Question

Solved….Check at bottom of Body..

I am using XCODE 4

I have an Money Calculator Application in which I have to press the digit buttons and I have to see it on the TextLabel.

Format like : “$ 500”

So for $ I am appending it..

The method works twice well but the third time it crashes..

Rest if you see the code you will have an Idea.

In my Application I have Three String variables…

-(void)viewDidLoad
{

  current =[[NSString alloc] retain];

  current=[[NSUserDefaults standardUserDefaults] valueForKey:@"Total"]];



  NSString *newCurrent=[NSString stringWithFormat:@"$ %@",current];

  textViewer.text=newCurrent;

 NSLog(@"%@",current);

}

-(IBAction)buttonDigitPressed:(id)sender {

NSString *str= (NSString* )[sender currentTitle];

//NSLog(@"1 The Value Of String %@",str);

NSLog(@"Befor Appending %@",current);


if([current isEqualToString:@"0"])
{
    current =  str;
}
else 
{

   current = [current stringByAppendingString:str];

    NSLog(@"After Appending %@",current);

}


NSString *newCurrent=@"$ ";

newCurrent = [newCurrent stringByAppendingString:current];

textViewer.text= newCurrent;  

}
Error is 1st time it is working fine but

when I call it second time, current is Pointing to some Standard Time
formatted value, some time it points to some file name value,

Error is: EXC BAD ACCESS
When I am doing it without newCurrent means without appending a letter it works fine.

——-SOLVED—————-
Every thing is Ok with My Code I just have to right [current retain]; where ever I am appending the String to the current.

As I was receiving the error EXC BAD ACCESS means I was referring to the Object which was released previously.
So, I have retained the Object instead.

Answer 1

Try this code (without memory leaks):

-(void) viewDidLoad
{
    current=[[NSString alloc] initWithString:@"20"];
}

-(IBAction)buttonDigitPressed:(id)sender
{
    NSString *str= (NSString* )[sender currentTitle];

    NSString *nCurrent = [current stringByAppendingString:str];
    [current release];
    current = [nCurrent retain];

   NSString *newCurrent=[[NSString alloc] initWithFormat:@"a%@", current];
   textViewer.text= newCurrent;
   [newCurrent release];
}

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