UZDragSortController

UZDragSortController is a very easy-to-use tool that make your UICollectionView support drag sort behavior on iOS 8 or earlier. You just need to set a property and all things are ready to go!

Screenshot

Installation

This is a one-file library, just add the UZDragSortController.swift file to your project.

Usage

First, declare an ivar in your view controller:

var dragSortController: UZDragSortController?

Second, in your viewDidLoad() function, put these codes:

self.dragSortController = UZDragSortController()
self.dragSortController?.collectionView = self.collectionView
self.dragSortController?.delegate = self

And next, you need to implement the UZDragSortControllerDelegate protocol, there are four function:

• func dragSortController(controller: UZDragSortController, moveItemFromIndexPath fromIndexPath: NSIndexPath, toIndexPath: NSIndexPath) -> Bool: move your data in model, if this action cannot be performed, return false, otherwise, return true.

• func dragSortController(controller: UZDragSortController, canMoveItemAtIndexPath indexPath: NSIndexPath) -> Bool: return whether specific item can be moved.

• optional func dragSortController(controller: UZDragSortController, didBeginDragItemAtIndexPath indexPath: NSIndexPath): notify the delegate that controller did begin dragging.

• optional func dragSortController(controller: UZDragSortController, didEndDragItemAtFinalIndexPath indexPath: NSIndexPath): notify the delegate that controller did end dragging.

For detail usage, please refer to the sample project.

Customize

There are four properties can be changed:

• scrollVelocity: CGFloat: the velocity of auto scrolling.

• animationDuration: NSTimeInterval: general animation duration.

• snapshotOpacity: CGFloat: the opacity of snapshot view while dragging.

• snapshotScale: CGFloat: the scale of snapshot view while dragging.