Index out of bounds when passed through segue - ios

Question

I have 3 custom table cells in my UITableView. The first two cells have set positions followed by a random number of cells.
For my row count I use :
return [stepLabel count] +2;
And for my tablecells I use :
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *stepsCellIdentifier = #"StepsViewCell";
static NSString *descIdentfier = #"descViewCell";
static NSString *videoCellIdentfier = #"videoViewCell";
if( indexPath.row == 0 ) {
UITableViewCell *cell = nil;
cell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:videoCellIdentfier];
if( !cell ) {
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"videoViewCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
cell.textLabel.text = [descLabel objectAtIndex:indexPath.row];
return cell;
}
else if( indexPath.row == 1 ) {
stepDescCell *cell = nil;
cell = (stepDescCell *)[tableView dequeueReusableCellWithIdentifier:descIdentfier];
if( !cell ) {
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"descViewCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
cell.descTextLabel.text = [descLabel objectAtIndex:indexPath.row - 1];
return cell;
}
else {
StepViewCell *cell = nil;
cell = (StepViewCell *)[tableView dequeueReusableCellWithIdentifier:stepsCellIdentifier];
if( !cell ) {
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"StepsViewCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
cell.stepTextLbl.text = [stepLabel objectAtIndex:(indexPath.row - 2)];
NSString *imageThumb = [thumbImg objectAtIndex:(indexPath.row - 2)];
[cell.thumbImage setImage:[UIImage imageNamed: imageThumb] forState:UIControlStateNormal];
return cell;
}
}
All this works perfectly, however when I try to send a string from the table across a segue to another UIViewController I get the following error:
index (-2 (or possibly larger)) beyond bounds (3)'
The prepare for segue method:
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"imageBigShow"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
imageBigViewController *destViewController = segue.destinationViewController;
NSString *largeImgString = [largeImg objectAtIndex:(indexPath.row - 2)];
destViewController.imageBigString = largeImgString;
}
}
What am I doing wrong?
UPDATE
#implementation detailViewController
{
NSArray *thumbImg;
NSArray *stepLabel;
NSArray *descLabel;
NSArray *largeImg;
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Find out the path of recipes.plist
NSDictionary *mapping = #{
#"How to wear a Kilt" : #"wearAKilt",
#"How to tie a cravat" : #"wearACravat",
#"How to wear a sporran" : #"wearASporran",
#"How to tie Ghillie Brogues" : #"wearTheShoes",
#"How to wear the accessories" : #"wearAccessories",
#"How to tie a cravat" : #"wearACravat",
#"How to Measure the Neck" : #"htmNeck",
#"How to Measure the chest" : #"htmChest",
#"How to Measure the waist" : #"htmWaist",
};
NSString *name = [mapping objectForKey:self.title];
NSString *path = [[NSBundle mainBundle] pathForResource:name ofType:#"plist"];
// Load the file content and read the data into arrays
NSDictionary *dict = [[NSDictionary alloc] initWithContentsOfFile:path];
thumbImg = [dict objectForKey:#"thumbImg"];
stepLabel = [dict objectForKey:#"stepLabel"];
descLabel = [dict objectForKey:#"descLabel"];
largeImg = [dict objectForKey:#"largeImg"];
}

Answer 1

You have the following line:
NSString *largeImgString = [largeImg objectAtIndex:(indexPath.row - 2)];
If the user taps on the 1st or 2nd rows (index paths with row 0 or 1), this code will fail.