How to hide tab bar with animation in iOS?

Question

So I have a button that is connected to a IBAction. When I press the button I want to hide the tab bar in my iOS app with a animation. This [self setTabBarHidden:hidde

Answer 1

Rewrite Sherwin Zadeh's answer in Swift 4:

/* tab bar hide/show animation */
extension AlbumViewController {
    // pass a param to describe the state change, an animated flag and a completion block matching UIView animations completion
    func setTabBarVisible(visible: Bool, animated: Bool, completion: ((Bool)->Void)? = nil ) {

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

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

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

        UIView.animate(withDuration: duration, animations: {
            let frame = self.tabBarController!.tabBar.frame
            self.tabBarController!.tabBar.frame = frame.offsetBy(dx: 0, dy: offsetY)
        }, completion:completion)
    }

    func tabBarIsVisible() -> Bool {
        return tabBarController!.tabBar.frame.origin.y < view.frame.maxY
    }
}

Answer 2

Try to set the frame of the tabBar in animation. See this tutorial.

Just be aware, it's bad practice to do that, you should set show/hide tabBar when UIViewController push by set the property hidesBottomBarWhenPushed to YES.

Answer 3

Unfortunately, I can't comment on HixField's answer because I don't have enough reputation, so I have to leave this as a separate answer.

His answer is missing the computed property for movedFrameView, which is:

var movedFrameView:CGRect? {
  get { return objc_getAssociatedObject(self, &AssociatedKeys.movedFrameView) as? CGRect }
  set { objc_setAssociatedObject(self, &AssociatedKeys.movedFrameView, newValue, .OBJC_ASSOCIATION_COPY) }
}