iOS: add new cell to tableview from another view - iphone

Question

I was wondering what is the best way to go about adding a new cell to a tableview in iOS. Let's say I have a firstviewcontroller and a secondviewcontroller. On the firstviewcontroller I have a tableview already populated with some data, I also have a navigation bar with an add button on the top. Tapping the add button will present a new view and then I want to pass data from that secondviewcontroller to firstviewcontroller and populate my tableview with it.
Thanks,
Sam

Answer 1

You secondViewController should create a delegate protocol. Your firstViewController should then be assigned as its delegate.
Once secondViewController saves the data it calls a method that your firstViewController should implement
A good exemple here:
How do I create delegates in Objective-C?
To get you started: secondViewController.h
#protocol secondViewControllerDelegate;
#interface secondViewController : UIViewController{
id<secondViewControllerDelegate> __unsafe_unretained delegate;
}
#property (nonatomic, unsafe_unretained) id<secondViewControllerDelegate> delegate;
#end
#protocol secondViewControllerDelegate <NSObject>
- (void)dataSaved;
#end

Answer 2

You can add a new class with tableView data source. initiate it with nesessary data (from both View controllers. use delegate to cooperate them) and after anu data chaging call [tableView setDataSource:]:
// DataSourceAtoZ.h
#import <Foundation/Foundation.h>
#import "MallsViewController.h"
#interface DataSourceCategory : NSObject <UITableViewDataSource> {
NSMutableArray *data;
UITableView *tableView;
}
#property (nonatomic, retain) NSMutableArray *data;
- (id)initWithData:(NSMutableArray *)d;
#end
then, anywhere in your code, compose data you wish to be in tableView and set dataSource:
NSMutableArray *dt = [[NSMutableArray alloc] init];
for (int i = 0; i < [categories count]; i++) {
NSMutableArray *names = [[NSMutableArray alloc] init];
[names addObject:[[categories objectAtIndex:i] objectAtIndex:0]];
for (int j = 1; j < [[categories objectAtIndex:i] count]; j++) {
NSRange match = [[[categories objectAtIndex:i] objectAtIndex:j] rangeOfString:[params objectAtIndex:0]];
if (match.length != 0) {
[names addObject:[[categories objectAtIndex:i] objectAtIndex:j]];
}
}
[dt addObject:names];
[names release];
}
dsCategory = [[DataSourceCategory alloc] init];
dsCategory = [dsCategory initWithData:dt];
[dt release];

Answer 3

You should create your arrays in the App delegate and then call them and change them however you want from there..
MyAppDelegate *appDelegate = (MyAppDelegate*)[[UIApplication sharedApplication] delegate];
once you have this line you can connect between two classes and call any methods on the delegate for example:
[appDelegate populateMyArray];
you don't add "new cells" like you described it, you use the same cells and populate them with different data.