Setup closures

SetupClosures.swift

/// make { ... }

func make<T>(_ setup: (T) -> Void) -> T where T: NSObject {
  let instance = T()
  setup(instance)
  return instance
}

let label: UILabel = make {
  $0.text = "Welcome"
  $0.font = .systemFont(ofSize: 18)
  $0.textColor = .blue
}

/// init().then { ... }

extension NSObjectProtocol where Self: NSObject {
  func then(setup: (Self) -> Void) -> Self {
    setup(self)
    return self
  }
}

lazy var button = UIButton(type: .system).then {
  $0.setImage(UIImage(named: "Plus"), for: .normal)
  $0.tintColor = .white
  $0.addTarget(self, action: #selector(didTapPlusButton), for: .touchUpInside)
}

/// init { ... }

extension NSObjectProtocol where Self: NSObject {
  init(_ setup: (Self) -> Void) {
    self.init()
    setup(self)
  }
}

let label = UILabel {
  $0.text = "Hello"
  $0.font = .systemFont(ofSize: 18)
  $0.textColor = .blue
}

https://itnext.io/refactoring-in-swift-setup-closures-d06b896c412c
https://www.reddit.com/r/swift/comments/9efxuj/refactoring_in_swift_setup_closures/
https://medium.com/the-traveled-ios-developers-guide/swift-initialization-with-closures-5ea177f65a5
https://mackarous.com/dev/2019/1/23/a-better-syntax-for-configurable-initializations