PeekPan

PeekPan combines 3D Touch and pan gestures to cycle through a collection of views while Peeking.

It’s possible to have a gesture recognizer track the user’s touch location while Peeking.
This just provides a way to travel through a range of indices with the mechanics figured out.

The main files used in this library are:

• PeekPanGestureRecognizer.swift:
  Begins tracking the user’s touch location once the Peek preview is displayed and ends once the touch is released.

• PeekPanCoordinator.swift:
  Correlates the user’s touch location to a range of indices within an adjustable panning area.

• PeekPanViewController.swift:
  A UIViewController used as an optional way to display different UIView on the Peek preview.

##Getting started via CocoaPods

sudo gem install cocoapods

Create a Podfile in your project directory:

pod init

Add the following to your Podfile project’s target:

pod 'PeekPan'

Then run CocoaPods with pod install.

Finally, include PeekPanCoordinator.swift, PeekPanGestureRecognizer.swift, and (optional) PeekPanViewController.swift in your project.
Make sure to include a bridging header that imports <UIKit/UIGestureRecognizerSubclass.h> for PeekPanGestureRecognizer.swift to build correctly.

The component is targeted for use with iOS 9 but can support iOS 8 and greater.

##How to setup

1. Initialize PeekPanCoordinator with a view controller’s view to add a gesture recognizer and set the bounds of the panning area.

2. Set the coordinator’s data source and have a return value for maximumIndex(for peekPanCoordinator: PeekPanCoordinator) -> Int. Also set the coordinator’s delegate and its methods to receive updates.

3. Call setup() or setup(at: index) in previewingContext(previewingContext:viewControllerForLocation:) to setup the coordinator at a particular index and retreive data from the data source.

4. Call end(true) in previewingContext(previewingContext:commitViewController:) to change the state of the coordinator and reset its values.

1. To use PeekPanViewController, setup the coordinator using the directions above and set its delegate to the view controller. Also set the coordinator’s data source to a class that follows its protocol.

2. Return a view to view(for peekPanViewController:atIndex:) -> UIView when there’s a change in index or view(for peekPanViewController:atPercentage:) -> UIView when the user’s touch location changes.
   PeekPanViewControllerDelegate is a subclass of PeekPanCoordinatorDelegate so all of the coordinator’s delegate methods are available to the view controller’s delegate.

####Additional References
PeekPan uses some images from Behance made by the following authors licensed under CC BY 4.0:

• Toros Köse - toroskose : “Iceland 2015”
• Hakob Minasian - HakobDesigns : “Concept Art Portfolio”
• Vivien Bertin - vivienbertin : “Line-up #3”
• Alberto Seveso - indiffident : “Quinteassential”