Protocol: UITabBarControllerDelegate

Overview

You use the UITabBarControllerDelegate protocol when you want to augment the behavior of a tab bar. In particular, you can use it to determine whether specific tabs should be selected, to perform actions after a tab is selected, or to perform actions before or after the user customizes the order of the tabs. After implementing these methods in your custom object, you should then assign that object to the delegate property of the corresponding UITabBarController object.Tells the delegate that the tab bar customization sheet was dismissed.Tells the delegate that the user selected an item in the tab bar.Asks the delegate whether the specified view controller should be made active.Tells the delegate that the tab bar customization sheet is about to be displayed.Tells the delegate that the tab bar customization sheet is about to be dismissed.

Instance Method Summary (collapse)

Instance Method Details

- (Object) tabBarController(tabBarController, didEndCustomizingViewControllers:viewControllers, changed:changed)

Tells the delegate that the tab bar customization sheet was dismissed. You can use this method to respond to changes to the order of tabs in the tab bar.

Parameters:

  • tabBarController (UITabBarController) —

    The tab bar controller that is being customized.

  • viewControllers (Array) —

    The view controllers of the tab bar controller. The arrangement of the controllers in the array represents the new display order within the tab bar.

  • changed (Boolean) —

    A Boolean value indicating whether items changed on the tab bar. YES if items changed or NO if they did not.

Returns:

- (Object) tabBarController(tabBarController, didSelectViewController:viewController)

Tells the delegate that the user selected an item in the tab bar. In iOS v3.0 and later, the tab bar controller calls this method regardless of whether the selected view controller changed. In addition, it is called only in response to user taps in the tab bar and is not called when your code changes the tab bar contents programmatically.In versions of iOS prior to version 3.0, this method is called only when the selected view controller actually changes. In other words, it is not called when the same view controller is selected. In addition, the method was called for both programmatic and user-initiated changes to the selected view controller.

Parameters:

  • tabBarController (UITabBarController) —

    The tab bar controller containing viewController.

  • viewController (UIViewController) —

    The view controller that the user selected. In iOS v3.0 and later, this could be the same view controller that was already selected.

Returns:

- (Boolean) tabBarController(tabBarController, shouldSelectViewController:viewController)

Asks the delegate whether the specified view controller should be made active. The tab bar controller calls this method in response to the user tapping a tab bar item. You can use this method to dynamically decide whether a given tab should be made the active tab.

Parameters:

  • tabBarController (UITabBarController) —

    The tab bar controller containing viewController.

  • viewController (UIViewController) —

    The view controller belonging to the tab that was tapped by the user.

Returns:

  • (Boolean) —

    YES if the view controller’s tab should be selected or NO if the current tab should remain active.

- (Object) tabBarController(tabBarController, willBeginCustomizingViewControllers:viewControllers)

Tells the delegate that the tab bar customization sheet is about to be displayed.

Parameters:

  • tabBarController (UITabBarController) —

    The tab bar controller that is being customized.

  • viewControllers (Array) —

    The view controllers to be displayed in the customization sheet. This list typically contains all custom view controllers you added but does not include some standard controllers, such as the one that manages the More tab.

Returns:

- (Object) tabBarController(tabBarController, willEndCustomizingViewControllers:viewControllers, changed:changed)

Tells the delegate that the tab bar customization sheet is about to be dismissed. This method is called in response to the user tapping the Done button on the sheet but before the sheet is dismissed.

Parameters:

  • tabBarController (UITabBarController) —

    The tab bar controller that is being customized.

  • viewControllers (Array) —

    The view controllers of the tab bar controller. The arrangement of the controllers in the array represents the new display order within the tab bar.

  • changed (Boolean) —

    A Boolean value indicating whether items changed on the tab bar. YES if items changed or NO if they did not.

Returns: