iOS tableView help - iphone

I am trying to make a tableView that will allow me to delete and add items. The biggest problem I am running into is that none of my cells will display. I'm not sure what I'm leaving out. Here's the TableViewController class
#import "GroceryListTableViewController.h"
#implementation GroceryListTableViewController
#synthesize groceries;
/*- (NSMutableArray *) groceries
{
if(groceries == nil)
[self addToGroceries:#"Groceries"];
return groceries;
}*/
- (id)initWithStyle:(UITableViewStyle)style
{
self = [super initWithStyle:style];
self.groceries = [NSMutableArray arrayWithObjects:#"Steak", #"Juice", #"Stuff", nil];
if (self) {
}
return self;
}
-(void) addToGroceries:(NSString *)grocery
{
[self.groceries addObject:grocery];
}
- (void)dealloc
{
[groceries release];
[super dealloc];
}
- (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
{
[super viewDidLoad];
// Uncomment the following line to preserve selection between presentations.
// self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (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)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of rows in the section.
return [self.groceries count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"GroceryListCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
cell.textLabel.text = [self.groceries objectAtIndex:indexPath.section];
// Configure the cell...
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
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:#"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
*/
}
#end
Thanks for any help. I think the problem is where I fill the list with items, but I have tried other things (such as a constructor), but they haven't worked either.
(I have edited to code to be the correct solution so the other questions were able to help)

Try this...although the rest of the code could use some review. ;)
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// Return the number of sections.
return 1;
}

Related

PFquery table view control show detail

I'm looking for a way to transport data entered into the database from a view to another. I have a table view controller with university exams inserted every examination must show your card, calling its data from the data browser to Parse the current user through the
- (void) prepareForSegue: (uistoryboardSegue)
Then I try to explain as best as possible ...
I downloaded from the project parse.com PFQueryTableViewController.
I entered all the data perfectly recall the Databrowser ...
My cells are thus created:
#import "TableViewParse.h"
#import "CustomNav.h"
#import "ListaInAttesa.h"
#implementation TableViewParse
#synthesize TableViewInAttesa;
- (id)initWithCoder:(NSCoder *)aCoder {
self = [super initWithCoder:aCoder];
// Custom the table
// The className to query on
self.parseClassName = #"miaclasse";
// The key of the PFObject to display in the label of the default cell style
self.textKey = #"titolomio";
// Whether the built-in pull-to-refresh is enabled
self.pullToRefreshEnabled = YES;
// Whether the built-in pagination is enabled
self.paginationEnabled = YES;
// The number of objects to show per page
self.objectsPerPage = 5;
[CustomNav NavBar];
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Uncomment the following line to preserve selection between presentations.
self.clearsSelectionOnViewWillAppear = NO;
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (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);
}
- (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 - Parse
- (void)objectsDidLoad:(NSError *)error {
[super objectsDidLoad:error];
// This method is called every time objects are loaded from Parse via the PFQuery
}
- (void)objectsWillLoad {
[super objectsWillLoad];
// This method is called before a PFQuery is fired to get more objects
}
// Override to customize what kind of query to perform on the class. The default is to query for
// all objects ordered by createdAt descending.
- (PFQuery *)queryForTable {
PFQuery *query = [PFQuery queryWithClassName:self.parseClassName];
[query whereKey: #"user" equalTo: [PFUser currentUser]];
// If no objects are loaded in memory, we look to the cache first to fill the table
// and then subsequently do a query against the network.
if ([self.objects count] == 0) {
query.cachePolicy = kPFCachePolicyCacheThenNetwork;
}
[query orderByAscending:#"createdAt"];
return query;
}
// Override to customize the look of a cell representing an object. The default is to display
// a UITableViewCellStyleDefault style cell with the label being the first key in the object.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
// Configure the cell
cell.textLabel.text = [object objectForKey:#"titolomio"];
cell.detailTextLabel.text = [NSString stringWithFormat:#"Questo esame รจ previsto per il : %#", [object objectForKey:#"datamia"]];
return cell;
}
/*
// Override if you need to change the ordering of objects in the table.
- (PFObject *)objectAtIndex:(NSIndexPath *)indexPath {
return [objects objectAtIndex:indexPath.row];
}
*/
// Override to customize the look of the cell that allows the user to load the next page of objects.
// The default implementation is a UITableViewCellStyleDefault cell with simple labels.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForNextPageAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"NextPage";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.textLabel.text = #"Visualizza ancora ....";
return cell;
}
#pragma mark - Table view data source
// 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 {
if (editingStyle == UITableViewCellEditingStyleDelete) {
PFObject *object = [self.objects objectAtIndex:indexPath.row];
[object deleteInBackgroundWithBlock:^(BOOL succeeded, NSError *error) {
[self loadObjects];
}];
}
}
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"Esamiinattesa"])
{
// NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
// ListaInAttesa *destViewController = segue.destinationViewController;
// destViewController.title = [self.postController objectInListAtIndex:indexPath.row];
}
}
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[super tableView:tableView didSelectRowAtIndexPath:indexPath];
// [self performSegueWithIdentifier:#"Esamiinattesa" sender:indexPath];
}
#end
Now I need that when the user clicks on a current exam placed in the cell Tableview is sent to a specific viewcontroller where inside are called the results of the examination the time the user selected current ...
I know that it is "prepareForSegue" but I can not figure out where I'm wrong, maybe I'm wrong just the procedure to obtain the required result.
P.S.I realized just now that I connected with the user's findanzato because I changed my pc and I kept doing the same id logout ... Sorry ... We are working on this project in two App

Buttons in iOS App won't show

I am creating an iPhone app, and I'm having some trouble with the TableView and adding buttons. I started with a regular view, and then added a table view, and then a couple buttons to the top, as shown here:
The problem is that when I run the app I get this:
Neither of the buttons that I added are there. Here is my .h file:
//
// RootBeerTVCViewController.h
// BaseApp
//
// Created by Blaine Anderson on 10/12/12.
// Copyright (c) 2012 UIEvolution, Inc. All rights reserved.
//
#import <UIKit/UIKit.h>
#interface RootBeerTVCViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>
#property (weak, nonatomic) IBOutlet UIButton *nameButton;
#property (weak, nonatomic) IBOutlet UIButton *locationButton;
#property(strong, nonatomic) NSMutableArray* rootList;
-(IBAction)sort:(id)sender;
#end
And here is the .M file:
//
// RootBeerTVCViewController.m
// BaseApp
//
// Created by Blaine Anderson on 10/12/12.
// Copyright (c) 2012 UIEvolution, Inc. All rights reserved.
//
#import "RootBeerTVCViewController.h"
#import "GlobalData.h"
#interface RootBeerTVCViewController ()
#end
#implementation RootBeerTVCViewController
#synthesize rootList;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void)viewDidLoad
{
[super viewDidLoad];
[GlobalData sharedData].mViewManager.mNavController.navigationBarHidden=NO;
// Do any additional setup after loading the view from its nib.
rootList = [[GlobalData sharedData] mRootList ];
NSLog(#"RootList in view did load: %#", rootList);
UITableView *tableView = [[UITableView alloc] initWithFrame:[[UIScreen mainScreen] applicationFrame] style:UITableViewStylePlain];
tableView.autoresizingMask = UIViewAutoresizingFlexibleHeight|UIViewAutoresizingFlexibleWidth;
tableView.delegate = self;
tableView.dataSource = self;
//[tableView addSubview:sortingView];
[tableView reloadData];
self.view = tableView;
}
- (void)viewDidUnload
{
[self setLocationButton:nil];
[self setNameButton:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
rootList = [[GlobalData sharedData] mRootList ];
NSLog(#"RootList: %#", rootList);
// Return the number of sections.
NSLog(#"RootList count: %i", rootList.count);
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
// Return the number of sections.
NSLog(#"RootList row count: %i", rootList.count);
return rootList.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
rootList =[[GlobalData sharedData].mRootBeerParser rootBeerList];
NSLog(#"RootList Cell: %#", rootList);
RootBeers* mRootBeer = [rootList objectAtIndex:indexPath.row];
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"Cell"];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
}
NSLog(#"Cell Name: %#", mRootBeer.brewer);
// Configure the cell...
cell.textLabel.text = mRootBeer.name;
cell.detailTextLabel.text = mRootBeer.location;
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
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
RootBeers* mRootBeer =[rootList objectAtIndex:indexPath.row];
[GlobalData sharedData].mRootBeer = mRootBeer;
[[GlobalData sharedData].mViewManager pushView:DETAILVIEW animated:YES];
}
- (IBAction)sort:(id)sender {
rootList =[[GlobalData sharedData].mRootBeerParser rootBeerList];
[[GlobalData sharedData].mRootBeerParser sortRootBeerByName:rootList];
}
#end
If someone could give me an idea of what I'm doing wrong, that would be great. I hope that I have provided enough information, if not, please let me know and I'll be happy to supply more.
In your viewDidLoad you create a new UITableView of screen size and then set it as VC view, thus overriding the view that was loaded from xib. As a result you are only seeing the table you created in code.

Table reload data is not working

In my app five tab bars are using.in the 5th tab one table view is there.here im retrieving and array and displaying in table view.The contents of array are displaying correctly in NSLog.But only the first content in the array is displaying in cell.Can anyone help me how to solve this issue please..
Below is the code i used and can anyone give me a hand where im going wrong please..
Here is where im adding the contents
-(IBAction)Done
{
NSString *message = [df stringFromDate:itemDate];
NSLog(#"message1234 %#",message);
dates= [[NSMutableArray alloc] init];
NSUserDefaults *currentDefaults7 = [NSUserDefaults standardUserDefaults];
NSData *dataRepresentingSavedArray7 = [currentDefaults7 objectForKey:#"datingg"];
NSMutableArray *oldSavedArray7 = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingSavedArray7];
if(dates!=nil)
{
dates = [[NSMutableArray alloc] initWithArray:oldSavedArray7];
}
[dates addObject:message];
NSUserDefaults *currentDefaults3 = [NSUserDefaults standardUserDefaults];
[currentDefaults3 setObject:[NSKeyedArchiver archivedDataWithRootObject:dates] forKey:#"datingg"];
[currentDefaults3 synchronize];
NSLog(#"%#dates ate getting heree",dates);
Here is where im retreiving the contents(fifth tab)
- (void)viewWillAppear:(BOOL)animated
{
NSLog(#"ddddd");
NSUserDefaults *currentDefaults = [NSUserDefaults standardUserDefaults];
NSData *dataRepresentingSavedArray = [currentDefaults objectForKey:#"datingg"];
NSMutableArray *oldSavedArray = [NSKeyedUnarchiver unarchiveObjectWithData:dataRepresentingSavedArray];
datedisplay = [[NSMutableArray alloc] initWithArray:oldSavedArray];
NSLog(#"%#",datedisplay);
[self.tab reloadData];
[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
{
//#warning Potentially incomplete method implementation.
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//#warning Incomplete method implementation.
// Return the number of rows in the section.
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
if(i<[datedisplay count])
{
// Configure the cell...
cell.textLabel.text=[datedisplay objectAtIndex:i];
i++;
}
[self.tab reloadData];
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
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath
{
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath
{
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark - Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:#"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
*/
}
#end
In NSLog it is showing
Reminder[6448:207] (
"02 04-12",
"02 03-12",
"03 04-20"
)
![enter image description here][1]
Instead of this
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//#warning Incomplete method implementation.
// Return the number of rows in the section.
return 1;
}
use
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
//#warning Incomplete method implementation.
// Return the number of rows in the section.
return [datedisplay count];
}
You are telling your table it only has one row.
(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [datedisplay count];
}
Instead of what you have.

why am I getting error "[UIViewController tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0x4e38c50'"?

I made a TabBarApplication,
and made 3 controllers,
1 of them is inheriting UITableViewController , I am putting number of sections are
"return 1" and number of rows in section as "return 2",
I am getting the following problem, why?
[UIViewController tableView:numberOfRowsInSection:]: unrecognized selector sent to instance 0x4e38c50'"
#import <UIKit/UIKit.h>
#interface List : UITableViewController {
}
#end
and .m file is
#import "List.h"
#implementation List
#pragma mark -
#pragma mark View lifecycle
/*
- (void)viewDidLoad {
[super viewDidLoad];
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
*/
/*
- (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];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return 10;
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell...
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 {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source.
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:#"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
*/
}
#pragma mark -
#pragma mark Memory management
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload {
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
#end
Pls check the datasource of the tableView. I think its not properly set-up. If the dataSource is not setup properly it can cause issues
This happens when you set a table view delegate/datasource that does not implement the methods declared on the delegate/datasource protocol.
Without looking at the code I cant tell you exactly what you are doing wrong but if you create the controller using an xcode template just make usre you are initializing it as a UITableViewController and nota general UIVIewController.
If you post your code I can help you work out whats wrong, but as I said, this error happens when the tableview delegate does not implement the tableView:numberOfRowsInSection: method; if you say you are implementing this method then the tableview is not assigned linked to that controller class..
Well I do this mistake all the Time. Under Outlets, make sure you drag the outlet to the "ViewController" and not the "View". I normally use the "Document Outline" for connecting just to make sure. Hope this helps.
I got the same error. I solved it by changing my View Controller's Class from UIViewController to ViewController (your view controller class ViewController.h)

NSMutableArray doesn't get populated on view's first appearance

I'm using the Dropbox SDK to fill an array filePaths.
However the array is only filled the second time I open the corresponding view. When I open the view for the first time, the array is empty.
Does anyone know why this is?
Thanks in advance!
// DropboxFileViewController.m
#import "DropboxFileViewController.h"
#import "DropboxViewController.h"
#import "DropboxSDK.h"
#import <stdlib.h>
#interface DropboxFileViewController () <DBRestClientDelegate>
#property (nonatomic, readonly) DBRestClient* restClient;
#end
#implementation DropboxFileViewController
#synthesize dropboxFileView;
#synthesize filePaths;
- (void)restClient:(DBRestClient*)client loadedMetadata:(DBMetadata*)metadata {
//NSArray* validExtensions = [NSArray arrayWithObjects:#"pdf", #"docx", #"doc", nil];
NSMutableArray* newDropboxFilePaths = [NSMutableArray new];
for (DBMetadata* child in metadata.contents) {
//NSString* extension = [[child.path pathExtension] lowercaseString];
//if (!child.isDirectory && [validExtensions indexOfObject:extension] != NSNotFound) {
[newDropboxFilePaths addObject:child.path];
//}
}
[filePaths release];
filePaths = newDropboxFilePaths;
}
/*- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil {
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization.
}
return self;
}*/
#pragma mark -
#pragma mark Initialization
/*
- (id)initWithStyle:(UITableViewStyle)style {
// Override initWithStyle: if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad.
self = [super initWithStyle:style];
if (self) {
// Custom initialization.
}
return self;
}
*/
#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad {
[super viewDidLoad];
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
[self.restClient loadMetadata:#"/"];
}
- (DBRestClient*)restClient {
if (restClient == nil) {
restClient = [[DBRestClient alloc] initWithSession:[DBSession sharedSession]];
restClient.delegate = self;
}
return restClient;
}
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
[dropboxFileView reloadData];
}
/*
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
}
*/
/*
- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
#pragma mark -
#pragma mark Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
// Return the number of sections.
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return [filePaths count];
//NSLog(#"deze shit wordt geinvoked vriend");
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
}
// Configure the cell...
//NSDictionary *dictionary = [listOfItems objectAtIndex:indexPath.section];
NSUInteger row = [indexPath row];
cell.textLabel.text = [filePaths objectAtIndex:row];
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 {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source.
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark -
#pragma mark Table view delegate
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
// Navigation logic may go here. Create and push another view controller.
/*
<#DetailViewController#> *detailViewController = [[<#DetailViewController#> alloc] initWithNibName:#"<#Nib name#>" bundle:nil];
// ...
// Pass the selected object to the new view controller.
[self.navigationController pushViewController:detailViewController animated:YES];
[detailViewController release];
*/
}
#pragma mark -
#pragma mark Memory management
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc. that aren't in use.
}
- (void)viewDidUnload {
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
}
#end
your observation might be wrong.
I guess DBRestClient does its work in another thread. And shortly after you've left viewWillAppear the tableview gets its data. And at this time the DBRestClient isn't finished.
To fix this simply reload the tableview when you get the data
Append [dropboxFileView reloadData]; to - (void)restClient:(DBRestClient*)client loadedMetadata:(DBMetadata*)metadata