Question

I used NSUserDefaults to store a value. I store some integer value in NSUserDefaults like as follows in first view.

I declared in interface file as follows..

NSUserDefaults *prefs;
    @property(nonatomic,retain) IBOutlet NSUserDefaults *prefs;

Then I used in class file as follows

   @synthesize passwordfield,prefs;

here passwordfield is the name of UITextField

NSInteger myInteger = [passwordfield.text integerValue];
[prefs setInteger:myInteger forKey:@"integerKey"];
[prefs synchronize];
NSInteger myInt = [prefs integerForKey:@"integerKey"];
NSLog(@"My integer Value: %d",myInt);

Then I move to next view using navigation controller.

But I can’t read NSUserDefaults’s value from the first view.

I used code like as follows in second view.

PasswordCheckViewController *nextController = [[PasswordCheckViewController alloc] initWithNibName:@"PasswordCheckViewController" bundle:nil];
NSLog(@"Pass in Next: %d",[nextController.prefs integerForKey:@"integerKey"]);

But the output as follows.

 Pass in Next: 0

How can I get the value from the first view to second view using NSUserDefaults?

Answer 1

What you are doing is wrong,NSUserDefaults are not IBOutlets,an IBOutlet is used to refer an InterfaceBuilder control.

NSUserDefault is usually used to store some preference values.
Typically, you use the NSUserDefaults class by invoking the standardUserDefaults class method to get an NSUserDefaults object. This method returns a global NSUserDefaults object with a search list already initialized. Use the objectForKey: and setObject:forKey: methods to get and set default values. Note that a default’s value can be only property list objects: NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary
In your case you are creating an IBOutlet which is not needed. Do like this

  NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults]; 
  NSInteger myInteger = [passwordfield.text integerValue];
  [prefs setObject:myInteger forKey:@"integerKey"];
  NSInteger myInt = [prefs objectForKey:@"integerKey"];

this will give you a synchronized NSUserDefaults so that you dont need to store anything as an ivar.
You can access the value of the object from any classes inside your app