NSUserDefaults UITableView - ios

Question

I am a novice programmer. Because i'm a newby at Stackoverflow I cannot comment someones anwser yet. I got a question about this post : How to use NSUserDefaults to save data from ViewController and retrieve it to TableViewController when app reruns
I try to solve the problem and I read many topics on Stackoverflow, but I couldn't find the solution. I have the same code as Rhenzzz and I implemented the solution explained by Jay.
I have an error in cellForRowAtIndexPath method at the line NSString *itemWish = itemDictionary[#"itemWish"];.
Error:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[WishListItem objectForKeyedSubscript:]: unrecognized selector sent to instance 0x9dc4d80'
My full method is :
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"wishlistCell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
NSDictionary *itemDictionary = self.wishlistItem[indexPath.row];
NSString *itemWish = itemDictionary[#"itemWish"];
cell.textLabel.text = itemWish;
return cell;
}
EDIT :
I forget to precise that my error occurs when I add a new item. The tableview displays datas when I launch the App. But when I add data on my ViewController and then save & go back to the Tableview by clicking on my Done button, I have the error describe above.
So I put some NSLog in cellForRowAtIndexPath : NSLog(#"Display the dictionary:%#",itemDictionary ); and NSLog(#"Display the item:%#",itemWish );. Everything is right.
So my problem comes certainly from the IBAction :
- (IBAction)unwindToList:(UIStoryboardSegue *)unwindSegue {
AddItemViewController *source = [unwindSegue sourceViewController];
WishlistItem *item = source.wishItem;
if (item != nil) {
[self.wishlistItem addObject:item];
[self.tableView reloadData];
}
}
If I delete the [self.tableView reloadData]; the error disappears but obviously my Tableview is not auto-updated.
Thanks for your help !

Answer 1

Given the error, it is clear that self.wishlistItem is an array of WishListItem objects and not an array of dictionaries. You should change these two lines:
NSDictionary *itemDictionary = self.wishlistItem[indexPath.row];
NSString *itemWish = itemDictionary[#"itemWish"];
to:
WishListItem *wishListItem = self.wishlistItem[indexPath.row];
NSString *itemWish = wishListItem.somePropertyGivingTheDesiredValue;
where obviously you need to use the appropriate property on wishListItem to get the value you want from it.