Accessing NSMutableArray Objects For Using On TableView

Question

I started develop an app which is using WCF service with JSON data. I got the data from WCF service but I didn't use it as I want.

here is the JSON data:

{"MenuDoldurAndroidResult":[
{"menu_description":"Turkish Pizza","menu_title":"L Pizza","menu_price":"26 TL"},{"menu_description":"Italiano Pizza","menu_title":"L Pizza","menu_price":"27 TL"},{"menu_description":"Extravaganza","menu_title":"L Pizza","menu_price":"29 TL"},{"menu_description":"Pepporoni Pizza","menu_title":"L Pizza","menu_price":"28 TL"},{"menu_description":"Turkish Pizza","menu_title":"S Pizza","menu_price":"12 TL"},{"menu_description":"Italiano Pizza","menu_title":"S Pizza","menu_price":"13 TL"},{"menu_description":"Extravaganza","menu_title":"S Pizza","menu_price":"15 TL"},{"menu_description":"Pepporoni Pizza","menu_title":"S Pizza","menu_price":"14 TL"}
]}

What I want:

If there are 2 title here, there must be 2 section in table view. Every item must be in their section.

Like this:

-L Pizzas

Turkish Pizza 26 TL
Italiano Pizza 27 TL
Extravaganza Pizza 29 TL
Pepperoni Pizza 28 TL

-S Pizzas

Turkish Pizza 12 TL
Italiano Pizza 13 TL
Extravaganza Pizza 15 TL
Pepperoni Pizza 14 TL

How can I access this item and display like this ?

- (void)viewDidLoad
{
    [super viewDidLoad];

//I posted request to service here. I didn't write these parts of code.

NSDictionary* json = [NSJSONSerialization
                              JSONObjectWithData:data
                              options:NSJSONReadingMutableContainers
                              error:&error];

        NSMutableArray *array= [json objectForKey:@"MenuDoldurAndroidResult"];

        menu = [[NSMutableArray alloc] initWithCapacity:3];

        NSString *descriptionTemp;
        NSString *titleTemp;
        NSString *priceTemp;
        for(int i=0; i< array.count; i++)
        {
            NSDictionary *menuList= [array objectAtIndex:i];
            titleTemp = [menuList objectForKey:@"menu_title"];
            descriptionTemp = [menuList objectForKey:@"menu_description"];
            priceTemp = [menuList objectForKey:@"menu_price"];
            [menu addObject:[NSArray arrayWithObjects:titleTemp,descriptionTemp,priceTemp,nil]];

        }
}

-(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    return 2;
}

-(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 2;
}

-(NSString *)tableView:(UITableView*)tableView titleForHeaderInSection:(NSInteger)section{

    if (section==0) {
        return @"L Pizzas";
    }
    else{
        return @"S Pizzas";
    }
}

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:nil];
    cell.textLabel.text = [menu objectAtIndex: indexPath.row];
    return cell;
}

Anupdas · Accepted Answer · 2013-03-26 10:11:03Z

4

If your content is static you can try using the answer by Sunny. But if is dynamic it's better to store the data in a different way. Obviously L pizza and S pizza seems to be a category and the rest are like category items.

You need to make a collection of the categories. Demo Project Source Code

- (void)viewDidLoad
{
    [super viewDidLoad];

//I posted request to service here. I didn't write these parts of code.

NSDictionary* json = [NSJSONSerialization
                              JSONObjectWithData:data
                              options:NSJSONReadingMutableContainers
                              error:&error];

NSMutableArray *allPizzas = [json[@"MenuDoldurAndroidResult"] mutableCopy];

NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"menu_price"
                                                                 ascending:YES
                                                                  selector:@selector(compare:)];
[allPizzas sortUsingDescriptors:@[sortDescriptor]];

NSMutableArray *pizzaCategories = [@[]mutableCopy];
//Find unique categories in all the pizzas
NSSet* categories = [NSSet setWithArray: [allPizzas valueForKey:@"menu_title"]];

//Enumerate to form a new reformatted category array
for (NSString *categoryTitle in categories)
{
    //Predicate is used to find the items that come under current category
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"menu_title == %@",categoryTitle];
    NSArray *categoryItems = [allPizzas filteredArrayUsingPredicate:predicate];
    //New dictionary with name of category and category items are formed 
    NSDictionary *categoryDict = @{@"menu_title":categoryTitle,@"pizzas":categoryItems};
    [pizzaCategories addObject:categoryDict];

}

//Assign the new formatted category array to the instance variable for holding categories.
self.categories = pizzaCategories;
}

Modify the datasource of tableView for the new structure

#pragma mark - UITableViewDataSource

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
   //The count of categories will give number of sections
    NSUInteger sections = [self.categories count];
    return sections;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    //The number of items in a category is calculated
    NSDictionary *category = self.categories[section];
    return [category[@"pizzas"] count];
}

- (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    //Title for the category
    NSDictionary *category = self.categories[section];
    return category[@"menu_title"];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *cellIdentifier = @"CellIdentifier";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    if (!cell) {
        cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:cellIdentifier];
    }

    NSDictionary *category      = self.categories[indexPath.section];
    NSArray *categoryItems      = category[@"pizzas"];
    NSDictionary *categoryItem  = categoryItems[indexPath.row];

    cell.textLabel.text = categoryItem[@"menu_description"];
    cell.detailTextLabel.text = categoryItem[@"menu_price"];

    return cell;
}

edited Mar 26, 2013 at 10:11

answered Mar 22, 2013 at 15:06

Anupdas

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7 Comments

Melih Mucuk Over a year ago

It seems like It will work. I will try, thanks for attention.

Melih Mucuk Over a year ago

in the NSDictionary *category = self.categories[section]; line, problems occured. Error message: Expected method to read array element not found on object of type 'NSSet *' There are 3 error about it.

Anupdas Over a year ago

@MelihMucuk I have verified above code and it is working fine. Can you provide the NSLog of self.categories?

Anupdas Over a year ago

@MelihMucuk I have included source code with my original answer I created a json file with values that you provided and then reformatted the json to display in the tableView.

Melih Mucuk Over a year ago

I will try on Tuesday and report the result. Thanks for your effort.

|

Matt · Accepted Answer · 2013-03-23 22:10:53Z

0

You can also use the free Sensible TableView framework to fetch the data from the web service and automatically display it in your table view.

answered Mar 23, 2013 at 22:10

Matt

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