Question

在询问之前，我已经经历了许多Stacksoverflow问题。没有人能够解决我的问题。我使用

制作了一个自定义按钮

class TabBarViewController: UITabBarController {

let button = UIButton.init(type: .custom)

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    button.setImage(UIImage(named: "assetIcon"), for: .normal)
    button.backgroundColor = .blue
    button.layer.cornerRadius = 35

    self.view.insertSubview(button, aboveSubview: self.tabBar)
    self.view.layoutIfNeeded()
}

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    let distance =  ((self.view.bounds.height)/100)*11

    // safe place to set the frame of button manually
    button.frame = CGRect.init(x: self.tabBar.center.x - 32, y: self.view.bounds.height - distance, width: 70, height: 70)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func hideTabButton() {
    self.button.isHidden = true
}

func showTabButton() {
    self.button.isHidden = false
   }
}

但是，当我从另一个要隐藏它的视图中调用hideTabButton的功能时，该按钮仍会显示。我从

调用了该功能

 override func viewDidAppear(_ animated: Bool) {
    let vc = storyboard?.instantiateViewController(withIdentifier: "tabBarVC") as! TabBarViewController
    vc.hideTabButton()
}

它没有隐藏按钮。有解决方案或指南可以提供帮助的人吗？

Answer 1

您正试图在创建它之前将其隐藏，您只需实例化TabBarViewController现在就应该将标志从当前屏幕传递到TabBarViewController屏幕，然后在TabBarViewController屏幕中传递请执行以下操作。

class TabBarViewController: UITabBarController {
var hideButton:Bool = false
let button = UIButton.init(type: .custom)

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    button.setImage(UIImage(named: "assetIcon"), for: .normal)
    button.backgroundColor = .blue
    button.layer.cornerRadius = 35
    self.view.insertSubview(button, aboveSubview: self.tabBar)
    self.view.layoutIfNeeded()
}

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()

    let distance =  ((self.view.bounds.height)/100)*11

    // safe place to set the frame of button manually
    button.frame = CGRect.init(x: self.tabBar.center.x - 32, y: self.view.bounds.height - distance, width: 70, height: 70)
    button.isHidden = hideButton
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

func hideTabButton() {
    self.button.isHidden = true
}

func showTabButton() {
    self.button.isHidden = false
   }
}

如果尚未实例化，现在只需将布尔值传递给TabbarViewController

override func viewDidAppear(_ animated: Bool) {
  let vc = storyboard?.instantiateViewController(withIdentifier: "tabBarVC") as! TabBarViewController
  vc.hideButton=true
}

如果您的标签栏已被实例化，请再次对其进行实例化，如下所示

if let tabController = self.tabbarController as? TabbarViewController{ tabController.button.isHidden = true }

当尝试取消隐藏时，只需将true更改为false

if let tabController = self.tabbarController as? TabbarViewController{ tabController.button.isHidden = false }

标签栏中的自定义UIButton无法隐藏

1 个答案: