Code Quality Rank: L5
Programming language: Swift
License: MIT License
Tags: UI     Tab Bar    
Latest version: v3.0.1

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⭐️ Features

  • Easy to implement page view controller with interactive indicator bars.
  • Highly adaptable and powerful customization.
  • Fully extensible with mix-and-match component library.
  • Built on Pageboy, a simple, informative page view controller.
  • Automatically insets child view controller contents.

📋 Requirements

Tabman requires iOS 11 or above; and is compatibile with Swift 5.

📲 Installation

Swift Package Manager

Tabman is compatible with Swift Package Manager and can be integrated via Xcode.


Tabman is also available through CocoaPods:

pod 'Tabman', '~> 3.0'


Tabman is also available through Carthage:

github "uias/Tabman" ~> 3.0

🚀 Usage

The Basics

1) Set up your view controller with the an array of view controllers that you want to appear. 2) Set the PageboyViewControllerDataSource data source of the TabmanViewController. 3) Create, customize and add as many TMBars as you want.

import Tabman
import Pageboy

class TabViewController: TabmanViewController {

    private var viewControllers = [UIViewController(), UIViewController()]

    override func viewDidLoad() {

        self.dataSource = self

        // Create bar
        let bar = TMBar.ButtonBar()
        bar.layout.transitionStyle = .snap // Customize

        // Add to view
        addBar(bar, dataSource: self, at: .top)

When adding a bar, you can choose to add it to the predefined areas (.top, .bottom, .navigationItem(item:)) or to a custom view with .custom(view:layout:). For more information, read the Adding a Bar guide.

4) Configure your data sources.

extension TabViewController: PageboyViewControllerDataSource, TMBarDataSource {

    func numberOfViewControllers(in pageboyViewController: PageboyViewController) -> Int {
        return viewControllers.count

    func viewController(for pageboyViewController: PageboyViewController,
                        at index: PageboyViewController.PageIndex) -> UIViewController? {
        return viewControllers[index]

    func defaultPage(for pageboyViewController: PageboyViewController) -> PageboyViewController.Page? {
        return nil

    func barItem(for bar: TMBar, at index: Int) -> TMBarItemable {
        let title = "Page \(index)"
        return TMBarItem(title: title)

Bar Items

A bar will ask for a TMBarItemable for each page that is provided to the TabmanViewController dataSource. TMBarItemable is a protocol that can be used for custom item types, the default in Tabman being TMBarItem:

let item = TMBarItem()
item.title = "Item 1"
item.image = UIImage(named: "item.png")
item.badgeValue = "New"
UIKit Itemables

Tabman also provides support for some native UIKit types as TMBarItemable:

  • UINavigationItem
  • UITabBarItem

These types are unfortunately unable to support the dynamic updating of the bar when setting properties.

Choosing a look

Tabman provides numerous, easy to use template styles out of the box:


These are all available as types of TMBar in TMBar+Templates.

let bar = TMBar.ButtonBar()
let tabBar = TMBar.TabBar()


Bar customization is available via properties on each functional area of the bar. Each bar is made up of 4 distinct areas:



TMBarView is the root view of every bar, and provides the glue for meshing all the other functional areas together. You can change a few things here, such as background style and transitioning behavior.

bar.background.style = .blur(style: .extraLight)
bar.transitionStyle = .snap

This is also the entry point for all other customization.

🧲 Properties of Interest
  • backgroundView - TMBarBackgroundView which provides background styling.
  • scrollMode - What type of interactive scrolling to allow.
  • fadesContentEdges - Whether to fade the edges of the bar contents as it goes off-screen.

More: TMBarView Docs


TMBarLayout is the foundation of a TMBarView, dictating how bar buttons are displayed and laid out. Look here if you want to change things such as button spacing, content insets and other layout'y things.

bar.layout.contentInset = UIEdgeInsets(top: 0.0, left: 20.0, bottom: 0.0, right: 20.0)
🧲 Properties of Interest
  • contentMode - How the layout should display its contents; either restricted to the bar width with .fit or intrinsically sized with .intrinsic.
  • contentInset - Inset to be applied to the edges of the layout.
  • transitionStyle - How the layout should perform transition animations.
  • alignment - How the layout should be aligned in the bar.

More: TMBarLayout Docs


TMBarButton views are populated in the TMBarLayout and correspond to the items provided by the data source. This is the place to change things like fonts, image sizing and highlight colors.

As you will most likely dealing with more than one button, you can modify the whole set at once:

bar.buttons.customize { (button) in
    button.tintColor = .orange
    button.selectedTintColor = .red

This will be applied to both existing bar buttons and any that are added to the bar afterwards.

🧲 Properties of Interest
  • backgroundView - TMBarBackgroundView which provides background styling.
  • contentInset - Inset to be applied to the edges of the button.
  • transitionStyle (TMBarButtonCollection) - How the buttons should should perform transition animations.
  • badge - TMBadgeView that displays badgeValue from bar item.

More: TMBarButton Docs


Lastly is TMBarIndicator - which indicates the current page index status for the bar. You can change behavior characteristics here as well as how the indicator looks.

bar.indicator.overscrollBehavior = .compress
bar.indicator.weight = .heavy
🧲 Properties of Interest
  • overscrollBehavior - How the indicator should handle scrolling beyond the bounds of the bar items.
  • isProgressive - Whether the indicator should act progressively when transitioning through page indexes.
  • transitionStyle - How the indicator should should perform transition animations.

More: TMBarIndicator Docs

🎨 Advanced Customization

Tabman provides the complete freedom to mix-and-match the built-in components; and also define your own.

TMBarView leverages generics to define and serve the three distinct functional areas of the bar. This means...

// ...that the preset...
let bar = Bar.ButtonBar()

// ...is actually under the hood:
let bar = BarView<HorizontalBarLayout, LabelBarButton, LineBarIndicator>

So swapping in another type of layout, button or indicator could not be simpler.

Lets say you wanted to actually use a DotBarIndicator rather than the LineBarIndicator:

let bar = BarView<HorizontalBarLayout, LabelBarButton, DotBarIndicator>

The following components are available in Tabman:

Bar Layouts
  • TMHorizontalBarLayout - Layout that displays bar buttons sequentially along the horizontal axis.
  • TMConstrainedHorizontalBarLayout - Layout that displays bar buttons sequentially along the horizontal axis, but is constrained by the number of items it can display.
Bar Buttons
  • TMLabelBarButton - Button which contains a single text label.
  • TMTabItemBarButton - Button which mimics appearance of a UITabBarItem, containing a image and label vertically aligned.
  • TMBarButton.None - Display no visible bar buttons.
Bar Indicators
  • TMLineBarIndicator - Simple indicator that displays as a horizontal line.
  • TMChevronBarIndicator - Indicator that displays a vertical chevron centered along the X-axis.
  • TMBlockBarIndicator - Indicator that fills the bar, displaying a solid color.
  • TMDotBarIndicator - Indicator that displays a circular dot centered along the X-axis.
  • TMBarIndicator.None - Display no visible indicator.

Going Completely Custom

As replacing the type of layout, button or indicator is as easy as above; you have the ability to define your own subclasses without too much of a headache.

Custom Tabman Components

There are also example projects that showcase custom layouts and such:

  • Tinderbar - Tinder iOS app layout built with Tabman.

📐 Content Insetting

Tabman automatically adjusts any content in its child view controllers so that it displays correctly beneath any visible bars. It provides the following behaviors:

  • Updates contentInset and contentOffset appropriately for any UIScrollView or derived subclass found in the child view controller's subviews.
  • Sets additionalSafeAreaInsets to reflect the required safe areas including the bar contents. Any views constrained to the safe area in the child view controller will be laid out correctly (Only available in iOS 11 and above.)

TabmanViewController also provides barLayoutGuide, a UILayoutGuide that provides top and bottom anchors taking into account any bars added to the .top or .bottom TabmanViewController.BarLocation areas. The raw UIEdgeInsets are also available via .barInsets.

Auto insetting can be disabled by setting automaticallyAdjustsChildInsets to false - however this must be done before viewDidLoad.

Tabman will not provide any insetting behavior for bars that are added to custom views.

⚠️ Troubleshooting

If you are encountering issues with Tabman, please check out the Troubleshooting Guide.

If you're still having problems, feel free to raise an issue.

👨🏻‍💻 About

❤️ Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/uias/Tabman.

👮🏻‍♂️ License

The library is available as open source under the terms of the MIT License.

*Note that all licence references and agreements mentioned in the Tabman README section above are relevant to that project's source code only.