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https://github.com/xmartlabs/XLPagerTabStrip

Android PagerTabStrip for iOS.
https://github.com/xmartlabs/XLPagerTabStrip

carthage cocoapods ios-libraries ios-ui pager-controller swift swift-library

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Android PagerTabStrip for iOS.

Lists

README 

        
![XLPagerTabStripView](https://raw.githubusercontent.com/xmartlabs/XLPagerTabStrip/master/XLPagerTabTrip.png)





Build status

Platform iOS

Swift 5 compatible

Carthage compatible

CocoaPods compatible

License: MIT







Made with ❤️ by [XMARTLABS](http://xmartlabs.com).



Android [PagerTabStrip](http://developer.android.com/reference/android/support/v4/view/PagerTabStrip.html) for iOS!



👉 Looking for a SwiftUI version? Check out [PagerTabStripView](https://github.com/xmartlabs/PagerTabStripView), it's fully written in pure SwiftUI. 👈



**XLPagerTabStrip** is a *Container View Controller* that allows us to switch easily among a collection of view controllers. Pan gesture can be used to move on to next or previous view controller. It shows a interactive indicator of the current, previous, next child view controllers.



  

    

    

    

    

  



## Getting involved



* If you **want to contribute** please feel free to **submit pull requests**.

* If you **have a feature request** please **open an issue**.

* If you **found a bug** or **need help** please **check older issues, [FAQ](#faq) and threads on [StackOverflow](http://stackoverflow.com/questions/tagged/XLPagerTabStrip) (Tag 'XLPagerTabStrip') before submitting an issue**.



**Before contribute check the [CONTRIBUTING](CONTRIBUTING.md) file for more info.**



If you use **XLPagerTabStrip** in your app we would love to hear about it! Drop us a line on [twitter](https://twitter.com/xmartlabs).



## Pager Types



The library provides 4 different ways to show the view controllers.



### Button Bar



This is likely the most common pager type. It's used by many well-known apps such as instagram, youtube, skype, and many others.






### Bar



This mode doesn't show a title neither an image. It only shows a bar that indicates the current view controller.






### Twitter



A long time ago, the twitter app made use of this type of pager in the app main screen.






### Segmented



This mode uses a `UISegmentedControl` to indicate which view controller is being displayed.






## Usage



Basically, we just need to provide the list of child view controllers to show, and these view controllers should provide the information (title or image) that will be shown in the associated indicator.



Let's see the steps to do this:



##### Choose which type of pager we want to create



First, we must choose the type of pager we want to create.  Depending on our choice, we will have to create a view controller that extends from one of the following controllers: `TwitterPagerTabStripViewController`, `ButtonBarPagerTabStripViewController`, `SegmentedPagerTabStripViewController`, `BarPagerTabStripViewController`.



> All these built-in pager controllers extend from the base class `PagerTabStripViewController`.

> You can also make your custom pager controller by extending directly from `PagerTabStripViewController` in the event that no pager menu type fits your needs.



```swift

import XLPagerTabStrip



class MyPagerTabStripName: ButtonBarPagerTabStripViewController {

  ..

}

```



##### Connect outlets and add layout constraints



We strongly recommend using IB to set up our page controller views.



Drag a `UIViewController` into the storyboard and set up its class with your pager controller (`MyPagerTabStripName`).

Drag a `UIScrollView` into your view controller view and connect `PagerTabStripViewController` `containerView` outlet with the scroll view.



Depending on which type of paging view controller you are working with you may have to connect more outlets.



For `BarPagerTabStripViewController`, we should connect `barView` outlet. barView type is UIView. `ButtonBarPagerTabStripViewController` requires us to connect `buttonBarView` outlet. `buttonBarView` type is `ButtonBarView` which extends from `UICollectionView`. `SegmentedPagerTabStripViewController` has a `segmentedControl` outlet; if the outlet is not connected the library try to set up the navigationItem `titleView` property using a `UISegmentedControl`. `TwitterPagerTabStripViewController` doesn't require us to connect any additional outlet.



> The example project contains a example for each pager controller type and we can look into it to see how views were added and how outlets were connected.



##### Provide the view controllers that will appear embedded into the PagerTabStrip view controller



You can provide the view controllers by overriding `func viewControllers(for: pagerTabStripController: PagerTabStripViewController) -> [UIViewController]` method.



```swift

override public func viewControllers(for pagerTabStripController: PagerTabStripViewController) -> [UIViewController] {

  return [MyEmbeddedViewController(), MySecondEmbeddedViewController()]

}

```



> The method above is the only method declared in `PagerTabStripDataSource` protocol. We don't need to explicitly conform to it since base pager class already does it.



##### Provide information to show in each indicator



Every UIViewController that will appear within the PagerTabStrip needs to provide either a title or an image.

In order to do so they should conform to `IndicatorInfoProvider` by implementing `func indicatorInfo(for pagerTabStripController: PagerTabStripViewController) -> IndicatorInfo`

 which provides the information required to show the PagerTabStrip menu (indicator) associated with the view controller.



```swift

class MyEmbeddedViewController: UITableViewController, IndicatorInfoProvider {



  func indicatorInfo(for pagerTabStripController: PagerTabStripViewController) -> IndicatorInfo {

    return IndicatorInfo(title: "My Child title")

  }

}

```



**For a detailed step-by-step guide about how to use the library, please check out this community [blog post](https://medium.com/michaeladeyeri/how-to-implement-android-like-tab-layouts-in-ios-using-swift-3-578516c3aa9).**



That's it! We're done! 🍻🍻



## Customization



##### Pager Behaviour



The pager indicator can be updated progressive as we swipe or at once in the middle of the transition between the view controllers.

By setting up `pagerBehaviour` property we can choose how the indicator should be updated.



```swift

public var pagerBehaviour: PagerTabStripBehaviour

```



```swift

public enum PagerTabStripBehaviour {

    case common(skipIntermediteViewControllers: Bool)

    case progressive(skipIntermediteViewControllers: Bool, elasticIndicatorLimit: Bool)

}

```



Default Values:

```swift

// Twitter Type

PagerTabStripBehaviour.common(skipIntermediateViewControllers: true)

// Segmented Type

PagerTabStripBehaviour.common(skipIntermediateViewControllers: true)

// Bar Type

PagerTabStripBehaviour.progressive(skipIntermediateViewControllers: true, elasticIndicatorLimit: true)

// ButtonBar Type

PagerTabStripBehaviour.progressive(skipIntermediateViewControllers: true, elasticIndicatorLimit: true)

```



As you might have noticed, `common` and `progressive` enumeration cases have `skipIntermediateViewControllers` and `elasticIndicatorLimit` associated values.



`skipIntermediateViewControllers` allows us to skip intermediate view controllers when a tab indicator is tapped.



`elasticIndicatorLimit` allows us to tension the indicator when we reach a limit, I mean when we try to move forward from last indicator or move back from first indicator.



##### PagerTabStripDelegate & PagerTabStripIsProgressiveDelegate



Normally we don't need to implement these protocols because each pager type already conforms to it in order to properly update its indicator. However, there may be some scenarios when overriding a method may come in handy.



```swift

public protocol PagerTabStripDelegate: class {



    func updateIndicator(for viewController: PagerTabStripViewController, fromIndex: Int, toIndex: Int)

}



public protocol PagerTabStripIsProgressiveDelegate : PagerTabStripDelegate {



    func updateIndicator(for viewController: PagerTabStripViewController, fromIndex: Int, toIndex: Int, withProgressPercentage progressPercentage: CGFloat, indexWasChanged: Bool)

}

```



> Again, the method invoked by the library depends on the `pagerBehaviour` value.



### ButtonBar Customization



```swift



settings.style.buttonBarBackgroundColor: UIColor?

// buttonBar minimumInteritemSpacing value, note that button bar extends from UICollectionView

settings.style.buttonBarMinimumInteritemSpacing: CGFloat?

// buttonBar minimumLineSpacing value

settings.style.buttonBarMinimumLineSpacing: CGFloat?

// buttonBar flow layout left content inset value

settings.style.buttonBarLeftContentInset: CGFloat?

// buttonBar flow layout right content inset value

settings.style.buttonBarRightContentInset: CGFloat?



// selected bar view is created programmatically so it's important to set up the following 2 properties properly

settings.style.selectedBarBackgroundColor = UIColor.black

settings.style.selectedBarHeight: CGFloat = 5



// each buttonBar item is a UICollectionView cell of type ButtonBarViewCell

settings.style.buttonBarItemBackgroundColor: UIColor?

settings.style.buttonBarItemFont = UIFont.systemFont(ofSize: 18)

// helps to determine the cell width, it represent the space before and after the title label

settings.style.buttonBarItemLeftRightMargin: CGFloat = 8

settings.style.buttonBarItemTitleColor: UIColor?

// in case the barView items do not fill the screen width this property stretch the cells to fill the screen

settings.style.buttonBarItemsShouldFillAvailableWidth = true

// only used if button bar is created programmatically and not using storyboards or nib files as recommended.

public var buttonBarHeight: CGFloat?

```



**Important:** Settings should be called before `viewDidLoad` is called.

```swift

override func viewDidLoad() {

   self.settings.style.selectedBarHeight = 2

   self.settings.style.selectedBarBackgroundColor = UIColor.white



   super.viewDidLoad()

}

```



#####  Update cells when selected indicator changes



We may need to update the indicator cell when the displayed view controller changes. The following function properties help to accomplish that. Depending on our pager `pagerBehaviour` value we will have to set up `changeCurrentIndex` or `changeCurrentIndexProgressive`.



```swift

public var changeCurrentIndex: ((oldCell: ButtonBarViewCell?, newCell: ButtonBarViewCell?, animated: Bool) -> Void)?

public var changeCurrentIndexProgressive: ((oldCell: ButtonBarViewCell?, newCell: ButtonBarViewCell?, progressPercentage: CGFloat, changeCurrentIndex: Bool, animated: Bool) -> Void)?

```



Let's see an example:



```swift

changeCurrentIndexProgressive = { (oldCell: ButtonBarViewCell?, newCell: ButtonBarViewCell?, progressPercentage: CGFloat, changeCurrentIndex: Bool, animated: Bool) -> Void in

    guard changeCurrentIndex == true else { return }



    oldCell?.label.textColor = UIColor(white: 1, alpha: 0.6)

    newCell?.label.textColor = UIColor.white



    if animated {

        UIView.animate(withDuration: 0.1, animations: { () -> Void in

            newCell?.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)

            oldCell?.transform = CGAffineTransform(scaleX: 0.8, y: 0.8)

        })

    }

    else {

        newCell?.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)

        oldCell?.transform = CGAffineTransform(scaleX: 0.8, y: 0.8)

    }

}

```



### Bar Type Customization



```swift

settings.style.barBackgroundColor: UIColor?

settings.style.selectedBarBackgroundColor: UIColor?

// barHeight is only set up when the bar is created programmatically and not using storyboards or xib files as recommended.

settings.style.barHeight: CGFloat = 5

```



### Twitter Type Customization



```swift

settings.style.dotColor = UIColor(white: 1, alpha: 0.4)

settings.style.selectedDotColor = UIColor.white

settings.style.portraitTitleFont = UIFont.systemFont(ofSize: 18)

settings.style.landscapeTitleFont = UIFont.systemFont(ofSize: 15)

settings.style.titleColor = UIColor.white

```



### Segmented Type Customization



```swift

settings.style.segmentedControlColor: UIColor?

```



## Requirements



* iOS 9.3+

* Xcode 10.2+



## Examples



Follow these 3 steps to run Example project: Clone XLPagerTabStrip repository, open XLPagerTabStrip workspace and run the *Example* project.



## Installation



### CocoaPods



[CocoaPods](https://cocoapods.org/) is a dependency manager for Cocoa projects.



To install XLPagerTabStrip, simply add the following line to your Podfile:



```ruby

pod 'XLPagerTabStrip', '~> 9.0'

```



### Carthage



[Carthage](https://github.com/Carthage/Carthage) is a simple, decentralized dependency manager for Cocoa.



To install XLPagerTabStrip, simply add the following line to your Cartfile:



```ogdl

github "xmartlabs/XLPagerTabStrip" ~> 9.0

```



### SPM



- File > Swift Packages > Add Package Dependency

- Add `https://github.com/xmartlabs/XLPagerTabStrip.git`

- Select "Up to Next Major" with "9.0.0"



## FAQ



#### How to change the visible child view controller programmatically



`PagerTabStripViewController` provides the following methods to programmatically change the visible child view controller:



```swift

func moveToViewController(at index: Int)

func moveToViewController(at index: Int, animated: Bool)

func moveTo(viewController: UIViewController)

func moveTo(viewController: UIViewController, animated: Bool)

```



#### How to migrate from Swift 2 to Swift 3 



Check out [our migration guide](https://github.com/xmartlabs/XLPagerTabStrip/blob/master/Migration.md)



## Author



* [Martin Barreto](https://github.com/mtnBarreto) ([@mtnBarreto](https://twitter.com/mtnBarreto))



## Change Log



This can be found in the [CHANGELOG.md](CHANGELOG.md) file.