xcode 如何在 Playgrounds 中设置 ViewController？
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How to setup ViewController in Playgrounds?
提问by David Williamson
In swift playgrounds how do you setup a viewcontroller and use it? I've done it with a UIView before but the UI gets cut when in a difference orientation so I want to try use a viewcontroller.
I've got let view = UIViewController()but after that how do I set it up to add a background and stuff on it?
在 swift playgrounds 如何设置视图控制器并使用它？我以前用 UIView 完成过，但是在不同方向时 UI 会被剪切，所以我想尝试使用视图控制器。我有，let view = UIViewController()但在那之后我如何设置它以添加背景和内容？
回答by David Williamson
I found that to create a viewcontroller in swift playgrounds you need this code
我发现要在 swift 游乐场中创建一个视图控制器，您需要此代码
import UIKit
import PlaygroundSupport
class ViewController:UIViewController{
override func viewDidLoad() {
super.viewDidLoad()
}
}
let viewController = ViewController()
PlaygroundPage.current.liveView = viewController
PlaygroundPage.current.needsIndefiniteExecution = true
回答by Rizwan Mehboob
Example of UIViewController in Playground with multiple Subviews and Auto layout.
具有多个子视图和自动布局的 Playground 中的 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()
