从任意锚点弹出- Swift

import UIKit

class ViewController: UIViewController {
    // 创建一个按钮作为锚点
    let anchorButton = UIButton(type: .system)

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置锚点的位置和大小
        anchorButton.frame = CGRect(x: 100, y: 100, width: 100, height: 50)
        anchorButton.setTitle("弹出视图", for: .normal)
        anchorButton.addTarget(self, action: #selector(showPopup), for: .touchUpInside)
        
        // 将锚点添加到视图中
        view.addSubview(anchorButton)
    }
    
    @objc func showPopup() {
        // 创建要弹出的视图控制器
        let popupViewController = PopupViewController()
        
        // 设置弹出样式为全屏
        popupViewController.modalPresentationStyle = .fullScreen
        
        // 弹出视图控制器
        present(popupViewController, animated: true, completion: nil)
    }
}

class PopupViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 设置弹出视图的样式和内容
        view.backgroundColor = .white
        let label = UILabel(frame: CGRect(x: 100, y: 200, width: 200, height: 50))
        label.text = "这是一个弹出视图"
        view.addSubview(label)
    }
}