返回 ViewController 时未设置 hidesBottomBarWhenPushed [英] hidesBottomBarWhenPushed not set when returning back to ViewController

问题描述

我为我的 UIViewController 之一(称为 ViewControllerA)设置了 hidesBottomBarWhenPushed = true，它被推送到我的 UINavigationController 堆栈上.当我在 ViewControllerA 上推送一个新的 ViewController 时，我也选择显示底部栏.因此我有:

I have the hidesBottomBarWhenPushed = true set for one of my UIViewController's (call it ViewControllerA) that is pushed onto my UINavigationController stack. I also opt to show the bottomBar when I push a new ViewController ontop of ViewControllerA. Therefore I have:

class ViewControllerA: UIViewController {

override func viewWillDisappear(animated: Bool) {
    self.hidesBottomBarWhenPushed = false
}

override func viewWillAppear(animated: Bool) {
    self.hidesBottomBarWhenPushed = true
}

这一切正常.

当我按下 ViewControllerA 时，底部栏隐藏.当我推送任何其他 ViewController 时，底部栏会显示.

When I push ViewControllerA, the bottom bar hides. When I push any other ViewController, the bottom bar shows.

但是，当我在导航堆栈中向后移动(也就是点击 UIBarButtonItemBack 按钮)时，当我弹出导航堆栈以显示 ViewControllerA 时，我无法隐藏 bottomBar.

However, when I am traveling backwards in the navigation stack (aka hitting the UIBarButtonItemBack button), I cannot get the bottomBar to hide when I pop the navigation stack to reveal ViewControllerA.

我错过了什么?谢谢！

推荐答案

明白了！这是有效的:

class ViewControllerCustom: UIViewController {
  init() {
    self.hidesBottomBarWhenPushed = true
  }

  override func viewDidAppear(animated: Bool) {
    self.hidesBottomBarWhenPushed = false
  }
}

然后在每个 UIViewController 的 BarButtonItemBack 自定义实现中，我检查前一个视图控制器(将被弹出以隐藏标签栏).当然，我把它抽象成一个通用函数，所以我不需要重复代码，但这是概念.感谢您帮助解决这个问题！

And then in every UIViewController's custom implementation of BarButtonItemBack pressed I check to see if the previous view controller (that will be popped to needs to hide the tab bar). Granted I abstracted this out into a general function so I didn't need to repeat code, but here's the concept. Thanks for the help figuring this out though!

func barButtonItemBackPressed(button: UIButton) {

  var viewControllers = self.navigationController!.viewControllers as! [UIViewController]
  if ((viewControllers[viewControllers.count - 2]).isKindOfClass(ViewControllerCustom.self)) {
    (viewControllers[viewControllers.count - 2] as! ViewControllerCustom).hidesBottomBarWhenPushed = true
  }

  self.navigationController?.popViewControllerAnimated(true)
}

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