Updating NSMutableArray from sectioned tableview after item is deleted - objective-c

Question

I have a tableview which is sectioned alphabetically. I have an NSMutableArray *drinks which is my original datasource which its being populated with NSMutableDictionary's from a plist. in my viewDidLoad method. I then iterate through my array and create the keys for the sections and the number of rows in each section in my viewWillAppear method
- (void)viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
self.sections = [[NSMutableDictionary alloc] init];
BOOL found;
// Loop through the whiskys and create our keys
for (NSMutableDictionary *whisky in self.drinks)
{
NSString *c = [[whisky objectForKey:NAME_KEY] substringToIndex:1];
found = NO;
for (NSString *str in [self.sections allKeys])
{
if ([str isEqualToString:c])
{
found = YES;
}
}
if (!found)
{
[self.sections setValue:[[NSMutableArray alloc] init] forKey:c];
}
}
// Loop again and sort the whiskys into their respective keys
for (NSDictionary *whisky in self.drinks)
{
[[self.sections objectForKey:[[whisky objectForKey:NAME_KEY] substringToIndex:1]] addObject:whisky];
}
// Sort each section array
for (NSString *key in [self.sections allKeys])
{
[[self.sections objectForKey:key] sortUsingDescriptors:[NSArray arrayWithObject:[NSSortDescriptor sortDescriptorWithKey:NAME_KEY ascending:YES]]];
}
[self.tableView reloadData];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view
NSArray *searchPaths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [searchPaths lastObject];
NSString *writeableDBPath = [documentsDirectory stringByAppendingPathComponent:#"ScotchList.plist"];
NSMutableArray *tmpArray = [[NSMutableArray alloc]initWithContentsOfFile:writeableDBPath];
self.drinks = tmpArray;
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(applicationDidEnterBackground:)
name:UIApplicationDidEnterBackgroundNotification
object:nil];
//Register for application exiting information so we can save data
[[NSNotificationCenter defaultCenter]addObserver:self selector:#selector(applicationWillTerminate:) name:UIApplicationWillTerminateNotification object:nil];
}
All of this works fine and dandy. Then when I delete a row it works fine as well. How ever when I go to a new view it and come back to the tableview the deleted row reappears. So I need to update my original datasource (drinks) because everytime the viewAppears it pulls from the original datasource again. So I tried to get the item (whisky) at the row and remove it from the array. But it throws a sigabrt. This is my delete row method.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
//DELETE THE ROW FROM THE DATA SOURCE
[self.tableView beginUpdates];
[[self.sections valueForKey:[[[self.sections allKeys] sortedArrayUsingSelector:#selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] removeObjectAtIndex:indexPath.row];
NSDictionary *whisky = [[self.sections valueForKey:[[[self.sections allKeys] sortedArrayUsingSelector:#selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] objectAtIndex:indexPath.row];
[self.drinks removeObject:whisky];
if ([[self.sections valueForKey:[[[self.sections allKeys] sortedArrayUsingSelector:#selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]] count] > 0)
{
// Section is not yet empty, so delete only the current row.
[tableView deleteRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else
{
// Section is now completely empty, so delete the entire section.
[self.sections removeObjectForKey:[[[self.sections allKeys] sortedArrayUsingSelector:#selector(localizedCaseInsensitiveCompare:)] objectAtIndex:indexPath.section]];
[tableView deleteSections:[NSIndexSet indexSetWithIndex:indexPath.section]
withRowAnimation:UITableViewRowAnimationFade];
}
[self.tableView endUpdates];
} 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.
}
}
this is what the log shows:
2012-07-06 15:36:42.454 WhiskyBook[3275:907] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArrayI objectAtIndex:]: index 1 beyond bounds [0 .. 0]'
*** First throw call stack:
(0x3998a17b 0x3494395b 0x398d83bd 0x3e6b5 0x32a0cd11 0x328f0d09 0x328f0cbb 0x328f0c95 0x328f09eb 0x328f1369 0x328ef791 0x328dd72d 0x328dd009 0x339a7603 0x339a7233 0x3995a873 0x3995a817 0x39959611 0x398d6be5 0x398d6a71 0x339a634b 0x329037f5 0x3ac09 0x33cc7b20)
libc++abi.dylib: terminate called throwing an exception
(lldb)
What am I doing wrong?

Answer 1

I found a solution to my problem. Instead of trying to remove the object from the original datasource inside of the commitEditingStyle method I just made an NSDictionary property for my master-viewController alloc'd and inited it in my viewDidLoad then assigned it the item that I want to be deleted inside of the commitEditingStyle method. Then inside of my viewWillDisappear method I removed it from the original datasource.