Ios 如何在向自定义显示UIViewController时更改默认转换

我正在尝试从当前视图控制器演示另一个UIViewController。过渡动画设置为默认，显示的UIViewController似乎从下到上显示。但是，我尝试从上到下设置动画。我怎样才能做到这一点？ 我曾尝试使用过渡效果，如封面垂直、翻转水平、交叉溶解，但它们似乎都不符合我的选择。有什么建议我该如何实现这一点

 let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let editCategoryVC: EditCategoryVC = storyboard.instantiateViewControllerWithIdentifier("editCategoryVC")as EditCategoryVC
        self.presentViewController(editCategoryVC, animated:true, completion: nil

---

)我认为以下方法可以奏效

let editCategoryVC = self.storyboard?.instantiateViewControllerWithIdentifier("editCategoryVC") as editCategoryVC
self.presentViewController(editCategoryVC, animated:true, completion: nil

---

我认为以下方法可行

let editCategoryVC = self.storyboard?.instantiateViewControllerWithIdentifier("editCategoryVC") as editCategoryVC
self.presentViewController(editCategoryVC, animated:true, completion: nil

---

我认为以下方法可行

let editCategoryVC = self.storyboard?.instantiateViewControllerWithIdentifier("editCategoryVC") as editCategoryVC
self.presentViewController(editCategoryVC, animated:true, completion: nil

---

我认为以下方法可行

let editCategoryVC = self.storyboard?.instantiateViewControllerWithIdentifier("editCategoryVC") as editCategoryVC
self.presentViewController(editCategoryVC, animated:true, completion: nil

---

处理动画的TransitionHandler帮助程序类

import UIKit

class TransitionHandler : NSObject, UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate  {

    func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }

    func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }

    func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval {

        return 0.9
    }

    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

        let container = transitionContext.containerView
        let fromView = transitionContext.view(forKey: .from)!
        let toView = transitionContext.view(forKey: .to)!

        // e.g to show the animation from x axis change this frame as required
        //   let offScreenUp = CGAffineTransformMakeTranslation(-container.frame.size.width, 0)
        //     let offScreenDown = CGAffineTransformMakeTranslation(container.frame.size.width,0)
        let offScreenUp = CGAffineTransform(translationX: 0, y: 0) // (-container.frame.size.width,0)
        let offScreenDown = CGAffineTransform(translationX: 0, y: container.frame.size.height)
        toView.transform = offScreenUp
        container.addSubview(toView)
        container.addSubview(fromView)
        let duration = self.transitionDuration(using: transitionContext)

        UIView.animate(withDuration: duration, delay: 0.0, usingSpringWithDamping: 0.9, initialSpringVelocity: 0.8, options: [], animations: {

            fromView.transform = offScreenDown
            toView.transform = CGAffineTransform.identity

    }, completion: { finished in

            transitionContext.completeTransition(true)
    })

    }
}

在单击按钮时显示下一个控制器的类

class ViewController: UIViewController {

    let transitionHandler = TransitionHandler()

    @IBAction func showVCAnimation(sender: AnyObject) {

        var storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let nextVC = storyboard.instantiateViewControllerWithIdentifier("editCategoryVC") as EditCategoryVC
        nextVC.transitioningDelegate =  self.transitionHandler
        self.presentViewController(nextVC, animated: true, completion: nil)
    }
}

---

多亏了AppCoda

处理动画的TransitionHandler帮助程序类

import UIKit

class TransitionHandler : NSObject, UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate  {

    func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }

    func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }

    func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval {

        return 0.9
    }

    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

        let container = transitionContext.containerView
        let fromView = transitionContext.view(forKey: .from)!
        let toView = transitionContext.view(forKey: .to)!

        // e.g to show the animation from x axis change this frame as required
        //   let offScreenUp = CGAffineTransformMakeTranslation(-container.frame.size.width, 0)
        //     let offScreenDown = CGAffineTransformMakeTranslation(container.frame.size.width,0)
        let offScreenUp = CGAffineTransform(translationX: 0, y: 0) // (-container.frame.size.width,0)
        let offScreenDown = CGAffineTransform(translationX: 0, y: container.frame.size.height)
        toView.transform = offScreenUp
        container.addSubview(toView)
        container.addSubview(fromView)
        let duration = self.transitionDuration(using: transitionContext)

        UIView.animate(withDuration: duration, delay: 0.0, usingSpringWithDamping: 0.9, initialSpringVelocity: 0.8, options: [], animations: {

            fromView.transform = offScreenDown
            toView.transform = CGAffineTransform.identity

    }, completion: { finished in

            transitionContext.completeTransition(true)
    })

    }
}

在单击按钮时显示下一个控制器的类

class ViewController: UIViewController {

    let transitionHandler = TransitionHandler()

    @IBAction func showVCAnimation(sender: AnyObject) {

        var storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let nextVC = storyboard.instantiateViewControllerWithIdentifier("editCategoryVC") as EditCategoryVC
        nextVC.transitioningDelegate =  self.transitionHandler
        self.presentViewController(nextVC, animated: true, completion: nil)
    }
}

---

多亏了AppCoda

处理动画的TransitionHandler帮助程序类

import UIKit

class TransitionHandler : NSObject, UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate  {

    func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }

    func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }

    func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval {

        return 0.9
    }

    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

        let container = transitionContext.containerView
        let fromView = transitionContext.view(forKey: .from)!
        let toView = transitionContext.view(forKey: .to)!

        // e.g to show the animation from x axis change this frame as required
        //   let offScreenUp = CGAffineTransformMakeTranslation(-container.frame.size.width, 0)
        //     let offScreenDown = CGAffineTransformMakeTranslation(container.frame.size.width,0)
        let offScreenUp = CGAffineTransform(translationX: 0, y: 0) // (-container.frame.size.width,0)
        let offScreenDown = CGAffineTransform(translationX: 0, y: container.frame.size.height)
        toView.transform = offScreenUp
        container.addSubview(toView)
        container.addSubview(fromView)
        let duration = self.transitionDuration(using: transitionContext)

        UIView.animate(withDuration: duration, delay: 0.0, usingSpringWithDamping: 0.9, initialSpringVelocity: 0.8, options: [], animations: {

            fromView.transform = offScreenDown
            toView.transform = CGAffineTransform.identity

    }, completion: { finished in

            transitionContext.completeTransition(true)
    })

    }
}

在单击按钮时显示下一个控制器的类

class ViewController: UIViewController {

    let transitionHandler = TransitionHandler()

    @IBAction func showVCAnimation(sender: AnyObject) {

        var storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let nextVC = storyboard.instantiateViewControllerWithIdentifier("editCategoryVC") as EditCategoryVC
        nextVC.transitioningDelegate =  self.transitionHandler
        self.presentViewController(nextVC, animated: true, completion: nil)
    }
}

---

多亏了AppCoda

处理动画的TransitionHandler帮助程序类

import UIKit

class TransitionHandler : NSObject, UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate  {

    func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }

    func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        return self
    }

    func transitionDuration(transitionContext: UIViewControllerContextTransitioning) -> NSTimeInterval {

        return 0.9
    }

    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

        let container = transitionContext.containerView
        let fromView = transitionContext.view(forKey: .from)!
        let toView = transitionContext.view(forKey: .to)!

        // e.g to show the animation from x axis change this frame as required
        //   let offScreenUp = CGAffineTransformMakeTranslation(-container.frame.size.width, 0)
        //     let offScreenDown = CGAffineTransformMakeTranslation(container.frame.size.width,0)
        let offScreenUp = CGAffineTransform(translationX: 0, y: 0) // (-container.frame.size.width,0)
        let offScreenDown = CGAffineTransform(translationX: 0, y: container.frame.size.height)
        toView.transform = offScreenUp
        container.addSubview(toView)
        container.addSubview(fromView)
        let duration = self.transitionDuration(using: transitionContext)

        UIView.animate(withDuration: duration, delay: 0.0, usingSpringWithDamping: 0.9, initialSpringVelocity: 0.8, options: [], animations: {

            fromView.transform = offScreenDown
            toView.transform = CGAffineTransform.identity

    }, completion: { finished in

            transitionContext.completeTransition(true)
    })

    }
}

在单击按钮时显示下一个控制器的类

class ViewController: UIViewController {

    let transitionHandler = TransitionHandler()

    @IBAction func showVCAnimation(sender: AnyObject) {

        var storyboard : UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let nextVC = storyboard.instantiateViewControllerWithIdentifier("editCategoryVC") as EditCategoryVC
        nextVC.transitioningDelegate =  self.transitionHandler
        self.presentViewController(nextVC, animated: true, completion: nil)
    }
}

---

多亏了AppCoda

检查此答案：检查此答案：检查此答案：检查此答案：这就是问题所在。显示视图控制器时，带有此代码的动画从下到上。我想要从上到下的动画这就是问题所在。这段代码的动画在显示视图控制器时从下到上。我想要从上到下的动画这就是问题所在。这段代码的动画在显示视图控制器时从下到上。我想要从上到下的动画这就是问题所在。这段代码的动画在显示视图控制器时从下到上。我想要从上到下的动画