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POCrashing On TableView insertRowsAtIndexPath
 

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    <p>My app was running fine, I've not modified it to have a dedicated data controller class rather than the data being handled in the main UI class as it was during initial testing. However since the change it keeps crashing when adding a new item to the tableview. </p> <p>The line of code and error it's crashing on are; </p> <pre><code>[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; </code></pre> <blockquote> <p>2012-07-22 07:17:44.772 speecher[1897:707] <em>*</em> Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to insert row 0 into section 0, but there are only 0 rows in section 0 after the update'</p> </blockquote> <p>The full code for that class, (the main MasterViewController class) is as follows.</p> <pre><code>// // SpeecherMasterViewController.m // speecher // // #import "SpeecherMasterViewController.h" #import "SpeecherDataController.h" #import "SpeecherDetailViewController.h" @interface SpeecherMasterViewController () { NSString *newTitle; NSMutableArray *_speeches; NSMutableArray *_content; SpeecherDataController *object; } @end @implementation SpeecherMasterViewController @synthesize detailViewController = _detailViewController; - (void)awakeFromNib { self.clearsSelectionOnViewWillAppear = NO; self.contentSizeForViewInPopover = CGSizeMake(320.0, 600.0); [super awakeFromNib]; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. self.navigationItem.leftBarButtonItem = self.editButtonItem; UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(insertNewObject:)]; self.navigationItem.rightBarButtonItem = addButton; self.detailViewController = (SpeecherDetailViewController *)[[self.splitViewController.viewControllers lastObject] topViewController]; object = [[SpeecherDataController alloc] init]; } - (void)viewDidUnload { [super viewDidUnload]; // Release any retained subviews of the main view. } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } #pragma mark - Table View - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView { return 1; } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return [object returnNoObjects]; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"]; cell.textLabel.text = [object returnTitle:indexPath.row]; return cell; } - (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath { // Return NO if you do not want the specified item to be editable. return YES; } - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath { if (editingStyle == UITableViewCellEditingStyleDelete) { [_speeches removeObjectAtIndex:indexPath.row]; [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; } */ - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSString *titleobj = [object returnTitle:indexPath.row]; NSString *contentobj = [object returnContent:indexPath.row]; self.detailViewController.detailItem = titleobj; self.detailViewController.detaitContent = contentobj; } - (void)insertNewObject:(id)sender { //Make sure clear before we start, also make sure initalized (double redundancy with clear statement at end) newTitle = @""; //New Title pop up UIAlert View UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"New Speech" message:@"Please enter a name for speech" delegate:self cancelButtonTitle:@"Create" otherButtonTitles:nil]; alert.alertViewStyle = UIAlertViewStylePlainTextInput; UITextField * alertTextField = [alert textFieldAtIndex:0]; alertTextField.keyboardType = UIKeyboardTypeDefault; alertTextField.placeholder = @"Enter a new title"; [alert show]; } - (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex { newTitle = [[alertView textFieldAtIndex:0] text]; [object addNewContent:newTitle :@"IT REALLY WORKS!" :@"Nothing"]; //create new speech title, add to array and add to tableview NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0]; [self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic]; //Clear newTitle for use next time newTitle = @""; } @end </code></pre> <p>EDIT:</p> <p>Amended to add <code>[object addNewContent]</code> method &amp; class as per comments,</p> <pre><code>// // SpeecherDataController.m // speecher // // #import "SpeecherDataController.h" @interface SpeecherDataController () { NSMutableArray *titles; NSMutableArray *content; NSMutableArray *timer; } @end @implementation SpeecherDataController -(void) addNewContent:(NSString*)sTitle : (NSString*)sContent :(NSString*)sTimer { [titles insertObject:sTitle atIndex:0]; [content insertObject:sContent atIndex:0]; [timer insertObject:sTimer atIndex:0]; } //Methods to return data -(NSString*) returnTitle:(NSUInteger)row { return [titles objectAtIndex:row]; } -(NSString*) returnContent:(NSUInteger)row { return [content objectAtIndex:row]; } -(NSString*) returnTimer:(NSUInteger)row { return [timer objectAtIndex:row]; } -(NSInteger) returnNoObjects { return titles.count; } @end </code></pre>
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    1. COI can't see any errors in the code you provided, however looking at the message you are getting, and at the 'tableView:numberOfRowsInSection:' method, I'd guess that your '[object returnNoObjects]' method is not returning the right number of rows (0 in this case).
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      1. USDavid Skrundz
    2. CO@NSArray You almost right. When looking into that I discovered the `[object addNewContent]` function isn't actually adding the content. Question amended to show that function too.
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    3. COTry printing out the values of your 'titles' array after you add an object. If its not allocated, you will want to do what JamesKraw has suggested.
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      1. USDavid Skrundz
 

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