我试图用一个选项卡栏切换到另一个根视图控制器；通过app delegate，我想添加过渡动画.默认情况下，它只显示视图，不显示任何动画.
let tabBar = self.instantiateViewController(storyBoard: "Main", viewControllerID: "MainTabbar")
let appDelegate = UIApplication.shared.delegate as! AppDelegate
appDelegate.window = UIWindow(frame: UIScreen.main.bounds)
appDelegate.window?.rootViewController = tabBar
appDelegate.window?.makeKeyAndVisible()
这就是我切换到另一个rootview控制器的方式.
您可以使用UIView.transition(with: view)替换UIWindow中的rootViewController:
guard let window = UIApplication.shared.keyWindow else {
return
}
let storyboard = UIStoryboard(name: "Main", bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "MainTabbar")
// Set the new rootViewController of the window.
// Calling "UIView.transition" below will animate the swap.
window.rootViewController = vc
// A mask of options indicating how you want to perform the animations.
let options: UIView.AnimationOptions = .transitionCrossDissolve
// The duration of the transition animation, measured in seconds.
let duration: TimeInterval = 0.3
// Creates a transition animation.
// Though `animations` is optional, the documentation tells us that it must not be nil. ¯\_(ツ)_/¯
UIView.transition(with: window, duration: duration, options: options, animations: {}, completion:
{ completed in
// maybe do something on completion here
})