Panel

Overview

Panel is a a simple, Snapchat inspired ViewController subclass. Panel allows you to add you own custom ViewControllers to an embedded ScrollView. Panel allows complete control over the presentaion of the panels.

Requirements

• iOS 8.0+
• Swift 3.0+

License

Panel is available under the BSD license. See the LICENSE file for more info.

Installation

Cocoapods:

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

pod "Panel"

Manual Installation:

Simply copy the contents of the Source folder into your project.

Usage

Using Panel is very simple.

Getting Started:

If you have installed via Cocoapods, be sure to include

import Panel

Create a View Controller, and set its subclass to be PanelViewController:

class MyViewController: PanelViewController {
    ...
    
}

Adding View Controllers:

To add your own ViewControllers, your container ViewController must conform to the PanelViewControllerDataSource protocol:

class MyViewController: PanelViewController, PanelViewControllerDataSource {   
    ...
    
}

The container ViewController must also set itself as the dataSource delegate in ViewDidLoad:

override func viewDidLoad() {
    super.viewDidLoad()
        
    // Datasource to set our ViewControllers
    dataSource = self
}

PanelViewControllerDataSource has one required protocol functions which must be implemented: PanelViewDidSetViewControllers(). PanelViewDidSetViewControllers() expects a return type of [UIViewController]. Panel requires three ViewControllers be returned in this array, in the order you wish to have them displayed:

func PanelViewDidSetViewControllers() -> [UIViewController] {
    
  // Add your own custom View Controllers here 
     
  	viewController1 = UIViewController()
    viewController2 = UIViewController()
    viewController3 = UIViewController()
        
    let panelArray = [viewController1, viewController2, viewController3]
        
    // Will be displayed in order: [LeftPanel, CenterPanel, RightPanel]
        
    return panelArray
}

Manually Moving to Panel

If you wish to animate to particular panel from inside your container ViewController, you can use the animateTo(panel:) function:

moveTo(panel: .left)

Additionally, if you wish to have one of the panel ViewControllers animate to another panel, you can use the PanelViewControllerDelegate property.

Within the panel ViewController's decleration, add a delegate property of optional type PanelViewControllerDelegate:

var delegate: PanelViewControllerDelegate?

When declaring the container ViewControllers dataSource, set the panel's delegate to the container ViewController:

func PanelViewDidSetViewControllers() -> [UIViewController] {
     
   viewController1 = CustomViewController()
     
   // set the ViewController's delegate to the 
   // container ViewController
   
   viewContoller1.delegate = self
        
    ...
}

Once the delegate is set, you can animate the panels by calling the delegate function PanelViewControllerAnimateTo(panel:):

delegate?.PanelViewControllerAnimateTo(panel: .left)

Miscellaneous

If you wish to know the position of the container ScrollView as it scrolls, you can implement the optional PanelViewControllerDataSource function PanelViewControllerDidScroll(offSet:). This will return the offSet CGFloat between -1.0 and 1.0:

func PanelViewControllerDidScroll(offSet: CGFloat) {
     // Offset is a float between -1.0 to 1.0 
     // depending on the position of ScrollView. 
     // -1.0 is centered on left panel
     // 0.0 is centered on central panel
     // 1.0 is centered on right panel
}

Contact

If you have any questions, requests, or enhancements, feel free to submit a pull request, create an issue, or contact me in person:

Andrew Walz - andrewjwalz@gmail.com