FOLDING CELL

Expanding content cell with animation inspired by folding paper card material design.

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Requirements

• iOS 8.0+
• Xcode 10.2

Installation

Just add the FoldingCell.swift file to your project.

or use CocoaPods with Podfile:

pod 'FoldingCell'

or Carthage users can simply add Mantle to their Cartfile:

github "Ramotion/folding-cell"

or Swift Package Manager by adding:

dependencies: [
.package(url: "https://github.com/Ramotion/folding-cell.git", from: "5.0.2")
]

to Package.swift

or just drag and drop FoldingCell.swift file to your project

Solution

Usage

1. Create a new cell inheriting from FoldingCell

2. Add a UIView to your cell in your storyboard or nib file, inheriting from RotatedView. Connect the outlet from this view to the cell property foregroundView. Add constraints from this view to the superview, as in this picture:

(constants of constraints may be different). Connect the outlet from this top constraint to the cell property foregroundViewTop . (This view will be shown when the cell is in its normal state).

3. Add other UIViews to your cell, connect the outlet from this view to the cell property containerView. Add constraints from this view to the superview like in the picture:

(constants of constraints may be different). Connect the outlet from this top constraint to the cell property containerViewTop. (This view will be shown when the cell is opened)

Your result should be something like this picture:

4. Set @IBInspectable var itemCount: NSInteger property is a count of folding (it IBInspectable you can set in storyboard). range 2 or greater. Default value is 2

Ok, we've finished configuring the cell.

5. Adding code to your UITableViewController

5.1) Add constants:

fileprivate struct C {
  struct CellHeight {
    static let close: CGFloat = *** // equal or greater foregroundView height
    static let open: CGFloat = *** // equal or greater containerView height
  }
}

5.2) Add property for calculate cells height

     var cellHeights = (0..<CELLCOUNT).map { _ in C.CellHeight.close }

5.3) Override method:

    override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        return cellHeights[indexPath.row]
    }

5.4) Added code to method:

    override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
        guard case let cell as FoldingCell = tableView.cellForRowAtIndexPath(indexPath) else {
          return
        }

        var duration = 0.0
        if cellIsCollapsed {
            cellHeights[indexPath.row] = Const.openCellHeight
            cell.unfold(true, animated: true, completion: nil)
            duration = 0.5
        } else {
            cellHeights[indexPath.row] = Const.closeCellHeight
            cell.unfold(false, animated: true, completion: nil)
            duration = 0.8
        }

        UIView.animateWithDuration(duration, delay: 0, options: .CurveEaseOut, animations: { _ in
            tableView.beginUpdates()
            tableView.endUpdates()
        }, completion: nil)
    }

5.5) Control if the cell is open or closed

  override func tableView(tableView: UITableView, willDisplayCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath) {

        if case let cell as FoldingCell = cell {
            if cellHeights![indexPath.row] == C.cellHeights.close {
                foldingCell.selectedAnimation(false, animated: false, completion:nil)
            } else {
                foldingCell.selectedAnimation(true, animated: false, completion: nil)
            }
        }
    }

6. Add this code to your new cell class

    override func animationDuration(itemIndex:NSInteger, type:AnimationType)-> NSTimeInterval {

        // durations count equal it itemCount
        let durations = [0.33, 0.26, 0.26] // timing animation for each view
        return durations[itemIndex]
    }

if don't use storyboard and xib files

Create foregroundView and containerView from code (steps 2 - 3) look example: Folding-cell-programmatically

🗂 Check this library on other language:

📄 License

Folding cell is released under the MIT license. See LICENSE for details.

This library is a part of a selection of our best UI open-source projects.

If you use the open-source library in your project, please make sure to credit and backlink to www.ramotion.com

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