【Swift UIKit】UIToolbarとUIBarButtonItemの使い方！

@MainActor  class UIToolbar : UIView

import UIKit

class ViewController: UIViewController{
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let toolBarHeight = 50
        let toolBar = UIToolbar(frame: CGRect(
            x: 0,
            y: Int(UIScreen.main.bounds.height) - toolBarHeight,
            width: Int(UIScreen.main.bounds.width),
            height: toolBarHeight)
        )
        
        toolBar.sizeToFit()
        
        // スペーサー構築
        let spacer = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.flexibleSpace, target: self, action: nil)
        // 閉じるボタン構築
        let closeButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.add, target: self, action:#selector(buttonTapped))
        
        toolBar.items = [spacer, closeButton]
        self.view.addSubview(toolBar)
        
    }
    @objc  func buttonTapped() {
        print("tapped")
    }
}

self.view.backgroundColor = .black
toolBar.isTranslucent = true

enum UIBarStyle : Int, @unchecked  Sendable {
    case `default`
    case black
}

toolBar.barStyle  = .black

 override func viewDidLoad() {
  super.viewDidLoad()

  let toolBar = UIToolbar()
  toolBar.sizeToFit()
  let spacer = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.flexibleSpace, target: self, action: nil)
  let closeButton = UIBarButtonItem(barButtonSystemItem: UIBarButtonItem.SystemItem.done, target: self, action:#selector(commitButtonTapped))

  toolBar.items = [spacer, closeButton]
  textField.inputAccessoryView = toolBar
}

@objc    func closeButtonTapped() {
    self.view.endEditing(true)
}

@MainActor  class UIBarButtonItem : UIBarItem

convenience init(
    title: String?,
    style: UIBarButtonItem.Style,
    target: Any?,
    action: Selector?
)

convenience init(
    image: UIImage?,
    style: UIBarButtonItem.Style,
    target: Any?,
    action: Selector?
)

convenience init(
    barButtonSystemItem systemItem: UIBarButtonItem.SystemItem,
    target: Any?,
    action: Selector?
)