ProMotion::Tabs is a module that is automatically included in PM::Delegate and PM::Screen. It includes methods and functionality dealing with UITabBarController and UITabBarItem.

• Methods
• Class Methods
• Accessors

Methods

set_tab_bar_item(args)

NOTE: icon and system_icon have been deprecated and replaced by item and system_item.

Creates the tab that is shown in a tab bar item. Arguments: { item: "imagename", system_item: UITabBarSystemItemContacts, title: "tabtitle" }

item can be a string, in which case it should exist in your resources folder. But item can also be a UIImage, if you prefer to create one yourself. Additionally, Apple adds a gradient to every UITabBarItem. In order to prevent this, or to control the state of the selected & unselected item, you can pass a hash into item like so (where variable myUIImage is an instance of UIImage):

set_tab_bar_item { item: { selected: my_image, unselected: my_image }, title: "tabtitle" }

It's recommended to use this method in your on_init method OR set it using the class method tab_bar_item (below). on_load won't be called until you actually load the tab, which is too late.

def on_init
  set_tab_bar_item item: "custom_item_5", title: "Custom"
  set_tab_bar_item system_item: :more
  # :more, :favorites, :featured, :top_rated, :recents, :contacts,
  # :history, :bookmarks, :search, :downloads, :most_recent, :most_viewed
end

open_tab_bar(*screens)

Opens a UITabBarController with the specified screens as the root view controller of the current app. iOS doesn't allow opening a UITabBar as a sub-view. The current screen will be deallocated unless included as one of the screens in the tab bar.

def on_load(app, options)
  open_tab_bar HomeScreen, AboutScreen.new(nav_bar: true), ThirdScreen, HelpScreen
end

open_tab(tab)

Opens the tab where the "string" title matches the passed in tab string. You can also provide a number (starting at 0) and the tab with that index will be opened.

open_tab "About"

open_tab 3 # fourth tab is opened

on_tab_selected(view_controller)

Provides a hook that is triggered when a tab is selected and passes in the view controller that has been displayed. Keep in mind that this could be a UINavigationController or other wrapper, so to get the screen you may need to request view_controller.topViewController.

def on_tab_selected(view_controller)
  # Do some action
  view_controller.topViewController # => current screen
end

Class Methods

tab_bar_item(args={})

Class method that sets the screen's default tab bar item.

class TabScreen < PM::Screen
  title "Tab"
  tab_bar_item title: "Tab Item", item: "list", image_insets: [5,5,5,5]
end

Accessors

tab_bar

Contains a reference to the current screen's tab bar controller.

tab_bar_item

Contains the settings hash used to set up the tab bar item. If you set this manually, make sure to call refresh_tab_bar_item right afterward.