Question

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).

MainViewController.h

#import "OnlineCheckViewController.h"

@interface MainViewController : UIViewController
{
    NSString *userID;
}
@end

MainViewController.m

#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];
}

OnlineCheckViewController.h

#import <UIKit/UIKit.h>
#import "OnlineCheckResultsViewController.h"

@protocol OnlineCheckViewControllerDelegate;

@interface OnlineCheckViewController : UIViewController 
     <OnlineCheckResultsViewControllerDelegate>
{
    NSString *user_id;
}

@property (nonatomic, assign) id <OnlineCheckViewControllerDelegate> delegate;
@property (nonatomic, retain) NSString *user_id;

@end

OnlineCheckViewController.m

#import "OnlineCheckViewController.h"

@synthesize user_id;
@synthesize delegate=_delegate;

- (void)dealloc
{
    [user_id release];
    [super dealloc];
}
- (void)viewDidUnload
{
    [self setUser_id:nil];
    [super viewDidUnload];
}

Thanks!

Answer 1

Thanks to all your answers.

I have resolved this issue.

In MainViewController.h

I have added userID IBOutlet

@property (nonatomic, retain) IBOutlet NSString *userID;

In MainViewController.m

@synthesize userID;

- (IBAction)OnlineCheck:(id)sender
{
controller.user_id = self.userID;
}

- (void)viewDidUnload
{
self.userID = nil;
}

- (void)dealloc
{
[userID release];
}

In OnlineCheckViewController.h

Changed to assign

@property (nonatomic, assign) NSString *user_id;

In OnlineCheckViewController.m

- (void)dealloc
{
// removed
// [user_id release];
}

- (void)viewDidUnload
{
// removed
// [self setUser_id:nil];
}