添加带AutoLayout内容的UIViewController时，内容动画无法正常工作

Question

我有一个UIViewController，我将其作为子视图添加到我的iPad应用程序中。 UIViewcontroller有一个UITableView，它根据故事板中设置的自动布局调整大小。我想显示从iPad的中央到右端（横向模式）移动此视图的动画。为此，我将宽度初始设置为0并将其增加到动画块中。尽管动画效果很好，但UIViewController中的tableview在动画之前添加。所以它不动画。 IT也应该扩展其父（UIViewController）。我的代码：

@IBAction func tappedNotifications(_ sender: UIButton) { 
    let storyboard = UIStoryboard(name: "Content_iPad", bundle: nil) 
    let notificationSettingsVC = storyboard.instantiateViewController(withIdentifier:"SettingsViewController_iPad") 
    notificationSettingsVC.view.frame = CGRect(x: 380, y: 0, width: 0, height: 775) 
    self.view.addSubview(notificationSettingsVC.view) 
    notificationSettingsVC.didMove(toParentViewController: self) 

    UIView.animate(withDuration: 0.7, animations: { 
     notificationSettingsVC.view.frame = CGRect(x: 380, y: 0, width: 0, height: 775) 
     notificationSettingsVC.view.frame = CGRect(x: 380, y: 0, width: 570, height: 775) 
     notificationSettingsVC.view.setNeedsLayout() 
    }, completion: { 
     (completed) -> Void in 

    }) 
} 

Answer 1

看起来你是在告诉您的通知视图控制器其宽度动画为0和570两个动画块内，尝试删除帧更改设置宽度为0

@IBAction func tappedNotifications(_ sender: UIButton) { 
    let storyboard = UIStoryboard(name: "Content_iPad", bundle: nil) 
    let notificationSettingsVC = storyboard.instantiateViewController(withIdentifier:"SettingsViewController_iPad") 
    notificationSettingsVC.view.frame = CGRect(x: 380, y: 0, width: 0, height: 775) 
    self.view.addSubview(notificationSettingsVC.view) 
    notificationSettingsVC.didMove(toParentViewController: self) 

    UIView.animate(withDuration: 0.7, animations: { 
     notificationSettingsVC.view.frame = CGRect(x: 380, y: 0, width: 570, height: 775) 
     notificationSettingsVC.view.setNeedsLayout() 
    }, completion: { 
     (completed) -> Void in 

    }) 
}