Swift UITabBarController hide with animation

问题

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.

回答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.

回答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
    }

}

回答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
                    }
                }
            }
        }
    }
}

}

回答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
    }
}

回答5:

Swift 4 solution:

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

回答6:

You have to add UIView transitionWithView class func

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

来源：https://stackoverflow.com/questions/41169966/swift-uitabbarcontroller-hide-with-animation

标签

ios

swift

uitabbarcontroller