NSUserDefault

[thh022]

My first try using the NSUserDefault where the user can save their own favourites in. I use a NSMutableArray to store the NSUserDefault-objects in, but I can't get it quite right:

NSMutableArray *tempArray = [[NSMutableArray alloc] init];

NSUserDefaults *temp1 = [NSUserDefaults standardUserDefaults];
[temp1 setObject:@"string 1" forKey:@"name"];
[temp1 synchronize];
[tempArray addObject:temp1];

NSUserDefaults *temp2 = [NSUserDefaults standardUserDefaults];
[temp2 setObject:@"string 2" forKey:@"name"];
[temp2 synchronize];
[tempArray addObject:temp2];

for(int i=0; i<[tempArray count]; i++){
   NSUserDefaults *tempNSUserDefaults = [tempArray objectAtIndex:i];
   NSLog(@"Test: %@", [tempNSUserDefaults stringForKey:@"name"]);
}

The output is:

Test: string 2
Test: string 2

It seems like the second NSUserDefault overwrite the first one. I'm am missing something?

[baja_yu]

Why are you adding NSUserDefaults objects to the array? Defaults are a singleton object, and you shouldn't be retaining them anywhere.

[SundialSoft]

Originally Posted by thh022

My first try using the NSUserDefault where the user can save their own favourites in. I use a NSMutableArray to store the NSUserDefault-objects in, but I can't get it quite right:

NSMutableArray *tempArray = [[NSMutableArray alloc] init];

NSUserDefaults *temp1 = [NSUserDefaults standardUserDefaults];
[temp1 setObject:@"string 1" forKey:@"name"];
[temp1 synchronize];
[tempArray addObject:temp1];

NSUserDefaults *temp2 = [NSUserDefaults standardUserDefaults];
[temp2 setObject:@"string 2" forKey:@"name"];
[temp2 synchronize];
[tempArray addObject:temp2];

for(int i=0; i<[tempArray count]; i++){
   NSUserDefaults *tempNSUserDefaults = [tempArray objectAtIndex:i];
   NSLog(@"Test: %@", [tempNSUserDefaults stringForKey:@"name"]);
}

The output is:

Test: string 2
Test: string 2

It seems like the second NSUserDefault overwrite the first one. I'm am missing something?

NSUserDefaults is where you store various data and then recover it from there. You store them like this

       [[NSUserDefaults standardUserDefaults] setObject:toDoStates forKey:@"toDoStates"];

(where toDoStates is an NSArray)
and retrieve them like this

    NSArray* toDoStates = [[NSUserDefaults standardUserDefaults] objectForKey:@"toDoStates"];

Have a look for posts about this topic as there are various nuances depending on what you want to save.

[thh022]

I thought I could save them in an array. The reason why I tried it this way is that the app is having a list of names and the users can set the names they want as a favourite. I need to save these names someway and the list could be from 0 until 50 names so it has to by dynamic.

Any suggestions how to do this?

[SundialSoft]

the example I posted is saving an array!

[thh022]

Ahh, sorry that I didn´t see that.

Thanks, now I got it to work!

In my case I use an array for saving names. Only hazzle to use arrays with NSUserDefaults is that it returns an NSArray and not an NSMutableArray.

Here´s a couple of good readings for those who want to use NSUserDefaults:

iPhone Development 101: User Defaults
CocoaDev: NSUserDefaults