DuctTape

KeyPath dynamicMemberLookup based syntax sugar for Swift.

screen

let label = UILabel().ductTape
    .numberOfLines(0)
    .textColor(.red)
    .text("Hello, World!!")
    .build()

Above is same as below definition.

let label: UILabel = {
    let label = UILabel()
    label.numberOfLines = 0
    label.textColor = .red
    label.text = "Hello, World!!"
    return label
}()

Usage

NSObject already has been compatible with DuctTape, so you can access .ductTape property like below.

let builder: Builder<UIView> = UIView().ductTape

If you access .ductTape, it returns Builder that provides setter of properties via KeyPath dynamicMemberLookup.

let view: UIView = UIView().ductTape
    .backgroundColor(.red)
    .translatesAutoresizingMaskIntoConstraints(false)
    .build()

Finally, if you call .build(), Builder returns instance that has set property values.

How to access methods

If you want to access methods of object which is building, func reinforce(_ handler: (Base) -> Void) Builder<Base> enable to access methods.

let collectionView = UICollectionView().ductTape
    .backgroundColor(.red)
    .reinforce { collectionView in
        collectionView.register(UITableViewCell.self, forCellWithReuseIdentifier: "Cell")
    }
    .build()

Builder has func reinforce<T1, ...>(_ t1: T1, ..., handler: (Base) -> Void) Builder<Base> methods.
In additional usage, be able to access outside object with func reinforce if passing objects as arguments.

lazy var collectionView = UICollectionView().ductTape
    .translatesAutoresizingMaskIntoConstraints(false)
    .reinforce(view) { collectionView, view in
        view.addSubview(collectionView)
        NSLayoutConstraint.activate([
            view.topAnchor.constraint(equalTo: collectionView.topAnchor),
            view.leadingAnchor.constraint(equalTo: collectionView.leadingAnchor),
            view.trailingAnchor.constraint(equalTo: collectionView.trailingAnchor),
            view.bottomAnchor.constraint(equalTo: collectionView.bottomAnchor)
        ])
    }
    .build()

How to use DuctTape with self-implemented classes

There are two ways to use DuctTape.

  1. Use DuctTapeCompatible
class Dog: DuctTapeCompatible {
    var name: String
}

let dog = Dog().ductTape
    .name("Copernicus")
    .build()
  1. Use Builder directly
class Dog {
    var name: String
}

let dog = Builder(Dog())
    .name("Copernicus")
    .build()

Sample Code

class ViewController: UIViewController {

    let flowLayout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
        .ductTape
        .minimumLineSpacing(10)
        .minimumInteritemSpacing(10)
        .itemSize(CGSize(width: 100, height: 100))
        .scrollDirection(.vertical)
        .build()

    lazy var collectionView: UICollectionView = UICollectionView(frame: .zero,
                                                                 collectionViewLayout: flowLayout)
        .ductTape
        .dataSource(self)
        .delegate(self)
        .translatesAutoresizingMaskIntoConstraints(false)
        .reinforce {
            $0.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "Cell")
        }
        .build()

    override func viewDidLoad() {
        super.viewDidLoad()

        view.addSubview(collectionView)
        NSLayoutConstraint.activate([
            view.topAnchor.constraint(equalTo: collectionView.topAnchor),
            view.leadingAnchor.constraint(equalTo: collectionView.leadingAnchor),
            view.trailingAnchor.constraint(equalTo: collectionView.trailingAnchor),
            view.bottomAnchor.constraint(equalTo: collectionView.bottomAnchor)
        ])
    }
}

Requirement

  • Xcode 11
  • macOS 10.10
  • iOS 9.0
  • tvOS 10.0
  • watchOS 3.0

Installation

CocoaPods

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

pod "DuctTape"

Carthage

If you’re using Carthage, simply add
DuctTape to your Cartfile:

github "marty-suzuki/DuctTape"

Swift Package Manager

Simply add the following line to your Package.swift:

.package(url: "https://github.com/marty-suzuki/DuctTape.git", from: "version")

GitHub