CSLinearLayoutView for iOS app not working as expected

I'm trying to use CSLinearLayoutView in an iPhone app, and I'm following the demo code to try and apply it. However, when I attempt to create a linear Layout of buttons (very basic just to test it) they all stack on top of each other instead of laying out how they should. what am I doing wrong? screenshot

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
    // create the linear layout view
    CSLinearLayoutView *linearLayoutView = [[CSLinearLayoutView alloc] initWithFrame:self.view.bounds];
    linearLayoutView.orientation = CSLinearLayoutViewOrientationVertical;
    [self.view addSubview:linearLayoutView];

    UILabel *label1 = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, self.view.frame.size.width, 20)];
    label1.text = @"label1";

    // create a layout item for the view you want to display
    CSLinearLayoutItem *item = [CSLinearLayoutItem layoutItemForView:label1];
    item.padding = CSLinearLayoutMakePadding(5.0, 10.0, 5.0, 10.0);
    item.horizontalAlignment = CSLinearLayoutItemHorizontalAlignmentCenter;
    item.fillMode = CSLinearLayoutItemFillModeNormal;

    // add the layout item to the linear layout view
    [linearLayoutView addItem:item];


    UILabel *label2 = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
    label1.text = @"label2";

    // create a layout item for the view you want to display
    CSLinearLayoutItem *item2 = [CSLinearLayoutItem layoutItemForView:label2];
    item.padding = CSLinearLayoutMakePadding(5.0, 10.0, 5.0, 10.0);
    item.horizontalAlignment = CSLinearLayoutItemHorizontalAlignmentCenter;
    item.fillMode = CSLinearLayoutItemFillModeNormal;




    UILabel *label3 = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
    label1.text = @"label3";

    // create a layout item for the view you want to display
    CSLinearLayoutItem *item3 = [CSLinearLayoutItem layoutItemForView:label3];
    item.padding = CSLinearLayoutMakePadding(5.0, 10.0, 5.0, 10.0);
    item.horizontalAlignment = CSLinearLayoutItemHorizontalAlignmentCenter;
    item.fillMode = CSLinearLayoutItemFillModeNormal;


    UILabel *label4 = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
    label1.text = @"label4";


    // create a layout item for the view you want to display
    CSLinearLayoutItem *item4 = [CSLinearLayoutItem layoutItemForView:label4];
    item.padding = CSLinearLayoutMakePadding(5.0, 10.0, 5.0, 10.0);
    item.horizontalAlignment = CSLinearLayoutItemHorizontalAlignmentCenter;
    item.fillMode = CSLinearLayoutItemFillModeNormal;

    CSLinearLayoutView *linearLayoutView2 = [[CSLinearLayoutView alloc] initWithFrame:self.view.bounds];
    linearLayoutView.orientation = CSLinearLayoutViewOrientationHorizontal;

    [linearLayoutView2 addItem:item2];
    [linearLayoutView2 addItem:item3];
    [linearLayoutView2 addItem:item4];




    // create a layout item for the view you want to display
    CSLinearLayoutItem *horizontal = [CSLinearLayoutItem layoutItemForView:linearLayoutView2];
    item.padding = CSLinearLayoutMakePadding(5.0, 10.0, 5.0, 10.0);
    item.horizontalAlignment = CSLinearLayoutItemHorizontalAlignmentCenter;
    item.fillMode = CSLinearLayoutItemFillModeNormal;

    [linearLayoutView addItem:horizontal];


}