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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