Question

i created a simple project, with a “+” and “-” buttons that increase or decrease a number inside a label.

I wanted to test the registerDefaults method, but if i click on the “home” button, and come back on the project from the simulator (with my app’s icon), the number is still the same on screen.

How can i test the user settings with this example? or is it something with the simulator, or would it work if i use the device and wait for the memory warning method to automatically refresh the project, and then it would work?

here’s a bit of my code :

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    
    self.window.rootViewController = self.viewController;
    [self.window makeKeyAndVisible];

    NSNumber *testValue = [[NSUserDefaults standardUserDefaults] objectForKey:@"kRestore"];
    if (testValue){
        NSLog(@"already");
        viewController.myNum = (int)testValue;
    } else {
        NSLog(@"empty");
        viewController.myNum = 0;
    }

    return YES;
}


- (void)applicationWillResignActive:(UIApplication *)application {

    NSNumber *num = [NSNumber numberWithInt:viewController.myNum];

    NSDictionary *savedNumber = [NSDictionary dictionaryWithObject:num forKey:@"kRestore"];
    [[NSUserDefaults standardUserDefaults] registerDefaults:savedNumber];
    [[NSUserDefaults standardUserDefaults] synchronize];

    NSLog(@"ok resign active");
}

Thanks

Answer 1

Calling -registerDefaults in applicationWillResignActive makes little sense. See my answer here on how registerDefaults works: How to register user defaults using NSUserDefaults without overwriting existing values?

You use it to set the default values. To save a value that is not the default but the users preference, use the various -set.. methods provided.