swift – 用动画交换rootViewController？

我试图用标签栏交换到另一个根视图控制器;通过应用程序委托，我想添加过渡动画。默认情况下，它只显示没有任何动画的视图。

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()

这就是我交换到另一个rootview控制器的方式。

我前段时间评估过UIView.transition(来自：view，to：view)和UIView.transition(带有：view)并最终使用了这个:(但遗憾的是不记得为什么)

guard let window = UIApplication.shared.keyWindow else {
    return
}

guard let rootViewController = window.rootViewController else {
    return
}

let storyboard = UIStoryboard(name: "Main",bundle: nil)
let vc = storyboard.instantiateViewController(withIdentifier: "MainTabbar")
vc.view.frame = rootViewController.view.frame
vc.view.layoutIfNeeded()

UIView.transition(with: window,duration: 0.3,options: .transitionCrossdissolve,animations: {
    window.rootViewController = vc
},completion: { completed in
    // maybe do something here
})

swift – 用动画交换rootViewController？

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