Add text from UITextField to NSMutableArray and display it in UITableView - objective-c

Question

I am just starting with Objective-C to write iPhone apps. I read a couple books and made some projects with the books, but I am just not an expert yet. I am trying to add some text from a UITextField to an NSMutableArray and then display it in a UITableView. I know this is really basic stuff for most of you, but I am just a beginner. So far I have two files:
TableViewController.h:
#import <UIKit/UIKit.h>
#class AddItemViewController;
#interface TableViewController : UITableViewController {
AddItemViewController *addItemViewController;
NSMutableArray *itemsArray;
}
-(IBAction)addNewItem:(id)sender;
#property (nonatomic, retain)NSMutableArray *itemsArray;
#end
TableViewController.m
#import "TableViewController.h"
#import "AddItemViewController.h"
#implementation TableViewController
#synthesize itemsArray;
-(id)init
{
[super initWithStyle:UITableViewStyleGrouped];
itemsArray = [[NSMutableArray alloc] init];
[self setTitle:#"Playing Around"];
UIBarButtonItem *bbi = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:#selector(addNewItem:)];
[[self navigationItem] setLeftBarButtonItem:bbi];
[bbi release];
return self;
}
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[[self tableView] reloadData];
}
#pragma mark Actions
-(IBAction)addNewItem:(id)sender
{
addItemViewController = [[AddItemViewController alloc] init];
[UIView beginAnimations:#"animations" context:nil];
[[self navigationController] pushViewController:addItemViewController animated:NO];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:self.navigationController.view cache:NO];
[UIView setAnimationDuration:0.7];
[UIView commitAnimations];
}
#pragma mark TableView Things
-(NSInteger)tableView:(UITableView*)tableView numberOfRowsInSection:(NSInteger)section
{
return [itemsArray count];
}
-(UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
static NSString *CellIdentifier = #"ItemCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
[cell autorelease];
}
cell.textLabel.text = [itemsArray objectAtIndex:indexPath.row];
[cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator];
return cell;
}
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)dealloc {
[itemsArray release];
[super dealloc];
}
#end
AddItemViewController.h
#import <UIKit/UIKit.h>
#class TableViewController;
#interface AddItemViewController : UIViewController {
TableViewController *tableViewController;
IBOutlet UITextField *textField;
NSString *value;
}
-(IBAction)cancel:(id)sender;
-(IBAction)create:(id)sender;
#property (nonatomic, copy) NSString *value;
#property (nonatomic, retain)NSMutableArray *itemsArray;
#end
AddItemViewController.m
#import "AddItemViewController.h"
#import "TableViewController.h"
#implementation AddItemViewController
#synthesize value, itemsArray;
-(id)init
{
[self setTitle:#"Add Item"];
UIBarButtonItem *item;
item = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemCancel target:self action:#selector(cancel:)];
[[self navigationItem] setLeftBarButtonItem:item];
[item release];
item = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:#selector(create:)];
[[self navigationItem] setRightBarButtonItem:item];
[item release];
return self;
}
-(void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[textField becomeFirstResponder];
}
-(void)viewDidUnload:(BOOL)animated
{
[super viewDidUnload];
[textField release];
textField = nil;
}
#pragma mark Actions
-(IBAction)cancel:(id)sender
{
tableViewController = [[TableViewController alloc] init];
[UIView beginAnimations:#"animations" context:nil];
[[self navigationController] pushViewController:tableViewController animated:NO];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.navigationController.view cache:NO];
[UIView setAnimationDuration:0.7];
[UIView commitAnimations];
}
-(IBAction)create:(id)sender
{
//This is where I get lost
NSString *string = [textField text];
NSLog(#"The string is: %#", string);
[itemsArray addObject:string];
[[tableViewController tableView] reloadData];
NSLog(#"The items are: %#", itemsArray);
tableViewController = [[TableViewController alloc] init];
[UIView beginAnimations:#"animations" context:nil];
[[self navigationController] pushViewController:tableViewController animated:NO];
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromLeft forView:self.navigationController.view cache:NO];
[UIView setAnimationDuration:0.7];
[UIView commitAnimations];
}
- (void)dealloc {
[textField release];
[value release];
[super dealloc];
}
#end
(Sorry I put the whole thing here, but for all I know I could be doing something wrong in any part of this.)
So if you want to skip most of the stuff I think I did right just go to the create: method.
Now what do I do? I got this far, but the text from the UITableView will not show up when I try to add it to the itemsArray. Any tips would be great! Thanks in advance.

Answer 1

Your UITableView needs a data source. Your table view controller should implement the UITableViewDataSource protocol. Here are the docs.