setEditing method causing SIGABRT - ios

Question

I'm working form the big nerd ranch book, iphone programming. I'm working through Chapt 11 where you implement your own setEditing method:
- (void)setEditing:(BOOL)editing animated:(BOOL)animated
{
[super setEditing:editing animated:animated];
if( editing) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[teams count] inSection:0];
NSArray *paths = [NSArray arrayWithObject:indexPath];
[[self tableView] insertRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationLeft];
}
else {
/*
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[teams count] inSection:0];
NSArray *paths = [NSArray arrayWithObject:indexPath];
[[self tableView] deleteRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationFade];
*/
}
}
When I run this the whole app does a Sigabort without any info other than that. The line that seems to cause the problem is this one:
[[self tableView] insertRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationLeft];
I'm not sure what I'm doing wrong. What else would be good to see?
This is the whole file:
//
// TeamsViewController.m
// TeamTrackerClient
//
// Created by Mark Steudel on 3/4/12.
// Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//
#import "TeamsViewController.h"
#import "Team.h"
#implementation TeamsViewController
-(id) init
{
self = [super initWithStyle:UITableViewStyleGrouped];
teams = [[NSMutableArray alloc] init];
Team *team = [[Team alloc] init];
team.teamName = [NSString stringWithFormat: #"Fighting Axons"];
team.teamCode = [NSString stringWithFormat: #"FA1"];
[teams addObject:team];
Team *team2 = [[Team alloc] init];
team2.teamName = [NSString stringWithFormat: #"Pipers Peddlers"];
team2.teamCode = [NSString stringWithFormat: #"PP1"];
[teams addObject:team2];
return self;
}
- (id) initWithStyle:(UITableViewStyle)style
{
return [self init];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
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
/*
// Implement loadView to create a view hierarchy programmatically, without using a nib.
- (void)loadView
{
}
*/
/*
// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
}
*/
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (UIView *) headerView
{
if( headerView)
return headerView;
UIButton *editButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[editButton setTitle: #"Edit" forState: UIControlStateNormal];
float w = [[UIScreen mainScreen] bounds].size.width;
CGRect editButtonFrame = CGRectMake(8.0, 8.0, w - 16.0, 30.0);
[editButton setFrame:editButtonFrame];
[editButton addTarget:self
action:#selector(editingButtonPressed:)
forControlEvents:UIControlEventTouchUpInside];
CGRect headerViewFrame = CGRectMake(0, 0, w, 48);
headerView = [[UIView alloc] initWithFrame:headerViewFrame];
[headerView addSubview:editButton];
return headerView;
}
- (void) editingButtonPressed: (id) sender
{
if( [self isEditing] ) {
[sender setTitle:#"Edit" forState:UIControlStateNormal];
[self setEditing:NO animated:YES];
}
else {
[sender setTitle: #"Done" forState:UIControlStateNormal];
[self setEditing:YES animated:YES];
}
}
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
return [self headerView];
}
- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return [[self headerView] frame].size.height;
}
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)sourceIndexPath toIndexPath:(NSIndexPath *)destinationIndexPath
{
Team *t = [teams objectAtIndex:[sourceIndexPath row]];
[teams removeObjectAtIndex:[sourceIndexPath row]];
[teams insertObject:t atIndex:[destinationIndexPath row]];
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if( editingStyle == UITableViewCellEditingStyleDelete ) {
[teams removeObjectAtIndex:[indexPath row]];
[tableView deleteRowsAtIndexPaths: [NSArray arrayWithObject:indexPath] withRowAnimation: UITableViewRowAnimationFade];
}
}
- (void)setEditing:(BOOL)editing animated:(BOOL)animated
{
[super setEditing:editing animated:animated];
if( editing) {
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[teams count] inSection:0];
NSArray *paths = [NSArray arrayWithObject:indexPath];
[[self tableView] insertRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationLeft];
}
else {
/*
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:[teams count] inSection:0];
NSArray *paths = [NSArray arrayWithObject:indexPath];
[[self tableView] deleteRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationFade];
*/
}
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
int numberOfRows = [teams count];
if( [self isEditing] )
numberOfRows++;
return numberOfRows;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"UITableViewCell"];
if( !cell ) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"UITableViewCell"];
}
if( [indexPath row] < [teams count] ) {
Team *t = [teams objectAtIndex:[indexPath row]];
[[cell textLabel] setText:[t teamName]];
}
else {
[[cell textLabel] setText: #"Add New Item ... "];
}
Team *t = [teams objectAtIndex:[indexPath row]];
[[cell textLabel] setText:[t teamName]];
return cell;
}
#end

Answer 1

[[self tableView] insertRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationLeft];
this make the table view reload data ..and check the data in its datasource methods..
i believe it is crashing on
Team *t = [teams objectAtIndex:[indexPath row]];
[[cell textLabel] setText:[t teamName]];
there might be no objects in the teams array on here for the new index paths...
check by breakpointing here..