demo.gif
给UIViewController单独的写了个类扩展
使用示例
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
setTabBarVisible(visible: true, animated: true)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
setTabBarVisible(visible: false, animated: true)
}
extension UIViewController{
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 = 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 let rect = frame {
UIView.animate(withDuration: duration) {
self.tabBarController?.tabBar.frame = rect.offsetBy(dx: 0, dy: offsetY!)
return
}
}
}
var tabBarIsVisible: Bool {
return (tabBarController?.tabBar.frame.minY)! < view.frame.maxY
}
}
