FlexibleCollectionViewController

CollectionView

October 9, 2023

Swift library of generic collection view controller with external data processing of functionality, like determine cell’s reuseIdentifier related to indexPath, configuration of requested cell for display and cell selection handler etc

Example

Initialisation with configuration


                                              
                                                _flexibleCollectionVC = FlexibleCollectionViewController(collectionViewLayout: CustomFlowLayout(), configuration: CollectionConfiguration(userInteractionEnabled: true, showsHorizontalScrollIndicator: false, isScrollEnabled: true, multipleTouchEnabled: false, backgroundColor: .clear))

Cell and supplementary view registering


                                              
                                                _flexibleCollectionVC.register(UICollectionViewCell.self, forCellWithReuseIdentifier: “UICollectionViewCell”)

_flexibleCollectionVC.registerSupplementaryView(UIHeaderImageCollectionView.self, kind: .header, reuseIdentifier: UIHeaderImageCollectionView.reuseIdentifier)

Requesting indentifier of cell for specific indexPath


                                              
                                                _flexibleCollectionVC.requestCellIdentifier = { value in

return “UICollectionViewCell”

}

Requesting indentifier of supplementary view for specific indexPath


                                              
                                                _flexibleCollectionVC.requestSupplementaryIdentifier = { value in

return UIHeaderImageCollectionView.reuseIdentifier

}

Configuration of input cell with related data to indexPath


                                              
                                                _flexibleCollectionVC.configureCell = { (cell: UICollectionViewCell, data: CollectionImageCellData?, indexPath: IndexPath) in

guard let data = data else {

return false

}
cell.backgroundColor = data.color
return true

}

Configuration of supplementary view with related kind and data to indexPath


                                              
                                                _flexibleCollectionVC.configureSupplementary = { (view: UICollectionReusableView, kind: SupplementaryKind, data: CollectionImageCellData?, indexPath: IndexPath) in

if let view = view as? UIHeaderImageCollectionView, let data = data {

view.text = data.category
return true

}
return false

}

Process cell selection to related indexPath


                                              
                                                _flexibleCollectionVC.cellDidSelect = { value in

return (deselect: true, animate: true)

}

Estimate cell size


                                              
                                                _flexibleCollectionVC.estimateCellSize = { value in

guard let layout = value.1 as? UICollectionViewFlowLayout else {

return nil

}
let col: CGFloat = 3

let width = value.0.bounds.width-(layout.sectionInset.left+layout.sectionInset.right)

let side = round(width/col)-layout.minimumInteritemSpacing

return CGSize(width: side, height: side)

}

Put predefined cells in generated order related to ListGenerator


                                              
                                                _flexibleCollectionVC.setData(getData())

Requirements

Swift 3 or above

Installation

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


                                              
                                                pod “FlexibleCollectionViewController”

GitHub

View Github

#collectionview #flexible #indexpath #swift3