ELTabScrollController: Easily Used Tab Scroll ViewController build with Swift 4

• **:warning: ELTabScrollController requires Swift Version as 4.X

• ⚠️ ELTabScrollController requires iOS Version higher than 9.0. (95% of iOS devices are higher than 9.0)

中文说明

Screenshots

Easily Used Tab Scroll ViewController build with Swift 4

How to Install

Using CocoaPods

• Add this line to your podfile : pod 'ELTabScrollController'
• Swift 3.* use 3.0.0 pod version
• Swift 4.* use 4.* pod version
• Run pod install with Terminal
• Then everything is done!

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Simply add

• Open Elenionl/ELTabScrollController with browser
• Download or Clone Project: https://github.com/Elenionl/ELTabScrollController.git
• Copy ELCustomPickerView.swift UIKit+EL.swift file to your project
• Enjoy

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How to Use

If you want to show a Tab Scroll ViewController in your application. Simply do these two steps:

• init

class TabScrollController: ELTabScrollController {
    // MARK: - LifeCircle
    init() {
        super.init()
    }

Or spicify width and type

class TabScrollController: ELTabScrollController {
    // MARK: - LifeCircle
    init() {
        super.init(width: 200, type: .equal_scrollable)
    }

• add Items, who is authorized to manage a button and button's associating viewController (including view).

override func viewDidLoad() {
  super.viewDidLoad()
  let ctrl1 = ViewController(nibName: nil, bundle: nil)
  let ctrl2 = ViewController(nibName: nil, bundle: nil)
  let ctrl3 = ViewController(nibName: nil, bundle: nil)
  let ctrl4 = ViewController(nibName: nil, bundle: nil)
  let item1 = ELTabScrollItem(title: "Tab 1", image: nil, viewController: ctrl1, view: nil)
  let item2 = ELTabScrollItem(title: "Tab 2", image: nil, viewController: ctrl2, view: nil)
  let item3 = ELTabScrollItem(title: "Tab 3", image: nil, viewController: ctrl3, view: nil)
  let item4 = ELTabScrollItem(title: "Tab 4", image: nil, viewController: ctrl4, view: nil)
  items = [item1, item2, item3, item4]
}

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ELTabScrollController Types

There are four types:

• equal_unscrollable
• equal_scrollable
• unequal_unscrollable
• unequal_scrollable

equal means all buttons width is equal

unequal means button width is relevant with its contentSize

unscrollable means the width of tab is equal to ELTabScrollController.width

scrollable means the width of tab can be bigger than width of ELTabScrollController. And tab is scrollable

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If You Want to Use Other View of the Child ViewController

    let ctrl1 = ViewController(nibName: nil, bundle: nil)
    let item1 = ELTabScrollItem(title: "Tab 1", image: nil, viewController: ctrl1, view: ctrl1.tableView)

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Handler Triggered by Switch

• Get notified when the pages switch

self.switchHandler = { (index, type) in
    print(index, type)
}

• The Log is like follow:

2 buttonTap
2 buttonTap
3 buttonTap
1 buttonTap
1 buttonTap
0 scroll
0 scroll
1 scroll

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Button Can Be Customized

⚠️ ELTabScrollItem.button has lower priority compared with ELTabScrollController.buttonSelectedBackgroudColor etc.

• Button with title and image

let item4 = ELTabScrollItem(title: "Tab 4", image: UIImage(named: "image"), viewController: ctrl4, view: nil)

• Custom button by your self

public init(button: UIButton, viewController: UIViewController, view: UIView?)

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ViewController is Easily Customizable

⚠️ Settings are expected in viewDidLoad. Or will cause exception

override func viewDidLoad() {
  super.viewDidLoad()
  self.title = "Demo"
  tab.backgroundColor = UIColor.orange
  sliderView.backgroundColor = .white
  container.backgroundColor = UIColor.lightGray
  tabButtonHeight = 66
  sliderViewHeight = 10
  buttonFont = UIFont.boldSystemFont(ofSize: 18)
  buttonSelectedTitleColor = UIColor.white
  buttonNormalTitleColor = UIColor.lightGray
  switchHandler = { (index, type) in
    print(index, type)
  }
}

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Settings and Handlers Available

// MARK: - Settings

open var tabBarType: ELTabBarType = ELTabBarType.equal_unscrollable

/// Distance between buttons. Default value: 30.0 for scrollable, 0 for unscrollable.
open var tabSpacing: CGFloat

/// The zoom factor for buttons, only available in scrollable tabs. Default value: 1.05
open var buttonHorizontalZoomFactor: CGFloat = 1.05

/// Items containing buttons and viewControllers
open var items: [ELTabScrollItem]! = []

/// The width of the base view. Default value is screen width
open var width: CGFloat! = UIScreen.main.bounds.size.width

/// Triggered by switch behavior
open var switchHandler: ELSwitchHandler?

/// Height of button
open var tabButtonHeight: CGFloat = 44

/// Hight of slider
open var sliderViewHeight: CGFloat = 5

/// Font of button
open var buttonFont: UIFont?

open var buttonSelectedBackgroudColor: UIColor?

open var buttonNormalBackgroudColor: UIColor?

open var buttonSelectedTitleColor: UIColor?

open var buttonNormalTitleColor: UIColor?

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Requirements

• Xcode 8.X
• Swift 4.X
• Using ARC
• iOS 9.0

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TODO

• ✅ More Tab Style
• ❎ More Slider Style

Author

Hanping Xu (Elenionl), stellanxu@gmail.com

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License

ELTabScrollController is available under the MIT license, see the LICENSE file for more information.