Playground 可视化开发

我们只需要将想要显示的 UIView 子类赋值给当前 PlaygroundPage 的 liveView 属性，并且打开 Assistant Editor (Alt + Shift + Command + Return)，就能看到我们创建的视图了

import UIKit
import PlaygroundSupport

let label = UILabel(frame: CGRect(x: 0, y: 0, width: 200, height: 100))
label.backgroundColor = .cyan
label.font = UIFont.systemFont(ofSize: 35)
label.textAlignment = .center
label.text = "Hello World"
label.layer.masksToBounds = true
label.layer.cornerRadius = 20
PlaygroundPage.current.liveView = label

image.png

----------

import UIKit
import PlaygroundSupport

class ViewController: UITableViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .cyan
    }
}

extension ViewController {
    override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 30
    }
    
    override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cell = UITableViewCell()
        cell.textLabel?.text = String(indexPath.row)
        return cell
    }
}

extension ViewController {
    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        print("Select: \(indexPath.row)")
    }
}

let vc = ViewController()
PlaygroundPage.current.liveView = vc