Swift UITabBarController hide with animation

Question

I'm trying to add animation to my tabBarController when hidden. Im able to accomplish this effect with the navigationBarController by using self.navigationController?.isNavigationBarHidden = true . I'm able to hide the tabBar by using self.tabBarController?.tabBar.isHidden = true but i do not get the animation how can I do this thank you in advance.

Answer 1

I've developed a util extension for UIViewController
Swift 4 compatible:

extension UIViewController {

    func setTabBarHidden(_ hidden: Bool, animated: Bool = true, duration: TimeInterval = 0.3) {
        if animated {
            if let frame = self.tabBarController?.tabBar.frame {
                let factor: CGFloat = hidden ? 1 : -1
                let y = frame.origin.y + (frame.size.height * factor)
                UIView.animate(withDuration: duration, animations: {
                    self.tabBarController?.tabBar.frame = CGRect(x: frame.origin.x, y: y, width: frame.width, height: frame.height)
                })
                return
            }
        }
        self.tabBarController?.tabBar.isHidden = hidden
    }

}

Answer 2

You could change the tab bar's frame inside an animation, so something like:

func hideTabBar() {
    var frame = self.tabBarController?.tabBar.frame
    frame?.origin.y = self.view.frame.size.height + (frame?.size.height)!
    UIView.animate(withDuration: 0.5, animations: {
        self.tabBarController?.tabBar.frame = frame!
    })
}

func showTabBar() {
    var frame = self.tabBarController?.tabBar.frame
    frame?.origin.y = self.view.frame.size.height - (frame?.size.height)!
    UIView.animate(withDuration: 0.5, animations: {
        self.tabBarController?.tabBar.frame = frame!
    })
}

Which sets the tab bar just below the visible screen, so that it slides up/down from the bottom.

Answer 3

Improvement of the response of @Luca Davanzo. If the bar is already hidden, it will continue hiding it and moving it lower. Also get rid of the return, so the state of the tabbar.hidden changes when the animation happens. So I added a check:

extension UIViewController {

func setTabBarHidden(_ hidden: Bool, animated: Bool = true, duration: TimeInterval = 0.5) {
    if self.tabBarController?.tabBar.isHidden != hidden{
        if animated {
            //Show the tabbar before the animation in case it has to appear
            if (self.tabBarController?.tabBar.isHidden)!{
                self.tabBarController?.tabBar.isHidden = hidden
            }
            if let frame = self.tabBarController?.tabBar.frame {
                let factor: CGFloat = hidden ? 1 : -1
                let y = frame.origin.y + (frame.size.height * factor)
                UIView.animate(withDuration: duration, animations: {
                    self.tabBarController?.tabBar.frame = CGRect(x: frame.origin.x, y: y, width: frame.width, height: frame.height)
                }) { (bool) in
                    //hide the tabbar after the animation in case ti has to be hidden
                    if (!(self.tabBarController?.tabBar.isHidden)!){
                        self.tabBarController?.tabBar.isHidden = hidden
                    }
                }
            }
        }
    }
}

}

Answer 4

In case if you need to toggle it from hide to visible and vice versa:

func toggleTabbar() {
    guard var frame = tabBarController?.tabBar.frame else { return }
    let hidden = frame.origin.y == view.frame.size.height
    frame.origin.y = hidden ? view.frame.size.height - frame.size.height : view.frame.size.height
    UIView.animate(withDuration: 0.3) {
        self.tabBarController?.tabBar.frame = frame
    }
}

Answer 5

Swift 4 solution:

tabBarController?.tabBar.isHidden = true
UIView.transition(with: tabBarController!.view, duration: 0.35, options: .transitionCrossDissolve, animations: nil)

Answer 6

Here is a simple extension :

func setTabBar(hidden:Bool) {
    guard let frame = self.tabBarController?.tabBar.frame else {return }
    if hidden {
        UIView.animate(withDuration: 0.3, animations: {
            self.tabBarController?.tabBar.frame = CGRect(x: frame.origin.x, y: frame.origin.y + frame.height, width: frame.width, height: frame.height)
        })
    }else {

        UIView.animate(withDuration: 0.3, animations: {
            self.tabBarController?.tabBar.frame = UITabBarController().tabBar.frame

        })
    }
}

Answer 7

You have to add UIView transitionWithView class func

Swift 2

func hideTabBarWithAnimation() -> () {
    UIView.transitionWithView(tableView, duration: 1.0, options: .TransitionCrossDissolve, animations: { () -> Void in
        self.tabBarController?.tabBar.hidden = true
    }, completion: nil)
}

Swift 3, 4, 5

func hideTabBarWithAnimation() -> () {
    UIView.transition(with: tableView, duration: 1.0, options: .transitionCrossDissolve, animations: { () -> Void in
        self.tabBarController?.tabBar.isHidden = true
    }, completion: nil)
}

Answer 8

So I've been playing around for 3 days with this now, finding out that the one that worked for me in my code was Adriana's post from 14th Sept 2018. But I was not sure how to use the coding once copied into my Project. So, after much experimenting I found that the way I could use this func was to put the following into into the respective swipe actions.

setTabBarHidden(false)


setTabBarHidden(true)

My next step is to try to get the swipe actions working while using UIScrollView in the same UIView at the same time.