SlidingTabBar

A custom TabBar view with sliding animation written in Swift. Inspired by this dribble.

Also, read how it was done on my blog - part 1, part 2.

Requirements

• iOS 8.0+
• Xcode 7.2+
• Swift 2+

Installation

SlidingTabBar is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod "SlidingTabBar"

Usage

First create your UITabBarViewController class and import SlidingTabBar:

import SlidingTabBar

Make it adopt SlidingTabBarDataSource, SlidingTabBarDelegate and UITabBarControllerDelegate protocols:

class YourViewController: UITabBarController, SlidingTabBarDataSource, SlidingTabBarDelegate, UITabBarControllerDelegate

In viewDidLoad() set default UITabBar as hidden, set selectedIndex as you need and set the delegate.

self.tabBar.hidden = true
self.selectedIndex = 1
self.delegate = self

Create class variables:
var tabBarView: SlidingTabBar!
var fromIndex: Int!
var toIndex: Int!

Now initialize tabBarView in viewDidLoad():

// use default UITabBar's frame or whatever you want
// number of selectedTabBarItemColors has to match number of your tab bar items

tabBarView = SlidingTabBar(frame: self.tabBar.frame, initialTabBarItemIndex: self.selectedIndex)
tabBarView.tabBarBackgroundColor = UIColor.black()
tabBarView.tabBarItemTintColor = UIColor.gray()
tabBarView.selectedTabBarItemTintColor = UIColor.white()
tabBarView.selectedTabBarItemColors = [UIColor.red(), UIColor.green(), UIColor.blue()]
tabBarView.slideAnimationDuration = 0.6
tabBarView.datasource = self
tabBarView.delegate = self
tabBarView.setup()

self.view.addSubview(tabBarView)

And implement those delegate and datasource methods:

// MARK: - SlidingTabBarDataSource
    
func tabBarItemsInSlidingTabBar(tabBarView: SlidingTabBar) -> [UITabBarItem] {
    return tabBar.items!
}
    
// MARK: - SlidingTabBarDelegate
    
func didSelectViewController(tabBarView: SlidingTabBar, atIndex index: Int, from: Int) {
    self.fromIndex = from
    self.toIndex = index
    self.selectedIndex = index
}
    
// MARK: - UITabBarControllerDelegate
    
func tabBarController(tabBarController: UITabBarController, animationControllerForTransitionFromViewController fromVC: UIViewController, toViewController toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
    
    // use same duration as for tabBarView.slideAnimationDuration
    // you can choose direction in which view controllers should be changed:
    // - .Both(default),
    // - .Reverse,
    // - .Left,
    // - .Right 
    return SlidingTabAnimatedTransitioning(transitionDuration: 0.6, direction: .Both,
     fromIndex: self.fromIndex, toIndex: self.toIndex)
}

Finally set things up in the Storyboard:

1. Add native UITabBarController to the storyboard, establish relationships with its view controllers.
2. Choose YourViewController as custom class for UITabBarController.
3. Set images for all tab bar items:

If you're implementing 3d touch - Home Screen Quick Actions, add this to AppDelegate:

func application(application: UIApplication, performActionForShortcutItem shortcutItem: UIApplicationShortcutItem, completionHandler: (Bool) -> Void) {
	
    // whatever type you have
    if shortcutItem.type == UIApplicationShortcutItem.type { 
        let tabBarController = (window?.rootViewController as! YourViewController)
        tabBarController.selectedIndex = 1 // whatever view controller you need
        tabBarController.tabBarView.initialTabBarItemIndex = tabBarController.selectedIndex
        tabBarController.tabBarView.reloadTabBarView()
            
        completionHandler(true)
    }
        
    completionHandler(false)
}

Enjoy! :)

Author

Adam Bardon, bardon.adam@gmail.com, @bardonadam

License

SlidingTabBar is available under the MIT license. See the LICENSE file for more info.