ios - Swift 删除对 View Controller 的引用

Question

我正在通过导航 Controller 以编程方式添加 View Controller ，因为我需要在显示 Controller 时访问导航栏。

我目前正在通过以下方法执行此操作，但是我需要能够在用户点击关闭按钮时删除对 View Controller 的引用。

let settingsController = storyboard?.instantiateViewController(withIdentifier: "SettingsController") as! SettingsController
            settingsController.view.alpha = 0
            settingsController.view.transform = CGAffineTransform(translationX: 0, y: self.view.frame.height)
            self.view.addSubview(settingsController.view)
            UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
                print(self.view.frame.height)
                settingsController.view.transform = CGAffineTransform(translationX: 0, y: self.view.frame.height - 142)
                settingsController.view.alpha = 1
            }, completion: nil)

有没有办法在当前的 self.dismiss 或 self.popViewController 不起作用时执行此操作？

谢谢

更新

我尝试使用标准的 perform segue(如下)实现此解决方案，方法是提供模态选项，因为我需要保持导航栏处于事件状态。设置 Controller 高度小于 View 框架。这没有用，所以我正在尝试上述方法。

    self.definesPresentationContext = true
    self.modalPresentationStyle = .overCurrentContext
    self.modalTransitionStyle = .coverVertical
    self.performSegue(withIdentifier: "SettingsSegue", sender: nil)

当我调用设置 Controller 并关闭时，另一个设置 Controller 被添加，导致多个设置 Controller 。这是我的问题。

Answer 1

var settingsController : 设置 Controller !

@IBAction func btnNext(_ sender: Any) {
    settingsController  = storyboard?.instantiateViewController(withIdentifier: "SettingsController") as! SettingsController
    settingsController.view.alpha = 1
    settingsController.view.transform = CGAffineTransform(translationX: 0, y: self.view.frame.height)
    self.view.addSubview(settingsController.view)
    UIView.animate(withDuration: 0.5, delay: 0, usingSpringWithDamping: 1, initialSpringVelocity: 1, options: .curveEaseOut, animations: {
        print(self.view.frame.height)
        self.settingsController.view.transform = CGAffineTransform(translationX: 0, y: self.view.frame.height - 142)
        self.settingsController.view.alpha = 1
    }, completion: nil)

}

@IBAction func btnDismiss(_ sender: Any) {
        self.settingsController.view.removeFromSuperview()
}