隐藏视图后隐藏 UIButton（以编程方式添加）

Question

目标：隐藏视图后隐藏 UIButton（带图像）。

我有一个布局，当用户在屏幕上点击 (UITapGestureRecognizer) 时，可以隐藏地图视图。发生这种情况时，我想隐藏“关注用户按钮”三角形。目前我做不到。

我尝试过的：（来自多个 google/SO 帖子）

1)

followUserButton.removeFromSuperview()

followUserButton.widthAnchor.constraint(equalToConstant: 150).isActive = true
followUserButton.heightAnchor.constraint(equalToConstant: 150).isActive = true

followUserButton.setImage(image:nil for: .normal)

我尝试的最后一个基本上只是使图像变黑（以融入背景）。这看起来确实成功了，但是（参见 gif 图像），出于某种原因，第一次单击仍会显示按钮（非常亮 black/grey - 在图像的底部中间）。再次点击，地图视图出现，然后再次点击，地图视图终于消失

followUserButton.tintColor = .black

followUserButton.isHidden = 真

这就是我以编程方式添加按钮的方式

  var followUserImage: UIImage!
  var followUserButton: UIButton!

  override func viewDidLoad() {    
    setupFollowUserButton()
  }

  func setupFollowUserButton() {
          addFollowUserButton()
          self.view.addSubview(followUserButton)
          constraintFollowUserButton()
      }      

  func hideFollowUserButton() {
    if vcTrainMapView.isHidden {
      if followUserButton != nil {
        //  followUserButton.removeFromSuperview()
        //  followUserButton.tintColor = .black
        followUserButton.isHidden = true
      }
    } else if followUserButton != nil {
      followUserButton.tintColor = .lightGray
    }
  }

    func addFollowUserButton() {
        followUserButton = UIButton(type: UIButton.ButtonType.custom)
        followUserImage = UIImage(named: "follow_user_high")
        followUserButton.setImage(followUserImage, for:.selected)
        followUserImage = (UIImage(named: "follow_user"))
        followUserButton.setImage(followUserImage, for: .normal)
        followUserButton.tintColor = .lightGray
        followUserButton.addTarget(self, action: #selector(buttonAction(_:)), for: .touchUpInside)
      }
    
      @objc private func buttonAction(_ sender: UIButton) {
        self.followUserStatus = !self.followUserStatus
        sender.isSelected.toggle()
      }
      
      func constraintFollowUserButton() {
        followUserButton.translatesAutoresizingMaskIntoConstraints = false
        followUserButton.bottomAnchor.constraint(equalTo: vcTrainMapView.bottomAnchor, constant: -10).isActive = true
        followUserButton.leadingAnchor.constraint(equalTo: vcTrainMapView.leadingAnchor, constant: 10).isActive = true
        followUserButton.widthAnchor.constraint(equalToConstant: 50).isActive = true
        followUserButton.heightAnchor.constraint(equalToConstant: 50).isActive = true
      }

这就是我在上面的#3 中取得的成就。（gif 中的按钮很亮）

Answer 1

如果您要在显示详细信息视图（您的地图视图）的同时隐藏和显示一个按钮，并且您正在显示该按钮以使其看起来像是在该视图中，您可以只需将按钮直接添加到该视图而不是视图控制器主视图。

当然，您仍然可以从视图控制器控制按钮的操作，但如果将其添加到地图视图中，则在隐藏地图视图时按钮将被隐藏。

隐藏视图后隐藏 UIButton（以编程方式添加）

Hiding UIButton(which added programatically) once view is hidden

uibutton

ios

swift