Question

I’m trying to store the value of an label in a NSUserDefault key prevmode but when it doesn’t appear to be storing and when trying to recall after it says in debugger Invalid CFStringRef.

The code to store is

//Check for previous mode 
NSUserDefaults *defaults;
NSString *prevmode;
prevmode = passLength.text;

[defaults setObject:prevmode forKey:@"prevmode"];

and to recover is

NSUserDefaults *defaults;

NSString *prevmode;

prevmode = [defaults objectForKey:@"prevmode"];

Answer 1

As expressed in the comments above, we need a valid pointer to an instance of NSUserDefaults:

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];