单击第一个按钮时在两个按钮之间显示uiview

import UIKit

class ViewController: UIViewController {
    var button1: UIButton!
    var button2: UIButton!
    var customView: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建按钮1
        button1 = UIButton(type: .system)
        button1.frame = CGRect(x: 50, y: 100, width: 100, height: 50)
        button1.setTitle("按钮1", for: .normal)
        button1.addTarget(self, action: #selector(button1Clicked), for: .touchUpInside)
        view.addSubview(button1)
        
        // 创建按钮2
        button2 = UIButton(type: .system)
        button2.frame = CGRect(x: 200, y: 100, width: 100, height: 50)
        button2.setTitle("按钮2", for: .normal)
        view.addSubview(button2)
        
        // 创建自定义视图
        customView = UIView(frame: CGRect(x: button1.frame.maxX, y: button1.frame.minY, width: button2.frame.minX - button1.frame.maxX, height: button1.frame.height))
        customView.backgroundColor = .red
        view.addSubview(customView)
    }
    
    @objc func button1Clicked() {
        // 将自定义视图置于按钮之间
        view.bringSubviewToFront(customView)
    }
}