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POwhat is the best way to add and delete columns in a TableViewController?
 

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  1. POwhat is the best way to add and delete columns in a TableViewController?
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    <p>Good afternoon, I have a problem and hope you can advise me. First of all I apologize if something like this has already been asked, I think not, but still, forgive rookie mistakes</p> <p>The project I'm doing is a TabBarViewController with two controllers. One that basically is able to capture a bar code and make a call to a Web service with the bar code to get me the item from the server. That item then want to show on the other controller.</p> <p>My problem is i don't know how to pass the retrieved item to my custom UITableViewController, or which is the best way to achieve this.</p> <p>This is the interface able to capture a bar code and connect to a web service</p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import "MBProgressHUD.h" #import "ListaItemsViewController.h" @interface ViewController : UIViewController &lt; ZBarReaderDelegate,NSXMLParserDelegate &gt; { IBOutlet UILabel * resultText; ListaItemsViewController * listaItemsViewController; MBProgressHUD * HUD; NSMutableData * xmlData; //neccesary to parse the possible error NSMutableString * faultString; BOOL esperandoFaultString; //neccesary to parse message from logIn and logOut methods webservice BOOL esperandoReturn; NSMutableString * returnString; //neccesary to parse and save an item BOOL esperandoItem; BOOL esperandoDescripcionItem; BOOL esperandoPrecioItem; BOOL esperandoNumTotalItem; NSMutableString * descripcionItem; NSMutableString * precioItem; NSMutableString * numeroTotalItem; NSXMLParser * parser; } @property (nonatomic,strong) MBProgressHUD * HUD; @property (nonatomic, retain) IBOutlet UILabel * resultText; @property(nonatomic,strong) NSMutableData * xmlData; @property(nonatomic,strong) NSMutableString * faultString; @property(nonatomic,strong) NSMutableString * returnString; @property(nonatomic,strong) NSMutableString * descripcionItem; @property(nonatomic,strong) NSMutableString * precioItem; @property(nonatomic,strong) NSMutableString * numeroTotalItem; @property(nonatomic,strong) NSXMLParser * parser; @property(nonatomic,strong) ListaItemsViewController * listaItemsViewController; - (IBAction) scanButtonTapped; - (IBAction)esconderTeclado:(id)sender; - (IBAction)mostrarTeclado:(id)sender; @end </code></pre> <p>and this is the interface </p> <pre><code> #import &lt;UIKit/UIKit.h&gt; @interface ListaItemsViewController : UITableViewController { // the item list NSMutableArray * listaItems; } @property(nonatomic,strong) NSMutableArray * listaItems; @end </code></pre> <p>this is the implementation file:</p> <pre><code> #import "ListaItemsViewController.h" #import "CaracteristicasItemViewController.h" @implementation ListaItemsViewController @synthesize listaItems; - (id)initWithStyle:(UITableViewStyle)style { NSLog(@"ListaItemsViewController. initWithStyle..."); self = [super initWithStyle:style]; if (self) { // Custom initialization } return self; } - (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. } #pragma mark - View lifecycle - (void)viewDidLoad { NSLog(@"ListaItemsViewController. viewDidLoad..."); **//how do i create this item list with the items passed via web service?** listaItems = [[NSMutableArray alloc] initWithObjects:@"item1",@"item2",@"item3", nil]; [super viewDidLoad]; self.navigationItem.rightBarButtonItem = self.editButtonItem; } - (void)viewDidUnload { [super viewDidUnload]; } - (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated]; } - (void)viewDidAppear:(BOOL)animated { [super viewDidAppear:animated]; } - (void)viewWillDisappear:(BOOL)animated { [super viewWillDisappear:animated]; } - (void)viewDidDisappear:(BOOL)animated { [super viewDidDisappear:animated]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { // Return YES for supported orientations return (interfaceOrientation == UIInterfaceOrientationPortrait); } #pragma mark - Table view data source - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { // Return the number of rows in the section. NSLog(@"[listaItems count]: %d",[listaItems count]); return [listaItems count]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"celda"; UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; } // Configure the cell... cell.textLabel.text = [listaItems objectAtIndex:[indexPath row]]; cell.detailTextLabel.text = [listaItems objectAtIndex:[indexPath row]]; NSLog(@"cell: %@",cell.textLabel.text); return cell; } // Override to support conditional editing of the table view. - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the specified item to be editable. return YES; } // Override to support editing the table view. - (void)tableView:(UITableView *)tableView commitEditingStyle: (UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { **when i try to delete some row, the app crash, check!!** NSLog(@"commitEditingStyle..."); [tableView beginUpdates]; if (editingStyle == UITableViewCellEditingStyleDelete) { // Delete the row from the data source [tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; //[listaItems delete:[NSArray arrayWithObject:indexPath]]; } [tableView endUpdates]; NSLog(@"end commitEditingStyle..."); } #pragma mark - Table view delegate - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // Navigation logic may go here. Create and push another view controller. NSLog(@"didSelectRowAtIndexPath indexPath.row: %d",indexPath.row); CaracteristicasItemViewController *caracteristicas = [[CaracteristicasItemViewController alloc] initWithNibName:@"CaracteristicasItemViewController" bundle:Nil]; [self.navigationController pushViewController:caracteristicas animated:YES]; } @end </code></pre> <p>Whats the best way to achieve this, the best practice?</p> <p>Again, sorry if this is too easy for you guys, but I just started with this technology. Regards</p>
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    1. COThe title of the question and your actual question are not the same? Which is correct?
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      1. POwhat is the best way to add and delete columns in a TableViewController?
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    2. COThx for the response and my apologies for the inconvenience.My problem is i don't know how to pass the retrieved item to my custom UITableViewController, or which is the best way to achieve this. The ítem is retrieved using first controller and i d like to add the ítem on the Custom tableview.
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    3. COI put down what I thought was your question. But now I am not sure if you are passing one item at a time back or an array of items?
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