from tableData
    NSDictionary *item = (NSDictionary *)[displayItems objectAtIndex:indexPath.row];
    cell.textLabel.text = [item objectForKey:@"name"];
    [cell.textLabel setFont:[UIFont fontWithName: @"Asap-Bold" size: 14.0f]];
    return cell;
}

Answer 1

You’ll need to use the delegate method of UITablveView. The method is:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

This methods gets called when you click on the row of UITableView. Use this in following manner:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   if(tableView == Table1)
   {
        //do the changes in array you want to do.
        [table2 reloadData];
   }
   else
   {
        //do the changes in array you want to do.
        [table1 reloadData];
   }
}