devxoul/Then

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 = .black
  $0.text = "Hello, World!"
}

This is equivalent to:

let label: UILabel = {
  let label = UILabel()
  label.textAlignment = .center
  label.textColor = .black
  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("[email protected]", 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

• Using CocoaPods:

  pod 'Then'
  

• Using Swift Package Manager:

  import PackageDescription
  
  let package = Package(
    name: "MyAwesomeApp",
    dependencies: [
      .Package(url: "https://github.com/devxoul/Then", majorVersion: 2),
    ]
  )
  

License

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