添加帶AutoLayout內容的UIViewController時，內容動畫無法正常工作

Question

我有一個UIViewController，我將其作爲子視圖添加到我的iPad應用程序中。 UIViewcontroller有一個UITableView，它根據故事板中設置的自動佈局調整大小。我想顯示從iPad的中央到右端（橫向模式）移動此視圖的動畫。爲此，我將寬度初始設置爲0並將其增加到動畫塊中。儘管動畫效果很好，但UIViewController中的tableview在動畫之前添加。所以它不動畫。 IT也應該擴展其父（UIViewController）。我的代碼：

@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

看起來你是在告訴您的通知視圖控制器其寬度動畫爲0和570兩個動畫塊內，嘗試刪除幀更改設置寬度爲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 

    }) 
}