When to use lazy instantiation in iOS?

Question

I\'ve heard that lazy instantiation of objects in iOS is pretty common, however I\'m not exactly sure when I should use it? Could someone give a brief explanation of when I

Answer 1

Not only for memory and performance, check this out, here's another example:

- (NSArray *)validElements{
    if (!_validElements) {
        _validElements = [[NSArray alloc] initWithObjects:
                          @"mystuff",@"generaldescription",@"title",@"autor",
                          @"version",@"date",@"context",@"operatingsystem",@"kindofdevice",
                          @"deviceversion",@"rule",@"daytime",@"time",@"location",@"deviceheading",
                          @"region",@"language",nil];
    }
    return _validElements;
}

You can use lazy instantiation for doing a custom init or special configuration and yes also this benefits memory and performance.