Question

Im having a ViewController on which on clicking a button, label gets updated. I want is, each time the app opens it should retain its old value. Im able to write every value in NSUserDefault but not getting how to write the value on label before the app loads.
Example:
In first run the label is having the value 5.
In second run the label should contain the same value 5, and if i made any changes that change should be there in third run.
Thanx…

Answer 1

Here’s how to retrieve a stored value from NSUserDefaults and set the value for your label when your ViewController loads:

- (void)viewDidLoad
{
    [super viewDidLoad];    
    self.myLabel.text = [[NSUserDefaults standardUserDefaults] objectForKey:@"mySavedValue"];
}

I’m assuming your button is already hooked up to an action something like this that will save the value to the standardUserDefaults when clicked:

- (IBAction)buttonPressed:(id)sender
{
    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
    [defaults setObject:self.myLabel.text forKey:@"mySavedValue"];
    [defaults synchronize];
}