Question

I have the following code in the main header file

NSMutableArray *array;
NSDictionary *dict,*dict1;

.m file contains array of dictionaries which display the item name along with their resp prices, I have displayed this in UITableView

 - (NSInteger)tableView:(UITableView *)table numberOfRowsInSection:(NSInteger)section
   {
      return [array count];
   }

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

      UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
      if (cell == nil) 
        {
           cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
        }
      cell.textLabel.text=[NSString stringWithFormat:@"%@ %@",[[array objectAtIndex:indexPath.row]objectForKey:@"name"],[[array objectAtIndex:indexPath.row]objectForKey:@"price"]];
                    return cell;        
   }

when the user selects any one item it sends the dictionary another dictionary called pass to VegQuantityViewController where quantity has to multiplied with the price

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    if(indexPath.row==0)
    {           
         VegQuantity *vegetarian1 = [[VegQuantity alloc] initWithNibName:@"VegQuantity" bundle:nil];    
        vegetarian1.pass=dict;
        [self presentModalViewController:vegetarian1 animated:YES];
    }
    if(indexPath.row==1)
    {           
        VegQuantity *vegetarian1 = [[VegQuantity alloc] initWithNibName:@"VegQuantity" bundle:nil];
        vegetarian1.pass=dict1;
        [self presentModalViewController:vegetarian1 animated:YES];
     }
}

- (void)viewDidLoad 
{
    array=[NSMutableArray array];
    dict=[NSDictionary dictionaryWithObjectsAndKeys:@"20.00",@"price",@"tomato soup",@"name",nil];
    [array addObject:dict]; 
    dict1=[NSDictionary dictionaryWithObjectsAndKeys:@"10.00",@"price",@"Veg Manchow soup",@"name",nil];
    [array addObject:dict1];
    NSLog(@"The array of dictionaries contains%@",array);
    [super viewDidLoad];
}

VegQuantity.h

NSDictionary *pass;
IBOutlet UIButton *done;
IBOutlet UITextField *input,*output;
NSNumber *prices;
float x,y,c;

VegQuantity.m

The done button just retrieves the key for that particular dish and multiplies it with the quantity user inputs in the textfield and displays it in the output textfield
I am facing NSInvalidArgumentException on pass objectForKey line, what can be the problem?

-(IBAction)done:(id)sender
{   
    prices=[pass objectForKey:@"price"];
    x=[input.text floatValue];
    y=[prices floatValue];
    c=x*y;
    output.text=[NSString stringWithFormat:@"%f",c];
}

Answer 1

Change below code in viewDidLoad method.

array=[[NSMutableArray alloc]init];
dict=[[NSDictionary alloc] initWithObjectsAndKeys:@"20.00",@"price",@"tomato soup",@"name",nil];
[array addObject:dict]; 
dict1=[[NSDictionary alloc]initWithObjectsAndKeys:@"10.00",@"price",@"Veg Manchow soup",@"name",nil];
[array addObject:dict1];