FoldingTabBar.iOS

Folding Tab Bar and Tab Bar Controller

Inspired by this project on Dribbble

Also, read how it was done in our blog

Requirements

iOS 7.0

Installation

CocoaPods

pod 'FoldingTabBar', '~> 1.2.1'

Carthage

github "Yalantis/FoldingTabBar.iOS" ~> 1.2.1

Manual Installation

Alternatively you can directly add all the source files from FoldingTabBar folder to your project.

1. Download the latest code version or add the repository as a git submodule to your git-tracked project.
2. Open your project in Xcode, then drag and drop all the folder directories in FoldingTabBar folder onto your project (use the "Product Navigator view"). Make sure to select Copy items when asked if you extracted the code archive outside of your project.

Introduction

YALFoldingTabBarController

YALFoldingTabBarController is a subclass of UITabBarController with custom animating YALFoldingTabBar.

YALFoldingTabBar

YALFoldingTabBar is a subclass of a standard UIView. We wanted to make this component expand and contract in response to a user tapping. When the component is closed you can only see a central button (“+”). When tapping on it, our custom Tab Bar expands letting other tabBarItems appear, so that the user can switch the controllers.

Each separate tabBarItem can have two additional buttons on the left and right. These buttons can be used to let a user interact with a selected screen on the YALFoldingTabBarController without even having to leave it.

YALTabBarItem

YALTabBarItem is a model to configure your tab bar items with images.

Usage

Option 1: The simplest way is to use YALFoldingTabBarController as it is. You can also subclass it if you indend to change the default behaviour.

Option 2: You can write your own implementation of UITabBarController and use YALFoldingTabBar or its subclass.

Here is an instruction of how to use YALFoldingTabBarController in the Storyboard.

1. Add native UITabBarController to the storyboard, establish relationships with its view controllers.
2. Choose YALFoldingTabBarController as custom class for UITabBarController.
3. Choose YALCustomHeightTabBar as custom class for UITabBar inside YALFoldingTabBarController
4. In AppDelegate method take out an instance of YALFoldingTabBarController from the window.rootViewController and supply it with images for the left and right tabBarItems respectively. Also you can add your own image for the center button of YALFoldingTabBar.

Objective-C

    YALFoldingTabBarController *tabBarController = (YALFoldingTabBarController *) self.window.rootViewController;

    //prepare leftBarItems
    YALTabBarItem *item1 = [[YALTabBarItem alloc] initWithItemImage:[UIImage imageNamed:@"nearby_icon"]
                                                      leftItemImage:nil
                                                     rightItemImage:nil];
    
    
    YALTabBarItem *item2 = [[YALTabBarItem alloc] initWithItemImage:[UIImage imageNamed:@"profile_icon"]
                                                      leftItemImage:[UIImage imageNamed:@"edit_icon"]
                                                     rightItemImage:nil];
    
    tabBarController.leftBarItems = @[item1, item2];

    //prepare rightBarItems
    YALTabBarItem *item3 = [[YALTabBarItem alloc] initWithItemImage:[UIImage imageNamed:@"chats_icon"]
                                                      leftItemImage:[UIImage imageNamed:@"search_icon"]
                                                     rightItemImage:[UIImage imageNamed:@"new_chat_icon"]];
    
    
    YALTabBarItem *item4 = [[YALTabBarItem alloc] initWithItemImage:[UIImage imageNamed:@"settings_icon"]
                                                      leftItemImage:nil
                                                     rightItemImage:nil];
    tabBarController.rightBarItems = @[item3, item4];

Swift

    if let tabBarController = window?.rootViewController as? YALFoldingTabBarController {

        //leftBarItems

        let firstItem = YALTabBarItem(
            itemImage: UIImage(named: "nearby_icon")!,
            leftItemImage: nil,
            rightItemImage: nil
        )

        let secondItem = YALTabBarItem(
            itemImage: UIImage(named: "profile_icon")!,
            leftItemImage: UIImage(named: "edit_icon")!,
            rightItemImage: nil
        )

        tabBarController.leftBarItems = [firstItem, secondItem]

        //rightBarItems

        let thirdItem = YALTabBarItem(
            itemImage: UIImage(named: "chats_icon")!,
            leftItemImage: UIImage(named: "search_icon")!,
            rightItemImage: UIImage(named: "new_chat_icon")!
        )

        let forthItem = YALTabBarItem(
            itemImage: UIImage(named: "settings_icon")!,
            leftItemImage: nil,
            rightItemImage: nil
        )

        tabBarController.rightBarItems = [thirdItem, forthItem]
    }

If you want to handle touches on extra tabBarItems import YALTabBarDelegate protocol to the subclass of the proper UIVIewController and implement these methods: ##Objective-C

- (void)tabBarDidSelectExtraLeftItem:(YALFoldingTabBar *)tabBar;
- (void)tabBarDidSelectExtraRightItem:(YALFoldingTabBar *)tabBar;

Swift

func tabBarDidSelectExtraLeftItem(tabBar: YALFoldingTabBar!)
func tabBarDidSelectExtraRightItem(tabBar: YALFoldingTabBar!)

If you want to handle touches on tabBarItems by indexes import YALTabBarDelegate protocol to the subclass of the proper UIVIewController and implement these methods:

Objective-C

- (void)tabBar:(YALFoldingTabBar *)tabBar didSelectItemAtIndex:(NSUInteger)index;
- (BOOL)tabBar:(YALFoldingTabBar *)tabBar shouldSelectItemAtIndex:(NSUInteger)index;

Swift

func tabBar(tabBar: YALFoldingTabBar!, didSelectItemAtIndex index: UInt)
func tabBar(tabBar: YALFoldingTabBar!, shouldSelectItemAtIndex index: UInt) -> Bool

If you want to observe contracting and expanding animation states in YALFoldingTabBar the following methods of YALTabBarDelegate protocol can be implemented:

Objective-C

- (void)tabBarWillCollapse:(YALFoldingTabBar *)tabBar;
- (void)tabBarWillExpand:(YALFoldingTabBar *)tabBar;

- (void)tabBarDidCollapse:(YALFoldingTabBar *)tabBar;
- (void)tabBarDidExpand:(YALFoldingTabBar *)tabBar;

Swift

func tabBarWillCollapse(tabBar: YALFoldingTabBar!)
func tabBarWillExpand(tabBar: YALFoldingTabBar!)

func tabBarDidCollapse(tabBar: YALFoldingTabBar!)
func tabBarDidExpand(tabBar: YALFoldingTabBar!)

Important notes

Because we changed the height of the default UITabBar you should adjust your content to the bottom of viewcontroller's superview, and ignore Bottom Layout Guide. You should also uncheck 'Under bottom bars'

You can see how we did it on the example project.

Tips for customization

You can make the following configurations for custom tabBar:

1. Specify height

Objective-C

tabBarController.tabBarViewHeight = YALTabBarViewDefaultHeight;

Swift

tabBarController.tabBarViewHeight = YALTabBarViewDefaultHeight

2. Specify insets and offsets

Objective-C

    tabBarController.tabBarView.tabBarViewEdgeInsets = YALTabBarViewHDefaultEdgeInsets;
    tabBarController.tabBarView.tabBarItemsEdgeInsets = YALTabBarViewItemsDefaultEdgeInsets;
    tabBarController.tabBarView.offsetForExtraTabBarItems = YALForExtraTabBarItemsDefaultOffset;

Swift

tabBarController.tabBarView.tabBarViewEdgeInsets = YALTabBarViewHDefaultEdgeInsets
tabBarController.tabBarView.tabBarItemsEdgeInsets = YALTabBarViewItemsDefaultEdgeInsets
tabBarController.tabBarView.offsetForExtraTabBarItems = YALForExtraTabBarItemsDefaultOffset

3. Specify colors

Objective-C

    tabBarController.tabBarView.backgroundColor = [UIColor colorWithRed:94.0/255.0 green:91.0/255.0 blue:149.0/255.0 alpha:1];
    tabBarController.tabBarView.tabBarColor = [UIColor colorWithRed:72.0/255.0 green:211.0/255.0 blue:178.0/255.0 alpha:1];
    tabBarController.tabBarView.dotColor = [UIColor colorWithRed:94.0/255.0 green:91.0/255.0 blue:149.0/255.0 alpha:1];

Swift

tabBarController.tabBarView.backgroundColor = UIColor(
                                                  red: 94.0/255.0,
                                                  green: 91.0/255.0,
                                                  blue: 149.0/255.0,
                                                  alpha: 1
                                              )

tabBarController.tabBarView.tabBarColor = UIColor(
                                              red: 72.0/255.0,
                                              green: 211.0/255.0,
                                              blue: 178.0/255.0,
                                              alpha: 1
                                          )

tabBarController.tabBarView.dotColor = UIColor(
                                           red: 94.0/255.0,
                                           green: 91.0/255.0,
                                           bl