TabBarController

Fully customizable tabbar controller.

Features

• Cusom tabbar view. No limitations.
• Standart UIViewController lifecycle for child controllers.
• Preserve child controllers across selection.
• Hide/Show tabbar view.
• Cocoa-like API. UIKit support.

Usage

1. Create custom tabbar view

class MyTabBarView: UIView { 
    // Should be called on every selected tab change.
    var onItemSelect: (Int) -> Void

    // Current selected tab index.
    var selectedIndex: Int

    // Layout tab bar view items.
}

Note: Above provided one of possible API. You are not limited to use delegate or other patterns.

2. Create custom tabbar controller

import TabBarController

class MyTabBarController: TabBarController {
    // Provide your root controllers.
    override var controllers: [UIViewController] { myChildControllers }

    // Provide your tabbar view.
    override var tabBarView: UIView { myTabBarView }
    
    override func viewDidLoad() {
        super.viewDidLoad()

        view.addSubview(myTabBarView)
        // Add contraints for tabbar view or layout it other way.

        // Show corresponding child controller on tabbar view selection change.
        myTabBarView.onItemSelect = { [weak self] selectedIndex in
            self?.selectedIndex = seelctedIndex
        }
    }

    // Update tabbar view state on programmatically selected tab chage.
    override func selectedIndexDidChange() {
        super.selectedIndexDidChange()

        myTabBarView.selectedIndex = selectedIndex
    }
}

3. Use MyTabBarController as default tabbar controller.

let controller = MyTabBarController()
controller.myChildControllers = [...]

window?.rootViewContoller = controller

4. (Optional, but handy) To make MyTabBarContoller accessible from every UIViewController just like default UITabBarController:

extension UIViewController {
    var myTabBarController: MyTabBarController? {
        findParent(type: MyTabBarController.self)
    }
}

So from any view controller:

myTabBarController.setTabBarVisibility(isHidden: true)

Implementation Details

The implementation is super lightweight. TabBarController inherits UIViewController and doesn't use UITabBarController under the hood.

Requirements

• Swift 5.0
• iOS 15.0

Installation

SPM

dependencies: [
    .package(
        url: "https://github.com/MobileUpLLC/TabBarController",
        .upToNextMajor(from: "1.0.0")
    )
]

License

TabBarController is destributed under the MIT license.