Question

Hello I am brand new to xCode and iPhone development. I have two different TableView controls on one page. I have NSArray #1 that needs to be the datasource of TableView #1 and NSArray #2 that needs to be the datasource for TableView #2.

The only trouble is that NSArray#1 populates both TableView1 and TableView2. I looked through the code and can’t seem to find where you can distinguish which NSArray belongs to each TableView.

Any help will be appreciated. Thanks in advance!

@interface GrainBinContentsEstimatorViewController : UIViewController
<UITableViewDelegate, UITableViewDataSource>
{
    UITableView *tableViewGrainBinType;
    UITableView *tableViewGrainType;
}

@property (strong, nonatomic) NSArray *arrayGrainBinTypes;
@property (strong, nonatomic) NSArray *arrayGrainTypes;
@property (nonatomic, retain) UITableView *tableViewGrainBinType;
@property (nonatomic, retain) UITableView *tableViewGrainType;

@implementation GrainBinContentsEstimatorViewController
@synthesize arrayGrainBinTypes, arrayGrainTypes, tableViewGrainBinType, tableViewGrainType;

- (void)viewDidLoad
{
    [super viewDidLoad];
    self.arrayGrainBinTypes = [[NSArray alloc]
                       initWithObjects:@"RF", @"RC45", @"RC60", nil];

    self.arrayGrainTypes = [[NSArray alloc]
                            initWithObjects:@"Wheat", @"Corn", @"Soybeans", @"Rice", @"Milo", @"Barley", nil]; 
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section{
    return @"Select Bin Type";
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return [self.arrayGrainBinTypes count];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc]
                initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
    }

    cell.textLabel.text = [self.arrayGrainBinTypes objectAtIndex: [indexPath row]];
    return cell;
}

Answer 1

In every delegate method (callback) the caller (tableview) is passed as a parameter. So you can switch based on this parameter like:

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
   if (tableView == self.tableViewGrainBinType) return [self.arrayGrainBinTypes count];
   else return [self.arrayGrainTypes count];
}

You get the idea…