how to get information of an object instance from ID number - objective-c

Question

I have a program that has 2 tables on two different windows. One table holds the customer name and id number and the other one hold the item name and number. They are both stored in a array and also in a .plist file.
What i would like to do is that on a third page there is going to be a sales page where the user will enter the customer id and item id and the program should be able to find the name and display it to a label. I don't know where to start and go. Could somebody please help or show me how to do i? I can upload any code that anybody wants to see but as I dont know where to start I dont know what to upload.
this is the customer.h file
#import <Foundation/Foundation.h>
NSString *name;
int memberNumber;
#interface Customer : NSObject <NSCoding>
{
NSString *name;
int memberNumber;
}
#property (nonatomic, copy) NSString *name;
#property int memberNumber;
#end
this is the customer.m
#import "Customer.h"
#implementation Customer
#synthesize name;
#synthesize memberNumber;
-(id) init
{
self = [super init];
if(self)
{
name = #"Test";
int i = arc4random()%1000000000000000000;
if (i<0)
{
memberNumber = i*-1;
}
else
memberNumber = i;
}
return self;
}
- (id)initWithCoder:(NSCoder *)decoder
{
if (self = [super init])
{
self.name = [decoder decodeObjectForKey:#"name"];
self.memberNumber = [decoder decodeIntForKey:#"memberNumber"];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)encoder
{
[encoder encodeObject:name forKey:#"name"];
[encoder encodeInt:memberNumber forKey:#"memberNumber"];
}
-(void)dealloc
{
[name release];
[super dealloc];
}
#end
this is the tableView.h file
#import <Foundation/Foundation.h>
#include <stdlib.h>
NSString *filepath;
#interface tableViewData : NSObject <NSTableViewDataSource>
{
#private
IBOutlet NSTableView *tableView;
NSMutableArray *list;
NSString *filepath;
}
-(IBAction)add:(id)sender;
-(IBAction)remove:(id)sender;
#end
this is the tableView.m file
#import "tableViewData.h"
#import "Customer.h"
#implementation tableViewData
-(void)awakeFromNib{
filepath = #"/Users/Desktop/CustomerNames.plist";
if ([[NSFileManager defaultManager]fileExistsAtPath:filepath])
{
NSMutableArray *archive = [NSKeyedUnarchiver unarchiveObjectWithFile:filepath];
list = archive;
}
else
list=[[NSMutableArray alloc]init];
}
-(NSInteger)numberOfRowsInTableView:(NSTableView *)tableView
{
return [list count];
}
-(id)tableView:(NSTableView *)tableView objectValueForTableColumn:(NSTableColumn *)tableColumn row:(NSInteger)row
{
Customer *Customer = [list objectAtIndex:row];
NSString *identifier = [tableColumn identifier];
return [Customer valueForKey:identifier];
}
-(void)tableView:(NSTableView *)tableView setObjectValue:(id)object forTableColumn: (NSTableColumn *)tableColumn row:(NSInteger)row
{
Customer *Customer = [list objectAtIndex:row];
NSString *identifier = [tableColumn identifier];
[Customer setValue:object forKey:identifier];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:list];
[data writeToFile:filepath options:NSDataWritingAtomic error:nil];
}
-(IBAction)add:(id)sender
{
[list addObject:[[Customer alloc]init]];
[tableView reloadData];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:list];
[data writeToFile:filepath options:NSDataWritingAtomic error:nil];
for (id name in list)
NSLog(#"obj: %#", name);
NSLog (#"array:%#",list);
}
-(IBAction)remove:(id)sender
{
NSInteger row = [tableView selectedRow];
if (row != -1)
{
[list removeObjectAtIndex:row];
}
[tableView reloadData];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:list];
[data writeToFile:filepath options:NSDataWritingAtomic error:nil];
}
-(void)dealloc
{
[super dealloc];
}
#end
hope this helps
(xcode 4.2.1 for OS X)

Answer 1

For example:
if([myNumber isKindOfClass:[NSNumber class]])
{
//do something here
}
That check if object myNumber is a NSNumber class Object. You can use whatever class you want of course. Read the documentation

Answer 2

If items you loaded to table are at the same order in your table you can use
[myArray objectAtIndex:[indexPath row]];
Then use can use the variables of the array that you needed.

Answer 3

First in that code:
-(void)tableView:(NSTableView *)tableView setObjectValue:(id)object forTableColumn: (NSTableColumn *)tableColumn row:(NSInteger)row
{
Customer *Customer = [list objectAtIndex:row];
NSString *identifier = [tableColumn identifier];
[Customer setValue:object forKey:identifier];
NSData *data = [NSKeyedArchiver archivedDataWithRootObject:list];
[data writeToFile:filepath options:NSDataWritingAtomic error:nil];
}
change Customer *Customer to Customer *customer ALWAYS use that way.
Then use that method to understand which row is selected.In your case which customer is selected. I understand from your code that every row has a costumer and those customers are in your list array.
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
//with this code you can get the selected customer from your list,
Customer *customer=[list objectAtIndex:[indexPath row]];
}
Then you can reach the values of the customer.