推/退时隐藏/显示标签栏。 swift

Question

回答：在每个视图控制器中使用 self.tabBarController?.tabBar.hidden 而不是 hidesBottomBarWhenPushed 来管理视图控制器是否应显示标签栏。

override func viewWillAppear(animated: Bool) {
    self.tabBarController?.tabBar.hidden = true/false
}

我要

视图控制器 1：应该显示标签栏

视图控制器 2：应该显示标签栏

视图控制器 3：不应显示标签栏。

视图控制器 4：不应显示标签栏。

我写了

// prepareForSegue in view controller 1, 
    let upcoming = segue.destinationViewController as! viewcontroller3
    upcoming.hidesBottomBarWhenPushed = true

// in view controller 3,
    func clickOnButton(button: UIButton) {
        self.hidesBottomBarWhenPushed = false
        self.performSegueWithIdentifier("viewController2", sender: self)
        self.hidesBottomBarWhenPushed = true
    }
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        if segue.identifier == "viewController2" {
            let upcoming = segue.destinationViewController as! viewController2
            upcoming.hidesBottomBarWhenPushed = false
        }
    }
// prepareForSegue in view controller 2
    let upcoming = segue.destinationViewController as! viewController4
    upcoming.hidesBottomBarWhenPushed = true

如果 1 -> 3 然后回到 1，有效。

如果 1 -> 3 -> 2 然后回到 3 再回到 1，有效。

如果 2 -> 4，则返回 2，有效。

如果 1 -> 3 -> 2 -> 4 则返回 2，不显示标签栏。想知道为什么。 hidesBottomBarWhenPushed 的任何建议或解释，因为它让我很困惑

Answer 1

顾名思义，hiddenBottomBarWhenPushed 仅在需要时隐藏底部栏，不会取消隐藏底部栏。你可以这样做来让它工作：

override func viewWillAppear(animated: Bool) {
    super.viewWillAppear(animated)
    self.tabBarController?.tabBar.hidden = true/false
}

或者简单地将 self.tabBarController?.tabBar.hidden = true/false 放入 prepareForSegue

但我不建议你这样做，因为如果bottomBar突然弹出会很奇怪，用户会认为他们突然回到了rootViewController，而实际上没有。

Users should always know where they are in your app and how to get to their next destination.

Answer 2

在 ViewController 您想要 pushed/popped 上的 hide/show 标签栏中添加此实现。它也适用于所有下一个推送的视图控制器。

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    if wilmove {
        hidesBottomBarWhenPushed = true
    }
    wilmove = false
}

override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
if wilmove {
        hidesBottomBarWhenPushed = false
    }
    wilmove = false
}

var wilmove = false
override func willMove(toParentViewController parent: UIViewController?) {
    super.willMove(toParentViewController: parent)
    wilmove = true
    if !isViewLoaded {
        hidesBottomBarWhenPushed = true
    }
}

Answer 3

将 hidesBottomBarWhenPushed 属性添加到目标视图控制器，并设置为 true。

推送示例 VC 标识符：

    let storyboard = UIStoryboard(name: STORYBOARD_NAME, bundle: nil)
    let vc = storyboard.instantiateViewController(withIdentifier: VC_IDENTIFIER) as! YourViewController
    vc.hidesBottomBarWhenPushed = true
    navigationController?.pushViewController(vc, animated: true)

Answer 4

这是我的两分钱。 Swift 3/4/5:

方法一：（推荐）

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "YourSegueIdentifier" {
        let destinationController = segue.destinationViewController as! YourViewController
        destinationController.hidesBottomBarWhenPushed = true // Does all the hide/show work.
    }
}

方法二：

override func viewWillAppear(_ animated: Bool) { // As soon as vc appears
    super.viewWillAppear(true)
    self.tabBarController?.tabBar.isHidden = false
}

override func viewWillDisappear(_ animated: Bool) { // As soon as vc disappears
    super.viewWillDisappear(true)
    self.tabBarController?.tabBar.isHidden = true
}

Answer 5

Swift 5

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    self.hidesBottomBarWhenPushed = true
}

Answer 6

Swift 5:

还有另一种方法...使 tabBar 淡入和淡出..并不是说这在战略上比任何其他方法更具优势，例如需要 prepareForSegue 的方法，但可以适应它。在任何情况下，通过淡入淡出在 tabBar (UIView) 上设置 .isHidden 时，动画标签栏 alpha 避免了严酷的 disappear/appear 效果。这是在任何 VC 中完成的，当 VC 被推入或加载时需要它隐藏，而当 VC 被弹出或卸载时需要它被隐藏。

这不会费心恢复标签栏，直到在导航栏中按下后退按钮或等效操作，这样当子 VC 被推到它上面时，标签栏将保持隐藏状态，这通常（但不总是）是有意义的。

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    UIView.animate(withDuration: 0.4, delay: 0.0, options: UIView.AnimationOptions.curveEaseOut, animations: {
        self.tabBarController?.tabBar.alpha = 0.0
    }, completion: { (finished: Bool) -> Void in
        self.tabBarController?.tabBar.isUserInteractionEnabled = false

    })
}

override func viewWillDisappear(_ animated: Bool) {
    if self.isMovingFromParent {
        UIView.animate(withDuration: 0.4, delay: 0.0, options: UIView.AnimationOptions.curveEaseOut, animations: {
            self.tabBarController?.tabBar.alpha = 1.0
        }, completion: { (finished: Bool) -> Void in
            self.tabBarController?.tabBar.isUserInteractionEnabled = true
        })
    }
}

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