Question

在swift playgrounds中你如何设置一个viewcontroller并使用它？我之前用UIView完成了它，但是当处于不同的方向时UI被切断，所以我想尝试使用viewcontroller。我已经let view = UIViewController()了，但之后如何设置它以添加背景和内容呢？

Answer 1

我发现要在swift playground中创建一个viewcontroller，你需要这个代码

import UIKit
import PlaygroundSupport

class ViewController:UIViewController{
    override func viewDidLoad() {
        super.viewDidLoad()

    }

}

let viewController = ViewController()
PlaygroundPage.current.liveView = viewController
PlaygroundPage.current.needsIndefiniteExecution = true

Answer 2

Playground中具有多个子视图和自动布局的UIViewController示例。

import UIKit
import PlaygroundSupport

class ViewController : UIViewController {

    var yellowView: UIView!
    var redView: UIView!

    override func loadView() {

        // UI

        let view = UIView()
        view.backgroundColor = .white

        yellowView = UIView()
        yellowView.backgroundColor = .yellow
        view.addSubview(yellowView)

        redView = UIView()
        redView.backgroundColor = .red
        view.addSubview(redView)

        // Layout
        redView.translatesAutoresizingMaskIntoConstraints = false
        yellowView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            yellowView.topAnchor.constraint(equalTo: view.topAnchor, constant: 20),
            yellowView.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20),
            yellowView.widthAnchor.constraint(equalToConstant: 80),
            yellowView.heightAnchor.constraint(equalToConstant: 80),

            redView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -20),
            redView.trailingAnchor.constraint(equalTo: view.trailingAnchor,constant: -20),
            redView.widthAnchor.constraint(equalToConstant: 80),
            redView.heightAnchor.constraint(equalToConstant: 80)
            ])

        self.view = view
    }

    override func viewDidLoad() {
        super.viewDidLoad()
    }
}

PlaygroundPage.current.liveView = ViewController()

this mailing list thread

如何在Playgrounds中设置ViewController？

2 个答案: