Example

To run the example project, clone the repo, and run pod install from the Example directory first.

Features

UGrid offers three different sizes for cells. Toggle between them and let UGridFlowLayout to hanlde the rest. All empty spaces will be used. UGridView is willing to be like Windows Phone home page grid view :)

Implementation

Just assign instance of UGridFlowLayout to your collection view's collectionViewLayout property and you're good to go:

import UIKit
import ugrid

class ViewController: UIViewController {
 
   private var _layout = UGridFlowLayout()
   private var _layoutType: LayoutType = .less
 
   override func viewDidLoad() {
      super.viewDidLoad()

      collectionView.collectionViewLayout = _layout
   }
}

Toggle between Layout Types

There is two Layout Types: less or more

With less type in one row there will be:

• 4 small grid items
• 2 middle grid items
• 1 big grid item and there won't be any space for any other grid item

With more type in one row there will be:

• 6 small grid items
• 3 middle grid items
• 1 big grid item, but there will be a space for 4 small grid items or 1 middle item in the smae row

Layout Types could be toggled by calling setType(_:) and passing spacific Layout Type:

...
   override func viewDidLoad() {
      ...
      
      _layoutType.toggle()
      
      _layout.setType(_layoutType)
      
      ...
   }
...

Toggle between sizes

Just call toggleSize(forIndexPath:) On UGridFlowLayout instance. Layout will automaticall toggle between small, middle and big sizes:

...
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        _layout.toggleSize(forIndexPath: indexPath)
    }
...

If there isn't any size info in the store for the item yet by default small size will be used. You can change default size by calling setDefaultGridSize(_ size: SizeType) on UGridFlowLayout instance:

...
   override func viewDidLoad() {
      ...
      
      _layout.setDefaultGridSize(.middle)
      
      ...
   }
...

After this every new added item will have middle size instead of default small.

Store changes

For simplicity UserDefaults is used to save size for each cell index path. If you still want to handle storing yourself You want to check Change behaviour section

If you want to clear all saved item sizes call resetItemsSizes() on UGridFlowLayout instance:

...
   override func viewDidLoad() {
      ...
      
      _layout.resetItemsSizes()
      
      ...
   }
...

Change behaviour

UGrid is still in development. It do it's best to bring the fastest calculation time for reordering cells, simplest implementation and usability. Though if you have a better calculation idea (which is most likely) you can create your own calculation class by simply adopting to IGridCalculation protocol and use setCalculationLogic(_:) on UGridFlowLayout instance to change calculation logic. Also if you like to store sizes on your own, you can adopt to IGridSizeRepository protocol and set new storing mechanism by calling setSizeRepository(_:) on on UGridFlowLayout instance.

To change grid items count in one row, simply create a class that comforms to IGridItemsInRow and set it to UGridFlowLayout instance. For exmaple, to have 3 items in one row for less mode instead of default 4, create a new class called CustomSizeCountInrow:

class CustomSizeCountInrow: IGridItemsInRow {
    func itemsInRow(forSizeType size: SizeType, andLayoutType layout: LayoutType) -> CGFloat {

        switch layout {
        case .less:
            switch size {
            case .small:
                return 3
            case .middle:
                return 1.5
            case .big:
                return 1
            }
        case .more:
            switch size {
            case .small:
                return 6
            case .middle:
                return 3
            case .big:
                return 1
            }
        }
    }
}

and set it:

...
   override func viewDidLoad() {
      ...
            
      _layout.setGridItemsInRow(CustomSizeCountInrow())
      
      ...
   }
...

What is planned to be done

• Section support. Currently only one section is supported
• Drag and Drop support

Requirements

• XCode 11+
• iOS 11+

Installation

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

pod 'ugrid'

Author

Bug Creator

License

ugrid is available under the MIT license. See the LICENSE file for more info.