NSUserDefaults值未保存到iPhone

Question

Using the below code to save the sessionID.

 NSUserDefaults *sessions = [NSUserDefaults standardUserDefaults];

[sessions setObject:sID forKey:@"sessionsID"];

[sessions synchronize];

NSLog(@"Session Value Saved");

The code to retrieve the value is:

NSUserDefaults *sessions = [NSUserDefaults standardUserDefaults];

NSString *myString = [sessions stringForKey:@"sessionsID"];

NSLog(@"nsuser: %@", myString);

But on console it is showing like:

2012-01-03 15:37:37.292 LoginTest[574:12503] sID: c339af83caa5355d124f70e3f22c193d
2012-01-03 15:37:37.296 LoginTest[574:12503] Session Value Saved
2012-01-03 15:37:37.297 LoginTest[574:12503] Accounts: ("uid=demo@url.com", "o=Demo","o=Und")
2012-01-03 15:37:37.302 LoginTest[574:12503] sID: (null)
2012-01-03 15:37:37.304 LoginTest[574:12503] Session Value Saved
2012-01-03 15:37:37.304 LoginTest[574:12503] Accounts: (null)
2012-01-03 15:37:37.305 LoginTest[574:12503] No Session created

why is it being called two times and once it saves the values and shows them up and second time giving null.

I am using ARC.

I am messed-up with this... please guide me how can I resolve this issue

Answer 1

We dont know why it's getting called twice; it's your app :)

Put a breakpoint on [sessions setObject:sID forKey:@"sessionsID"];

The first time this gets hit sID will be valid.

Then something is happening that is invalidating sID :(

The second time it gets hit it looks like sID is null - you should be able to use the console / stack to work out why it's being called twice.