CODEWITHSUNDEEP
iphoneiosxcodensuserdefaults
user1581885
user1581885

Reputation: 1

ViewDidLoad method doesnt keep a variable?

Here is my question:

In the viewDidLoad method I create a variable using NSUserDefaults (if its the "first run" I create it and fill it with NSNumber. Then I try to use it in another method and ... nothing. It looks like its empty. Anyone can help me? Lot of Thanks

- (void)viewDidLoad {

NSUserDefaults *defaults =[NSUserDefaults standardUserDefaults];

if ([defaults objectForKey:@"seriesBool"]!=nil)

{
    seriesBool = [defaults objectForKey:@"seriesBool"];

}

else

{
    int i;

    seriesBool = [NSMutableArray arrayWithCapacity:9];

    for(i=0; i<9; i++)

    {
       [seriesBool addObject:[NSNumber numberWithBool:YES]];

    }

}


-(IBAction)toAction:(id)sender
{
NSLog(@"array: %@", seriesBool);
}

seriesBool is empty...

Upvotes: 0

Views: 166

Answers (2)

Rams
Rams

Reputation: 1751

You have to set properties like

@property(nonatomic,retain) NSMutableArray * seriesBool;

and use it

self.seriesBool = [NSMutableArray arrayWithCapacity:9];

or

use

 seriesBool = [[NSMutableArray alloc] initWithCapacity:9];

instead of 

seriesBool = [NSMutableArray arrayWithCapacity:9];

& u have to alloc and assign the object

seriesBool = [[NSMutableArray alloc] init];
seriesBool = [defaults objectForKey:@"seriesBool"];

Upvotes: 3

Bruno Koga
Bruno Koga

Reputation: 3874

You need to learn first the basics of Memory Management. What's happening there is, basically, that you're not retaining the seriesBool iVar.

Take a look here: https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/MemoryMgmt/Articles/MemoryMgmt.html

Try to retain your iVar or, better, create a strong/retain property and use the accessor methods.

Upvotes: 1

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