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.

Solution 1

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.

Solution 2

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
    }

}

Solution 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
                    }
                }
            }
        }
    }
}

}

Solution 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
    }
}

Solution 5

Swift 4 solution:

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

View more solutions

Comments

[Oleg G.]

It's not Swift 3 compliant. "hidden" doesn't exist anymore.

[Federico Malagoni]

fixed to swift 3

[Ahmadreza]

on iPhone X , when tab bar is hidden there is a gray background of tab bar there.

[Dylan]

@Alfi same here, did you fixed it?

[Ahmadreza]

@Mark Dylan B Mercado, Sure I fixed it but I don't remember how, Sorry I does't have access to that project right now to help you more.

[RealNmae]

Nice solution. But when calling hidden = false when tab is not hidden, it makes jumpy animation

[RealNmae]

This solution is not save if you can call hidden=true when it's already hidden. It will move the frame endlessly down.