- (void)viewWillAppear:(BOOL)animated
{
    NSLog(@"viewWillAppear");
}

- (void)viewDidAppear:(BOOL)animated
{
    NSLog(@"viewDidAppear");
}

- (void)viewWillDisappear:(BOOL)animated
{
    NSLog(@"viewWillDisappear");
}

- (void)viewDidDisappear:(BOOL)animated
{
    NSLog(@"viewDidDisappear");
}