Crashing On TableView insertRowsAtIndexPath - ios

Question

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.
The line of code and error it's crashing on are;
[self.tableView insertRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
2012-07-22 07:17:44.772 speecher[1897:707] * 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'
The full code for that class, (the main MasterViewController class) is as follows.
//
// 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
EDIT:
Amended to add [object addNewContent] method & class as per comments,
//
// 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

Answer 1

The problem is the NSMutableArrays hadn't been alloc and init. Had to add a check to see if they had a init and alloc if not. New check looks like this,
-(void) addNewContent:(NSString*)sTitle : (NSString*)sContent :(NSString*)sTimer
{
if(!titles)
{
titles = [[NSMutableArray alloc] init];
}
if(!content)
{
content = [[NSMutableArray alloc] init];
}
if(!timer)
{
timer = [[NSMutableArray alloc] init];
}
[titles insertObject:sTitle atIndex:0];
[content insertObject:sContent atIndex:0];
[timer insertObject:sTimer atIndex:0];
}