How do I hide/show tabBar when tapped using Swift in iOS8

Question

I am trying to mimic the UINavigationController\'s new hidesBarsOnTap with a tab bar. I have seen many answers to this that either point to setting the hi

Answer 1

Swift 3 version:

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:TimeInterval = (animated ? 0.3 : 0.0)

    //  animate the tabBar
    if frame != nil {
        UIView.animate(withDuration: duration) {

            self.tabBarController?.tabBar.frame = (self.tabBarController?.tabBar.frame.offsetBy(dx: 0, dy: offsetY!))!
            return
        }
    }
}

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

Answer 2

Code is okay but when you use presentViewController, tabBarIsVisible() is not working. To keep UITabBarController always hidden use just this part:

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()
        }
    }
}

Answer 3

To make the animations work with self.tabBarController?.tabBar.hidden = true just do this:

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

Other than the other solution this will also work nicely with autolayout.

Answer 4

You can just add this line to ViewDidLoad() in swift :

self.tabBarController?.tabBar.hidden = true