Question: How it combined with iOS and UIKit?

[BlakeRxxk]

I decided to try stretch in demo project and I get frustrated. How should I work with UIView/UILabels and etc.

for example (layout code from docs with small tweaks):

class ViewController: UIViewController {
  let firstView: UIView = UIView()
  let secondView: UIView = UIView()

  override func loadView() {
    view = UIView()

    view.addSubview(firstView)
    view.addSubview(secondView)
  }

  override func viewDidLoad() {
    super.viewDidLoad()
    view.backgroundColor = .systemTeal
    firstView.backgroundColor = .systemPink
    secondView.backgroundColor = .magenta
  }

  override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    let node = Node(
      style: Style(justifyContent: .center,
                   size: Size(width: .points(375.0), height: .points(100.0))),
      children: [
        Node(style: Style(size: Size(width: .percent(0.5), height: .percent(0.5))), children: []),
        Node(style: Style(size: Size(width: .percent(0.5), height: .percent(0.5))), children: [])
      ])

    let layout = node.computeLayout(thatFits: Size(width: nil, height: nil))

    print("width: \(layout.width), height: \(layout.height)")
  }
}

questions:

• is there convenient wrapper/bridge to combine layouts and uikit? or i should write something like UIVIew+Stretch extensions which would convert measured layout to UIVIew frame size
  • which lifecycle method preferable for stretch layout computation?

ps: stretch looks very promising and it need better documentation with examples

[emilsjolander]

Hey Blake, Stretch isn't really designed to be used from user-space code. It is more designed to be used at the heart of GUI libraries and thus provides a very low level api. It is up to higher level libraries and frameworks to provide a consistent api frontend to stretch. The reason for this is so that we can focus on the algorithmic implementation and low level platform bindings in this project and don't need to worry about supporting bindings for every platform and UI framework out there.

[BlakeRxxk]

Oh I see. I thought about Stretch as replacement of Yoga+YogaKit, my mistake. Anyway, interesting project 👍

[emilsjolander]

It's a replacement for Yoga :) I would love to have the YogaKit equivalent implemented on top of Stretch but it is not something we have the time to maintain as part of this repository. If that is something you would like to build I'm more than happy to give input on implementation as well as feature your project on the stretch website 👍

[BlakeRxxk]

Actually I was thinking about it. I'll take a shot 👍