EXC_BAD_ACCESS on a NSMutableArray that contains a custom class - iphone

Question

I receive I EXC_BAD_ACCESS but i can't understand why.
this is the code:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
TDBadgedCell *cell = [[[TDBadgedCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];
SubscriptionArray * element =[reader.subscriptions objectAtIndex:[indexPath row]];
[cell.textLabel setText:element.title]; // <--- error at this line of code
return cell;
}
reader.subscritions is NSMutableArray that contains 81 elements ( I'm sure verificated with a NSLog) but when I try to get set the title I have this error... why?
SubscritionArray is a custom class that contains 3 string and 1 int.
Custom class:
header
#import <Foundation/Foundation.h>
#interface SubscriptionArray : NSObject{
NSString *title;
NSString *source;
NSString *htmlUrl;
NSInteger count;
}
#property (nonatomic,retain) NSString *title;
#property (nonatomic,retain) NSString *source;
#property (nonatomic,retain) NSString *htmlUrl;
#property (nonatomic) NSInteger count;
#end
implementation:
#import "SubscriptionArray.h"
#implementation SubscriptionArray
#synthesize title,source,htmlUrl,count;
-(void)dealloc{
[title release];
[source release];
[htmlUrl release];
}
- (id)initWithCoder:(NSCoder *)decoder {
if (self = [super init]) {
title = [[decoder decodeObjectForKey:#"title"] retain];
source = [[decoder decodeObjectForKey:#"source"] retain];
htmlUrl = [[decoder decodeObjectForKey:#"htmlUrl"] retain];
//count = [decoder decodeIntForKey:#"count"];
}
return self;
}
- (void)encodeWithCoder:(NSCoder *)encoder {
if (title) [encoder encodeObject:title forKey:#"title"];
if (source) [encoder encodeObject:source forKey:#"source"];
if (htmlUrl) [encoder encodeObject:htmlUrl forKey:#"htmlUrl"];
//if (count) [encoder encodeInteger:count forKey:#"count"];
}
#end
EDIT
Tha's what I get
* -[__NSArrayM objectAtIndex:]: message sent to deallocated instance 0xe5a8260
And that's how I set the NSMutableArray
subscriptions = [[NSMutableArray alloc]init];
NSArray *paths = NSSearchPathForDirectoriesInDomains
(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//make a file name to write the data to using the
//documents directory:
NSString *fullFileName = [NSString stringWithFormat:#"%#/subscriptions", documentsDirectory];
[subscriptions removeAllObjects];
subscriptions = [NSKeyedUnarchiver unarchiveObjectWithFile:fullFileName];

Answer 1

I'd venture to say that your array of subscription elements isn't matching up with your row indexes (just a guess). Suggest that you set a debugger breakpoint immediately after you've declared 'element' and before you attempt to set the label. You should be able to see if you have actually obtained one of your SubscriptionArray objets...

Answer 2

The mutable array in reader.subscriptions is getting deallocated before you attempt to reference it in tableView:cellForRowAtIndexPath:. Make sure that the subscriptions array is properly retained or copied by the reader, and that you're not overreleasing it by sending an extra release or autorelease message somewhere. It might help to post the relevant code from the class of the reader instance.