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POiPhone memory management, EXC_BAD_ACCESS NSString between views
 

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  1. POiPhone memory management, EXC_BAD_ACCESS NSString between views
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    <p>I have some problems with memory management, I think my problem is the assignment, and object releases. I want to assign a NSString (userID) value to another NSString in other view (user_id).</p> <p><strong>MainViewController.h</strong></p> <pre><code>#import "OnlineCheckViewController.h" @interface MainViewController : UIViewController { NSString *userID; } @end </code></pre> <p><strong>MainViewController.m</strong></p> <pre><code>#import "MainViewController.h" - (IBAction)OnlineCheck:(id)sender { OnlineCheckViewController *controller = [[OnlineCheckViewController alloc] initWithNibName:@"OnlineCheckViewController" bundle:nil]; controller.delegate = self; controller.user_id = userID; controller.modalTransitionStyle = UIModalTransitionStyleCoverVertical; [self presentModalViewController:controller animated:YES]; [controller release]; } - (void)viewDidUnload { userID = nil; [super viewDidUnload]; } - (void)dealloc { [userID release]; [super dealloc]; } </code></pre> <p><strong>OnlineCheckViewController.h</strong></p> <pre><code>#import &lt;UIKit/UIKit.h&gt; #import "OnlineCheckResultsViewController.h" @protocol OnlineCheckViewControllerDelegate; @interface OnlineCheckViewController : UIViewController &lt;OnlineCheckResultsViewControllerDelegate&gt; { NSString *user_id; } @property (nonatomic, assign) id &lt;OnlineCheckViewControllerDelegate&gt; delegate; @property (nonatomic, retain) NSString *user_id; @end </code></pre> <p><strong>OnlineCheckViewController.m</strong></p> <pre><code>#import "OnlineCheckViewController.h" @synthesize user_id; @synthesize delegate=_delegate; - (void)dealloc { [user_id release]; [super dealloc]; } - (void)viewDidUnload { [self setUser_id:nil]; [super viewDidUnload]; } </code></pre> <p>Thanks!</p>
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    1. USEdu Lomeli
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    1. COHow is userID initialized?
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      1. POiPhone memory management, EXC_BAD_ACCESS NSString between views
      1. USJim Rhodes
    2. COI don't see where user_id or userID are being created (alloc'd). With an assignment like user_id = userID you would not be performing a [... release] on both. You would need to release only one of them. Also, do not assign nil before releasing
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      1. POiPhone memory management, EXC_BAD_ACCESS NSString between views
      1. USJohn Carter
 

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