Question

All,

I’m sure I’m overlooking something, but I’ve been staring at this code for too long trying to figure out what’s going on.

-(IBAction)continue:(id)sender
{
    //setters for the limits
    NSLog(@"Log ageUnder18: %@", ageUnder18.text);   //returns Y
    NSMutableDictionary *cardLimits;
    [cardLimits setObject:ageUnder18.text forKey:@"ageUnder18"];
    NSLog(@"Just set %@", [cardLimits objectForKey:@"ageUnder18"]); //returns NULL

//more code here
}

Why is that returning NULL?

Thanks in advance,
James

Answer 1

You’re not initializing your variable. In fact, you’re rather lucky that you aren’t crashing outright on the -setObject:forKey: line. Your cardLimits variable currently holds garbage memory, i.e. whatever was on the stack at the address that the variable occupies. You need to use

NSMutableDictionary *cardLimits = [NSMutableDictionary dictionary];

Note that the Static Analyzer should be able to catch this for you.