Index

Example

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

Requirements

Installation

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

pod 'Index'

Definitions

---

1. IndexProtocol

IndexProtocol is the main protocol used in derivated classes. It has methods that helps creating array for indexed elements.

• .value: Index?
• .indexPath: IndexPath
• .isSelected: Bool { get }
• .select(_ isSelected: Bool)
• .init()

2. Row

The row class has the Index generic type to conforms with IndexProtocol. The main ideia in all methods specified in the parent protocol is to create a new instance from itself. To update the list of rows, for example, you need to reset the array of rows.

Here it goes some example:

class TestViewController: UIViewController {
    var cars: [Row<Car>] = []
    
    func didDownload(_ array: [Car]) {
        self.cars = array.enumerated().map {
            Row($0.element, indexPath: .init(row: $0.offset, section: 0))
        }
    }
}

The Row class helps collection cells or table cells to reload it state and now values as indexPath or if it is selected or not.

class TestViewCell: UITableViewCell {
    
    func reloadState(_ index: Row<Car>) {
        guard !index.isEmpty else {
            return
        }
        
        self.titleLabel.text = index.item.name
        self.priceLabel.text = index.item.price.asPrice
        
        if index.isSelected {
            self.selectedLayout()
        } else {
            self.notSelectedLayout()
        }
    }
}

3. Section

Section has two generic types X and Y as Section class and Row.Index class. This is only a template to prepare for SectionRow class.

The methods implement for Section are:

• .init(_ section: X, items: [Y], section index: Int = 0)
• .asSectionRows: [SectionRow]

4. SectionRow

SectionRow is a wrapper for Row because it allows us to access section attributes without needing to call extra methods.

It has:

• .value: Section?
• .row: Row
• .init(_ section: Section, row: Row)
• .indexPath: IndexPath
• .isSelected: Bool
• .isFirst: Bool
• .isLast: Bool
• .select(_ isSelected: Bool)

5. SectionDataSource

This helps to turn classes with .items: [T] { get } into Section class. If you have a array of [SectionDataSource] you can call .asSectionRow or .asSection getters to have a list of data ready to be used in our tableview.

6. Identifier

This class implement the identifier getter and conforms with Hashable allowing you to have a unique array of these elements.

Extra Subspecs extensions

1. UIContainer

From UIContainer, this extension helps to transform an array of Index into a array of UIContainer views.

    class TestViewController: UIViewController {
        weak var carsSV: UIStackView!
        
        func reloadCars(_ rows: [Row<Car>]) {
            self.carsSV.arrangedSubviews.forEach {
                $0.removeFromSubview()
            }
            
            CarView.Container.asCells(rows, in: self)
                .forEach { container, row in
                    container.view.reloadState(row)
                    carsSV.addArrangedSubview(container)
                }
        }
    }

2. IndexBindable

From UMUtils that implements ViewModel, the IndexBindable allows to create cells more reactive using RxSwift and RxCocoa libraries.

This cames with to classes:

• RowBindable
• SectionRowBindable

Here it goes some example:

class CarView: View, RowModel, ContainerCellDelegate {
    typealias Item = Car
    
    override func prepare() {
        super.prepare()
        
        self.titleLabel.font = UIFont(name: "RobotoFont-regular", size: 16.0)
        self.priceLabel.font = UIFont(name: "RobotoFont-bold", size: 18.0)
        
        self.viewModel = RowModel()
    }
    
    override func reloadViews(_ index: Row<Car>) {
        guard !index.isEmpty else {
            return
        }
        
        self.titleLabel.text = index.item.name
        self.priceLabel.text = index.item.price.asPrice
        
        if index.isSelected {
            self.selectedLayout()
        } else {
            self.notSelectedLayout()
        }
    }
}

extension TestView {
    class Cell: ContainerTableViewCell<TestView> {
        override func containerDidLoad() {
            super.containerDidLoad()
            self.selectionStyle = .none
        }
    }
}

On our view controller we need:

    extension TestViewController: UITableViewDataSource {
        func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
            return self.cars.count
        }
        
        func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
            let cell = tableView.dequeueReusableCell(withIdentifier: "TestViewCellIdentifier", for: indexPath) as! TestView.Cell
            
            cell.prepareContainer(inside: self)
            cell.view.configure(row)
            
            return cell
        }
    }

Author

brennobemoura, brenno@umobi.com.br

License

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