ios - 按钮 Playground swift

Question

我只是想添加一个创建 View 的按钮操作。 有人可以帮助我吗？

import UIKit
import PlaygroundSupport

class ViewController : UIViewController {
    override func viewDidLoad() {
        view.backgroundColor = UIColor.black
        navigationController?.isNavigationBarHidden = true

        let button = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 50))
        button.backgroundColor = UIColor.white
        view.addSubview(button)

        class Button: ViewController {
            @objc func fbtn () {
                let newView = UIView()
                newView.backgroundColor = UIColor.yellow
                view.addSubview(newView)
            }
        }
        button.addTarget(button, action: #selector(Button.fbtn), for: .touchUpInside)
    }
}
PlaygroundPage.current.liveView = UINavigationController(rootViewController: ViewController())

Answer 1

您的嵌套 Button 类似乎没有意义。只需将 fbtn 设为 ViewController 类的函数即可。并使 self 成为按钮操作的目标。

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

        view.backgroundColor = .black
        navigationController?.isNavigationBarHidden = true

        let button = UIButton(frame: CGRect(x: 0, y: 0, width: 100, height: 50))
        button.backgroundColor = .white
        view.addSubview(button)

        button.addTarget(self, action: #selector(fbtn), for: .touchUpInside)
    }

    @objc func fbtn() {
        let newView = UIView()
        newView.backgroundColor = .yellow
        view.addSubview(newView)
    }
}

此外，在 fbtn 函数中为 newView 提供一个有用的框架。