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POiphone EXC_BAD_ACCESS with NSMutableArray
 

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  1. POiphone EXC_BAD_ACCESS with NSMutableArray
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    <p>Ok so I have a UIViewTable and a UISearchBar with two scope buttons. The idea being that when I press a scope button the datasource for UIViewTable gets changed but I am getting EXC_BAD_ACCESS error.</p> <p>I have the following code in my UIViewController SearchViewController.m:</p> <pre><code>- (void)searchBar:(UISearchBar *)searchBar selectedScopeButtonIndexDidChange: (NSInteger) selected scope { MyAppDelegate *delegate = (MyAppDelegate *) [[UIApplicationsharedApplication] delegate]; if (self.listData != nil) { [self.listData release]; } if (selectedScope == 0) { self.listData = [delegate.data getListOne]; } else { self.listData = [delegate.data getListTwo]; } } - (void) viewDidLoad { MyAppDelegate *delegate = (MyAppDelegate*) [[UIApplication sharedApplication] delegate]; self.listData = [delegate.data getListOne]; //some other unrelated code } </code></pre> <p>in my SearchViewController.h I have:</p> <pre><code>@property (nonatomic,retain) NSMutableArray *listData; </code></pre> <p>in my Data.m I have:</p> <pre><code>-(NSMutableArray *) getListOne { NSMutableArray *list = [[NSMutableArray alloc] initWithObjects:@"test1", @"test2", nil]; [list autorelease]; return list; } -(NSMutableArray *) getListTwo { NSMutableArray *list = [[NSMutableArray alloc] initWithObjects:@"test3", @"test4", nil]; [list autorelease]; return list; } </code></pre> <p>It crashes on:</p> <pre><code>self.listData = [delegate.data getListTwo]; </code></pre> <p>I checked that its when I am setting the property that it crashes. My understanding is that when I create the new NSMutableArray in Data.m I assign it autorelease as I should. </p> <p>When the view loads I assign it to my listData and since I am accessing the property which has retain then the reference count is incremented (so its now 2 pending auto release).</p> <p>When I press the button to change the data source I check too see if listData exists (which it always will), release it so that the old NSMutableArray counter will be 0 (assuming autorelease has occured). </p> <p>Then I get a new NSMutableArray and set it to this property... is my understanding correct? I have spent far too long on this simple problem :(</p> <p>oh also I did create another NSMutableArray that was not connected to the tableView and still get the same problem, also if I don't release it in my if statement the problem does not exist but I will then have a memory leak?? I could always just keep the array and remove/add objects but I want to know why this is not working :) cheers</p>
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    1. USQuinn Taylor
    1. USAllan
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    1. COJust as a style tip, you can simplify your methods getListOne/getListTwo in a few ways. For example, you could combine the last 2 lines of each into return [list autorelease]. You can condense it into a single line by returning an autoreleased array generated with +arrayWithObjects instead of +alloc and -initWithObjecs: — it means the same thing but is a bit shorter. :-)
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      1. USQuinn Taylor
 

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