Question

Trying to use class variables in thread and getting EXC_BAS_ACCESS.
Code snippet:

@interface ViewController : UIViewController {    
    NSString* accountLoginName;
    NSString* accountPassword; 
}

in implementation:

accountLoginName = [NSString stringWithString:textFieldLoginName.text];
accountPassword = [NSString stringWithString:textFieldPassword.text];
[self performSelectorInBackground:@selector(loginAtBackgroundSelector:) withObject:nil]; 


-(void)loginAtBackgroundSelector:(UIAlertView*)alert
{   
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSLog(@"%@\n%@", accountLoginName, accountPassword);
    [self login];
    [self dismissAlert:alert];
    [pool release];
}

just trying to write to console and getting error in this part of code, but error in the loginAtBackgroundSelector appears from time to time.

-(AlertType)login
{
     NSLog(@"%@\n%@", accountLoginName, accountPassword);
}

Answer 1

Try this in interface:

@interface ViewController : UIViewController {    
    NSString* accountLoginName;
    NSString* accountPassword; 
}
@property(nonatomic, retain) NSString* accountLoginName;
@property(nonatomic, retain) NSString* accountPassword;

And this in the implementation (in the place where you assign the values):

self.accountLoginName = [NSString stringWithString:textFieldLoginName.text];
self.accountPassword = [NSString stringWithString:textFieldPassword.text];
[self performSelectorInBackground:@selector(loginAtBackgroundSelector:) withObject:nil];

Additionaly in the dealloc:

-(void)dealloc {
    [accountLoginName release];
    [accountPassword release];
    [super dealloc];
}

Let me know if it helps.