NsuserDefaults key returns (null)

Question

Nsuserdefault key returns "(null)" on initial run after installation. How can i check a key exist or not. I have refferred many links ,it say to check It is nill or not. But it didn't worked.

enter code here

- (NSString *)getTalkText
{
    NSString *storedUsername = [[NSUserDefaults standardUserDefaults] objectForKey:PERS_STORED_TalkText];
    return storedUsername;
 }

if(![[[AppManager sharedManager] getTalkText]isEqualToString:@""] || [[AppManager sharedManager]getTalkText]!=nil)

    {
        self.talkTextView.text=[[AppManager sharedManager]getTalkText];
    }

Please be more specific, and include some code. Help us help you. — Sam Fischer, Feb 17 '15 at 07:04
see so answer http://stackoverflow.com/questions/1964873/nsuserdefaults-how-to-tell-if-a-key-exists — Deepesh, Feb 17 '15 at 07:06

score 1 · Accepted Answer · answered Feb 17 '15 at 07:26

1

you have not check the conditions in correct way. Do it by below way:

if([[AppManager sharedManager] getTalkText]!=nil && [[[AppManager sharedManager] getTalkText] length] > 0)
{
// Do the rest
}

answered Feb 17 '15 at 07:26

Apurv

17,116
8
51
67

score 1 · Answer 2 · answered Feb 17 '15 at 07:34

This is the simplest way to check if a particular value for a key is present of not

NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
NSObject * object = [userDefaults objectForKey:@"your_key"];
if(object != nil){
    NSLog(@"Object is not nil");
    //do your operations here
}else{
    NSLog(@"Object is nil");
}

score 0 · Answer 3 · answered Feb 17 '15 at 07:11

0

if(([[NSUserDefaults standardUserDefaults] objectForKey:@"YOUR_KEY"]) != (id)[NSNull null] || [([[NSUserDefaults standardUserDefaults] objectForKey:@"YOUR_KEY"]) length] != 0)) {

// value available 
}
else{
// null
}

answered Feb 17 '15 at 07:11

KDeogharkar

10,939
7
51
95

score 0 · Answer 4 · edited May 23 '17 at 12:15

It should definitely return nil if there is no object in NSUserDefaults. Even more if it's just after installation, it should only contain some Apple keys (e.g. AppleLanguages). You can inspect it's contents by adding this line somewhere in your [UIApplicationDelegate application:didFinishLaunchingWithOptions:] method:

NSLog(@"%@", [NSUserDefaultsstandardUserDefaults].dictionaryRepresentation);

If you want to just add a default value, please consider using [NSUserDefaults registerDefaults] method as described here: What is the use of -[NSUserDefaults registerDefaults:]?

NsuserDefaults key returns (null)

4 Answers4