Deleting data from a table view

Question

I have a data source that is in dictionary form (for why, see here). I have the following code that gets called in the commitEditing method for the table view:
- (void)removeObjectFromListAtIndex:(NSIndexPath *)indexPath {
NSMutableDictionary *mutableDataDictionary = [[NSMutableDictionary alloc] initWithDictionary:[listContent mutableCopy]];
dNSLog (@"listContent: %@, mutableDataDictionary: %@", listContent, mutableDataDictionary);
dNSLog (@"indexPath.section is %d", indexPath.section);
NSString *section = [[NSString alloc] init];
switch (indexPath.section) {
case 0:
dNSLog (@"Case Zero");
section = @"A";
break;
case 1:
dNSLog (@"Case One");
section = @"B";
break;
case 2:
section = @"C";
break;
case 3:
section = @"D";
break;
case 4:
section = @"E";
break;
case 5:
section = @"F";
break;
case 6:
section = @"G";
break;
case 7:
section = @"H";
break;
case 8:
section = @"I";
break;
case 9:
section = @"J";
break;
case 10:
section = @"K";
break;
case 11:
section = @"L";
break;
case 12:
section = @"M";
break;
case 13:
section = @"N";
break;
case 14:
section = @"O";
break;
case 15:
section = @"P";
break;
case 16:
section = @"Q";
break;
case 17:
section = @"R";
break;
case 18:
section = @"S";
break;
case 19:
section = @"T";
break;
case 20:
section = @"U";
break;
case 21:
section = @"V";
break;
case 22:
section = @"W";
break;
case 23:
section = @"X";
break;
case 24:
section = @"Y";
break;
case 25:
section = @"Z";
break;
default:
dNSLog (@"Default");
section = nil;
break;
if (mutableDataDictionary) {
NSMutableArray *arrayForNameSection = [[[NSMutableArray alloc] initWithArray:[mutableDataDictionary objectForKey:section]] mutableCopy];
[arrayForNameSection removeObjectAtIndex:indexPath.row];
NSArray *array = [[NSArray alloc] initWithArray:arrayForNameSection];
[mutableDataDictionary setObject:array forKey:section];
listContent = [NSDictionary dictionaryWithDictionary:mutableDataDictionary];
[array release];
[arrayForNameSection release];
[section release];
[mutableDataDictionary release];
The code works flawlessly the first time through, but when I try to delete a second item, it crashes with a CALayer exception involving copyWithZone. The analyzer in Xcode (3.2) is telling me something's going on with the NSString section, but I'm not sure what...I'd appreciate any help!
BTW, Ray if you happen to get this, the code is identical to what I emailed you, except that I added this code. The method name is the same.

Answer 1

I have a data source that is in dictionary form (for why, see here). I have the following code that gets called in the commitEditing method for the table view:
- (void)removeObjectFromListAtIndex:(NSIndexPath *)indexPath {
NSMutableDictionary *mutableDataDictionary = [[NSMutableDictionary alloc] initWithDictionary:[listContent mutableCopy]];
// What happens to the mutableCopy? Looks like a leak.
dNSLog (@"listContent: %@, mutableDataDictionary: %@", listContent, mutableDataDictionary);
dNSLog (@"indexPath.section is %d", indexPath.section);
NSString *section = [[NSString alloc] init];
// Memory leak because in all cases you re-assign the variable.
// Arrrgggg!
NSString * section = nil;
if((indexPath.section >= 0) || (indexPath.section < 26))
section = [NSString stringWithFormat: @"%c", 'A' + indexPath.section];
switch (indexPath.section) {
case 0:
dNSLog (@"Case Zero");
section = @"A";
break;
case 1:
dNSLog (@"Case One");
section = @"B";
break;
case 2:
section = @"C";
break;
case 3:
section = @"D";
break;
case 4:
section = @"E";
break;
case 5:
section = @"F";
break;
case 6:
section = @"G";
break;
case 7:
section = @"H";
break;
case 8:
section = @"I";
break;
case 9:
section = @"J";
break;
case 10:
section = @"K";
break;
case 11:
section = @"L";
break;
case 12:
section = @"M";
break;
case 13:
section = @"N";
break;
case 14:
section = @"O";
break;
case 15:
section = @"P";
break;
case 16:
section = @"Q";
break;
case 17:
section = @"R";
break;
case 18:
section = @"S";
break;
case 19:
section = @"T";
break;
case 20:
section = @"U";
break;
case 21:
section = @"V";
break;
case 22:
section = @"W";
break;
case 23:
section = @"X";
break;
case 24:
section = @"Y";
break;
case 25:
section = @"Z";
break;
default:
dNSLog (@"Default");
section = nil;
break;
if (mutableDataDictionary) {
NSMutableArray *arrayForNameSection = [[[NSMutableArray alloc] initWithArray:[mutableDataDictionary objectForKey:section]] mutableCopy];
// Get rid of this copy too.
[arrayForNameSection removeObjectAtIndex:indexPath.row];
NSArray *array = [[NSArray alloc] initWithArray:arrayForNameSection];
[mutableDataDictionary setObject:array forKey:section];
listContent = [NSDictionary dictionaryWithDictionary:mutableDataDictionary];
// This is autoreleased. You might want to retain it.
[array release];
[arrayForNameSection release];
[section release];
[mutableDataDictionary release];