Tab bar extension for hiding and showing tab bars in certain view controllers

UITabBarExtension.swift

/// Extension written by: @BrentMifsud, usage and slight modification by @tesddev
extension UITabBarController {
    /// Extends the size of the `UITabBarController` view frame, pushing the tab bar controller off screen.
    /// - Parameters:
    ///   - hidden: Hide or Show the `UITabBar`
    ///   - animated: Animate the change
    func setTabBarHidden(_ hidden: Bool, animated: Bool) {
        guard let vc = selectedViewController else { return }
        guard tabBarHidden != hidden else { return }
        
        let frame = self.tabBar.frame
        let height = frame.size.height
        let offsetY = hidden ? height : -height

        UIViewPropertyAnimator(duration: animated ? 0.2 : 0, curve: .easeOut) {
            self.tabBar.frame = self.tabBar.frame.offsetBy(dx: 0, dy: offsetY)
            self.selectedViewController?.view.frame = CGRect(
                x: 0,
                y: 0,
                width: vc.view.frame.width,
                height: vc.view.frame.height + offsetY
            )
            
            self.view.setNeedsDisplay()
            self.view.layoutIfNeeded()
        }
        .startAnimation()
    }
    
    /// Is the tab bar currently off the screen.
    private var tabBarHidden: Bool {
        tabBar.frame.origin.y >= UIScreen.main.bounds.height
    }
}

/// TO USE
self.tabBarController?.setTabBarHidden(true, animated: true)

/// It is advisable to put in the ViewWillAppear of view controllers in which the tab bars always show.
/// This will return the tab bar in case you pop the view controller.

override func viewWillAppear(_ animated: Bool) {
    self.tabBarController?.setTabBarHidden(false, animated: false)
}