Swift: Buttons not working

Hi everybody!

I try to add an action handler and alternative handler. It does not work ... Can anybody help me?

let bulletinManager: BLTNItemManager = {
let rootItem = BLTNPageItem(title: "Welcome")

rootItem.descriptionText = "Would you like to add Sample Data to your database?"
rootItem.actionButtonTitle = "Add"
rootItem.alternativeButtonTitle = "Not now"
rootItem.isDismissable = false

rootItem.actionHandler = { (item: BLTNActionItem) in
item.actionButtonTitle = "tapped"
}



rootItem.alternativeHandler = { (item: BLTNActionItem) in
print("Alternative button tapped")
}

return BLTNItemManager(rootItem: rootItem)
}()

`