如何在iOS8中使用Swift进行挖掘时隐藏/显示tabBar

时间：2014-11-19 04:02:49

标签： ios swift ios8 uitabbarcontroller

我试图用标签栏模仿UINavigationController的新hidesBarsOnTap。我已经看到很多这样的答案要么指向viewController上的hidesBottomBarWhenPushed，它只是完全隐藏它而不是在点击时。

 @IBAction func tapped(sender: AnyObject) {

    // what goes here to show/hide the tabBar ???


}

提前致谢

编辑：根据下面的建议我试过

self.tabBarController?.tabBar.hidden = true

确实隐藏了tabBar（在点按时切换true / false），但没有动画。我会问这是一个单独的问题。

10 个答案:

答案 0 :(得分：51)

经过多次搜索并尝试使用Swift优雅地隐藏/显示UITabBar的各种方法后，我可以使用this great solution by danh并将其转换为Swift：

func setTabBarVisible(visible:Bool, animated:Bool) {

//* This cannot be called before viewDidLayoutSubviews(), because the frame is not set before this time

    // bail if the current state matches the desired state
    if (tabBarIsVisible() == visible) { return }

    // get a frame calculation ready
    let frame = self.tabBarController?.tabBar.frame
    let height = frame?.size.height
    let offsetY = (visible ? -height! : height)

    // zero duration means no animation
    let duration:NSTimeInterval = (animated ? 0.3 : 0.0)

    //  animate the tabBar
    if frame != nil {
        UIView.animateWithDuration(duration) {
            self.tabBarController?.tabBar.frame = CGRectOffset(frame!, 0, offsetY!)
            return
        }
    }
}

func tabBarIsVisible() ->Bool {
    return self.tabBarController?.tabBar.frame.origin.y < CGRectGetMaxY(self.view.frame)
}

// Call the function from tap gesture recognizer added to your view (or button)

@IBAction func tapped(sender: AnyObject) {
    setTabBarVisible(!tabBarIsVisible(), animated: true)
}

答案 1 :(得分：27)

喜欢Michael Campsall的回答。如果有人感兴趣，这里的代码与扩展程序相同：

Swift 2.3 

extension UITabBarController {

    func setTabBarVisible(visible:Bool, animated:Bool) {

        // bail if the current state matches the desired state
        if (tabBarIsVisible() == visible) { return }

        // get a frame calculation ready
        let frame = self.tabBar.frame
        let height = frame.size.height
        let offsetY = (visible ? -height : height)

        // animate the tabBar
        UIView.animateWithDuration(animated ? 0.3 : 0.0) {
            self.tabBar.frame = CGRectOffset(frame, 0, offsetY)
            self.view.frame = CGRectMake(0, 0, self.view.frame.width, self.view.frame.height + offsetY)
            self.view.setNeedsDisplay()
            self.view.layoutIfNeeded()
        }
    }

    func tabBarIsVisible() ->Bool {
        return self.tabBar.frame.origin.y < CGRectGetMaxY(self.view.frame)
    }
}

Swift 3 

extension UIViewController {

    func setTabBarVisible(visible: Bool, animated: Bool) {
        //* This cannot be called before viewDidLayoutSubviews(), because the frame is not set before this time

        // bail if the current state matches the desired state
        if (isTabBarVisible == visible) { return }

        // get a frame calculation ready
        let frame = self.tabBarController?.tabBar.frame
        let height = frame?.size.height
        let offsetY = (visible ? -height! : height)

        // zero duration means no animation
        let duration: TimeInterval = (animated ? 0.3 : 0.0)

        //  animate the tabBar
        if frame != nil {
            UIView.animate(withDuration: duration) {
                self.tabBarController?.tabBar.frame = frame!.offsetBy(dx: 0, dy: offsetY!)
                return
            }
        }
    }

    var isTabBarVisible: Bool {
        return (self.tabBarController?.tabBar.frame.origin.y ?? 0) < self.view.frame.maxY
    }
}

答案 2 :(得分：13)

我必须稍微调整一下这个问题的答案。它隐藏了酒吧，但我的观点并没有适当调整大小，所以我在底部留下了一个空间。

以下代码在调整视图大小时成功动画显示标签栏的隐藏，以避免出现此问题。

针对Swift 3进行了更新（现在代码更简单） 

func setTabBarVisible(visible: Bool, animated: Bool) {
    guard let frame = self.tabBarController?.tabBar.frame else { return }
    let height = frame.size.height
    let offsetY = (visible ? -height : height)
    let duration: TimeInterval = (animated ? 0.3 : 0.0)

    UIView.animate(withDuration: duration,
                   delay: 0.0,
                   options: UIViewAnimationOptions.curveEaseIn,
                   animations: { [weak self] () -> Void in
                    guard let weakSelf = self else { return }
                    weakSelf.tabBarController?.tabBar.frame = frame.offsetBy(dx: 0, dy: offsetY)
                    weakSelf.view.frame = CGRect(x: 0, y: 0, width: weakSelf.view.frame.width, height: weakSelf.view.frame.height + offsetY)
                    weakSelf.view.setNeedsDisplay()
                    weakSelf.view.layoutIfNeeded()
    })
}

func handleTap(recognizer: UITapGestureRecognizer) {
    setTabBarVisible(visible: !tabBarIsVisible(), animated: true)
}

func tabBarIsVisible() -> Bool {
    guard let tabBar = tabBarController?.tabBar else { return false }
    return tabBar.frame.origin.y < UIScreen.main.bounds.height
}

较旧的Swift 2版本 

func setTabBarVisible(visible: Bool, animated: Bool) {
    // hide tab bar
    let frame = self.tabBarController?.tabBar.frame
    let height = frame?.size.height
    var offsetY = (visible ? -height! : height)
    println ("offsetY = \(offsetY)")

    // zero duration means no animation
    let duration:NSTimeInterval = (animated ? 0.3 : 0.0)

    // animate tabBar
    if frame != nil {
        UIView.animateWithDuration(duration) {
            self.tabBarController?.tabBar.frame = CGRectOffset(frame!, 0, offsetY!)
            self.view.frame = CGRectMake(0, 0, self.view.frame.width, self.view.frame.height + offsetY!)
            self.view.setNeedsDisplay()
            self.view.layoutIfNeeded()
            return
        }
    }
}

@IBAction func handleTap(recognizer: UITapGestureRecognizer) {
    setTabBarVisible(!tabBarIsVisible(), animated: true)
}

func tabBarIsVisible() -> Bool {
    return self.tabBarController?.tabBar.frame.origin.y < UIScreen.mainScreen().bounds.height
}

答案 3 :(得分：7)

您可以在swift中将此行添加到ViewDidLoad（）：

self.tabBarController?.tabBar.hidden = true

答案 4 :(得分：2)

我在ObjC中使用tabBar.hidden = YES来隐藏某些情况下的标签栏。不过，我还没有尝试将它连接到点击事件。

答案 5 :(得分：2)

代码没问题，但是当您使用presentViewController时，tabBarIsVisible()无效。要始终隐藏UITabBarController，请使用以下部分：

extension UITabBarController {
    func setTabBarVisible(visible:Bool, animated:Bool) {
        let frame = self.tabBar.frame
        let height = frame.size.height
        let offsetY = (visible ? -height : height)
        UIView.animateWithDuration(animated ? 0.3 : 0.0) {
            self.tabBar.frame = CGRectOffset(frame, 0, offsetY)
            self.view.frame = CGRectMake(0, 0, self.view.frame.width, self.view.frame.height + offsetY)
            self.view.setNeedsDisplay()
            self.view.layoutIfNeeded()
        }
    }
}

答案 6 :(得分：1)

Swift 3版本：

x = (char *) &a;

答案 7 :(得分：1)

雨燕5

隐藏

  override func viewWillAppear(_ animated: Bool) {
     self.tabBarController?.tabBar.isHidden = true
   }

再次显示

   override func viewDidDisappear(_ animated: Bool) {
    self.tabBarController?.tabBar.isHidden = false
  }

答案 8 :(得分：0)

对于 Swift 4 ，并通过将tabBar放置在视图外部来设置动画+隐藏：

if let tabBar = tabBarController?.tabBar,
   let y = tabBar.frame.origin.y + tabBar.frame.height {
   UIView.animate(withDuration: 0.2) {
     tabBar.frame = CGRect(origin: CGPoint(x: tabBar.frame.origin.x, y: y), size: tabBar.frame.size)
   }
}

答案 9 :(得分：-3)

要让动画与self.tabBarController?.tabBar.hidden = true一起使用，请执行以下操作：

UIView.animateWithDuration(0.2, animations: {
    self.tabBarController?.tabBar.hidden = true
})

除了其他解决方案之外，这也适用于autolayout。

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