Then

✨ Super sweet syntactic sugar for Swift initializers.

At a Glance

Initialize UILabel then set its properties.

let label = UILabel().then {
  $0.textAlignment = .Center
  $0.textColor = .blackColor()
  $0.text = "Hello, World!"
}

This is equivalent to:

let label: UILabel = {
  let label = UILabel()
  label.textAlignment = .Center
  label.textColor = .blackColor()
  label.text = "Hello, World!"
  return label
}()

Tips and Tricks

• You can use then() to all of NSObject subclasses.

  let queue = OperationQueue().then {
    $0.maxConcurrentOperationCount = 1
  }

• Want to use with your own types? Just make extensions.

  extension MyType: Then {}
  
  let instance = MyType().then {
    $0.really = "awesome!"
  }

• Use with() when copying the value types.

  let newFrame = oldFrame.with {
    $0.size.width = 200
    $0.size.height = 100
  }
  newFrame.width // 200
  newFrame.height // 100

• Use do() to do something with less typing.

  UserDefaults.standard.do {
    $0.set("devxoul", forKey: "username")
    $0.set("devxoul@gmail.com", forKey: "email")
    $0.synchronize()
  }

Real World Example

Here's an example usage in an UIViewController subclass.

final class MyViewController: UIViewController {

    let titleLabel = UILabel().then {
      $0.textColor = .black
      $0.textAlignment = .center
    }

    let tableView = UITableView().then {
      $0.backgroundColor = .clear
      $0.separatorStyle = .none
      $0.register(MyCell.self, forCellReuseIdentifier: "myCell")
    }

    override func viewDidLoad() {
      super.viewDidLoad()
      self.view.addSubview(self.titleLabel)
      self.view.addSubview(self.tableView)
    }

}

Installation

• For iOS 8+ projects with CocoaPods:

  pod 'Then', '~> 1.0'

• For iOS 8+ projects with Carthage:

  github "devxoul/Then" ~> 1.0
  

• For iOS 7 projects with CocoaSeeds:

  github 'devxoul/Then', '1.0.3', :files => 'Sources/*.swift'

• Using Swift Package Manager:

  import PackageDescription
  
  let package = Package(
    name: "MyAwesomeApp",
    dependencies: [
      .Package(url: "https://github.com/devxoul/Then", "1.0.3"),
    ]
  )

License

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