iOS Preferences and Settings Programming

Set Default Value

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

for (int i = 0; i < 5; i++) {

    NSString *itemKey = [NSString stringWithFormat:@"item%d", i];

    NSNumber *itemValue = [NSNumber numberWithInt:0]; 

    NSDictionary *defaultItem = [NSDictionary dictionaryWithObject:itemValue forKey:itemKey];

    [defaults registerDefaults:defaultItem];

}

Get current value and Increment by one

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

for (int i = 0; i < 5; i++) {

    if (NeedToIncrementByOne[i]) {

        NSString *itemKey = [NSString stringWithFormat:@"item%d", i];

        NSInteger itemValue = [defaults integerForKey:itemKey] + 1;

        [defaults setInteger:itemValue forKey:itemKey];

    }

}

Types Support

setBool:forKey:

setDouble:forKey:

setFloat:forKey:

setInteger:forKey:

setObject:forKey:

setURL:forKey:

setValue:forKey:

Set Nil

setNilValueForKey: