自定義視圖過渡，無需使用情節提要segue（快速）

Question

我有兩種觀點，我想在整個過程中進行滑動樣式過渡，並且我已經完成了這一工作，但是要在其中進行操作，但是我在這里沒有一個觀點，因此不確定如何應用動畫類。 我在課堂上擁有的一切是：

let stb = UIStoryboard(name: "Walkthrough", bundle: nil)
    let walkthrough = stb.instantiateViewControllerWithIdentifier("walk") as! BWWalkthroughViewController

self.presentViewController(walkthrough, animated: true, completion: nil)

我想應用以下自定義segue：

class CustomSegue: UIStoryboardSegue {

  override func perform() {
    // Assign the source and destination views to local variables.
    var firstVCView = self.sourceViewController.view as UIView!
    var secondVCView = self.destinationViewController.view as UIView!

    // Get the screen width and height.
    let screenWidth = UIScreen.mainScreen().bounds.size.width
    let screenHeight = UIScreen.mainScreen().bounds.size.height

    // Specify the initial position of the destination view.
    secondVCView.frame = CGRectMake(0.0, screenHeight, screenWidth, screenHeight)

    // Access the app's key window and insert the destination view above the current (source) one.
    let window = UIApplication.sharedApplication().keyWindow
    window?.insertSubview(secondVCView, aboveSubview: firstVCView)

    // Animate the transition.
    UIView.animateWithDuration(0.2, animations: { () -> Void in
      firstVCView.frame = CGRectOffset(firstVCView.frame, -screenWidth, 0.0)
      secondVCView.frame = CGRectOffset(secondVCView.frame, -screenWidth, 0.0)

      }) { (Finished) -> Void in

      self.sourceViewController.presentViewController(self.destinationViewController as! UIViewController,
          animated: false,
          completion:nil)
    }
  }
}

我不能讓它工作任何指針嗎？

Answer 1

雖然第一個答案應該是“使用Storyboard Segues”，但是您可以通過以下方式解決自定義轉換：

通用方法

1. 修改您的CustomSegue采用兩種 UIStoryboardSegue 和 UIViewControllerAnimatedTransitioning協議。
2. 重構CustomSegue以便兩種協議都可以使用動畫。
3. 設置一個到導航控制器的delegate可以是導航控制器本身），以提供用於push和pop的自定義過渡
4. 讓animationControllerForOperation創建並返回CustomSegue的實例，該實例具有您選擇的標識符。

總覽

// Adopt both protocols
class CustomSegue: UIStoryboardSegue, UIViewControllerAnimatedTransitioning {

    func animate(firstVCView:UIView,
        secondVCView:UIView,
        containerView:UIView,
        transitionContext: UIViewControllerContextTransitioning?) {
            // factored transition code goes here
                }) { (Finished) -> Void in
                    if let context = transitionContext {
                        // UIViewControllerAnimatedTransitioning
                    } else {
                        // UIStoryboardSegue
                    }
            }
    }

    func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval {
        // return timing
    }

    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
        // Perform animate using transitionContext information
        // (UIViewControllerAnimatedTransitioning)
    }

    override func perform() {
        // Perform animate using segue (self) variables
        // (UIStoryboardSegue) 
    }
}

---

下面是完整的代碼示例。 已經過測試。 請注意，我還修復了原始問題中的一些動畫錯誤，並添加了淡入效果以強調動畫。

---

CustomSegue類

// Animation for both a Segue and a Transition
class CustomSegue: UIStoryboardSegue, UIViewControllerAnimatedTransitioning {

    func animate(firstVCView:UIView,
        secondVCView:UIView,
        containerView:UIView,
        transitionContext: UIViewControllerContextTransitioning?) {

            // Get the screen width and height.
            let offset = secondVCView.bounds.width

            // Specify the initial position of the destination view.
            secondVCView.frame = CGRectOffset(secondVCView.frame, offset, 0.0)

            firstVCView.superview!.addSubview(secondVCView)
            secondVCView.alpha = 0;

            // Animate the transition.
            UIView.animateWithDuration(self.transitionDuration(transitionContext!),
                animations: { () -> Void in
                    firstVCView.frame = CGRectOffset(firstVCView.frame, -offset, 0.0)
                    secondVCView.frame = CGRectOffset(secondVCView.frame, -offset, 0.0)
                    secondVCView.alpha = 1; // emphasis

                }) { (Finished) -> Void in
                    if let context = transitionContext {
                        context.completeTransition(!context.transitionWasCancelled())
                    } else {
                        self.sourceViewController.presentViewController(
                            self.destinationViewController as! UIViewController,
                            animated: false,
                            completion:nil)
                    }
            }
    }

    func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval {
        return 4 // four seconds
    }

    // Perform Transition (UIViewControllerAnimatedTransitioning)
    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {
        self.animate(transitionContext.viewControllerForKey(UITransitionContextFromViewControllerKey)!.view,
            secondVCView: transitionContext.viewControllerForKey(UITransitionContextToViewControllerKey)!.view,
            containerView: transitionContext.containerView(),
            transitionContext: transitionContext)
    }

    // Perform Segue (UIStoryboardSegue)
    override func perform() {
        self.animate(self.sourceViewController.view!!,
            secondVCView: self.destinationViewController.view!!,
            containerView: self.sourceViewController.view!!.superview!,
            transitionContext:nil)
    }
}

主機ViewController類

class ViewController: UIViewController, UINavigationControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        self.navigationController?.delegate = self
    }

    func navigationController(navigationController: UINavigationController, animationControllerForOperation operation: UINavigationControllerOperation, fromViewController fromVC: UIViewController, toViewController toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        switch operation {
        case .Push:
             return CustomSegue(identifier: "Abc", source: fromVC, destination: toVC)

        default:
            return nil
        }
    }
}