How to Connect Tableview and View Controller Using NSMutableDictionary?

Question

In my iphone design, there are two table views added.

One table view is for displaying the MenuList for hotels using NsDictionary(Like Veg. NonVeg, Beverages..) and the other table view is for displaying the ListItems(Like In veg, i will Have Paneer,Rotti..) . When ever a menuList cell is selected the files inside the selected list needs to to be displayed in the other table view(ListIems).

@interface TableViewController ()

@end

@implementation TableViewController
@synthesize menuDict ;


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

- (void)viewDidLoad
{
        [super viewDidLoad];

    menuName = [NSArray arrayWithObjects:@"Veg", @"NonVeg", @"Beverages", nil];
    menuId = [NSArray arrayWithObjects:@"1", @"2", @"3", nil];

    self.menuDict = [NSDictionary dictionaryWithObjects:menuName
                                                     forKeys:menuId];


}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

#pragma mark - Table view data source

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    // Return the number of sections.
    return 1;
}

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


-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{



    static NSString *unifiedID = @"TableCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:unifiedID];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:unifiedID];

    }

    for (id key in self.menuDict) {
        NSLog(@"key: %@, value: %@", key, [self.menuDict objectForKey:key]);
    }

    NSString *key = [self.menuDict allKeys][indexPath.row];

    NSString *menuNameString = self.menuDict[key];
    NSString *menuIdString = key;
    cell.textLabel.text  = menuNameString;
    cell.detailTextLabel.text  = menuIdString;

    return cell;

}

//updated did select row

 -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString *key = [self.menuDict allKeys][indexPath.row];
    NSDictionary *dictToPass = nil;
    if([key isEqualToString:@"1"] ){
        dictToPass = [[NSDictionary alloc]initWithObjectsAndKeys:@"1",@"Rotti" , @"2", @"Panner",  nil] ;
    }
    else{
        if([key isEqualToString:@"2"] ){
            dictToPass = [[NSDictionary alloc]initWithObjectsAndKeys:@"1",@"chicken" , @"2", @"mutton",  nil] ;
        }

    }

    DetailTableViewController *detailVC = [[DetailTableViewController alloc]init];
    detailVC.detailData = dictToPass;
    [self.navigationController pushViewController:detailVC animated:YES];



}







}

second table :

// Is this right to declare the lists here same as my first table. Please help me in this one.

@interface DetailTableViewController ()

@end

@implementation DetailTableViewController
@synthesize vegName,vegId ;



- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    vegName = [NSArray arrayWithObjects:@"Rotti", @"Panneer", @"Chappathi", nil];
    vegId = [NSArray arrayWithObjects:@"1", @"2", @"3", nil];

    self.vegDict = [NSDictionary dictionaryWithObjects:vegName
                                                forKeys:vegId];

    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return  1 ;
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [[self.vegDict allKeys]count] ;
    return 1 ;
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{

    static NSString *unifiedID = @"aCellID";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:unifiedID];
    if (!cell) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:unifiedID];

    }

    for (id key in self.vegDict) {
        NSLog(@"key: %@, value: %@", key, [self.vegDict objectForKey:key]);
    }

    NSString *key = [self.vegDict allKeys][indexPath.row];

    NSString *vegNameString = self.vegDict[key];
    NSString *vegIdString = key;
    cell.textLabel.text  = vegNameString;
    cell.detailTextLabel.text  = vegIdString;

    return cell;
}

Answer 1

I guess you want your vegDict property in DetailTableViewController to be filled based on user selection in first tableview.

Currently what you are doing is from prepareForSegue method (I dont know how this been called as you haven't mentioned about creating any seques in between your first and second controller), set the vegDict property some values and same values are again set on its viewDidLoad method. That is not required.

The thing you should do is to implement didSelectRowAtIndexPath, then get the tapped row's content's dictionary and then set the detailTableViewController.vegDict to that. Push the detailTableViewController from here.

UPDATE based on comments:

Your DetailTableViewController should have a property say detailData for holding the data that you wish to display in detailTableViewController. Now you need to assign this detailData based on the menu selection. For example in your case, if user selects veg, then you should do the following in didSelectRowAtIndexPath

NSString *key = [self.menuDict allKeys][indexPath.row];
NSDictionary *dictToPass = nil;
if([key isEqualToString:@"1"] ){
   dictToPass = [[NSDictionary alloc]initWithObjectsAndKeys:@"1",@"Rotti" , @"2", @"Panner",  nil] ;
}
else{
   //Create for non-veg
}

DetailTableViewController *detailVC = [[DetailTableViewController alloc]init];
detailVC.detailData = dictToPass;
[self.navigationController pushViewController:detailVC animated:YES];