ios - UIView、Swift 上的深度页面转换

Question

如何创建像这样的深度页面变换动画(从上到下，从下到上)https://youtu.be/c2ccXwwmcnA .我在 Google 中搜索过，但我不知道如何在 iOS 中实现。

示例输出如下:

Answer 1

我遵循了教程 Animated Transitions in Swift我得到了这个效果:

如果你不想阅读整个教程，基本上你必须这样做:

1。创建 TrasitionManager 类

//
//  TransitionManager.swift
//  Aleph Retamal
//
//  Created by Aleph Retamal on 4/19/15.
//  Copyright (c) 2015 Aleph Retamal. All rights reserved.
//

import UIKit

class TransitionManager: NSObject, UIViewControllerAnimatedTransitioning, UIViewControllerTransitioningDelegate  {

    private var presenting:Bool = true
    var leftSide:Bool = true

    // MARK: UIViewControllerAnimatedTransitioning protocol methods

    // animate a change from one viewcontroller to another
    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {

        // get reference to our fromView, toView and the container view that we should perform the transition in
        let container = transitionContext.containerView()
        let fromView = transitionContext.viewForKey(UITransitionContextFromViewKey)!
        let toView = transitionContext.viewForKey(UITransitionContextToViewKey)!


        let offScreenRight = CGAffineTransformConcat(CGAffineTransformMakeTranslation(container!.frame.width, 0), CGAffineTransformMakeScale(0.1, 0.1))
        let offScreenLeft = CGAffineTransformMakeTranslation(-container!.frame.width, 0)

        // start the toView to the right of the screen
        if !leftSide {
            if self.presenting {
                toView.transform = offScreenRight
            } else {
                toView.transform = offScreenLeft
            }
        } else {
            if self.presenting {
                toView.transform = offScreenLeft
            } else {
                toView.transform = offScreenRight
            }
        }

        // add the both views to our view controller
        container!.addSubview(toView)
        container!.addSubview(fromView)

        // get the duration of the animation
        // DON'T just type '0.5s' -- the reason why won't make sense until the next post
        // but for now it's important to just follow this approach
        let duration = self.transitionDuration(transitionContext)

        // perform the animation!
        // for this example, just slid both fromView and toView to the left at the same time
        // meaning fromView is pushed off the screen and toView slides into view
        // we also use the block animation usingSpringWithDamping for a little bounce
        UIView.animateWithDuration(duration, animations: { () -> Void in
            if !self.leftSide {
                if self.presenting {
                    fromView.transform = offScreenLeft
                } else {
                    container!.sendSubviewToBack(fromView)
                    fromView.transform = offScreenRight
                }
            } else {
                if self.presenting {
                    fromView.transform = offScreenRight
                    container!.sendSubviewToBack(fromView)
                } else {
                    fromView.transform = offScreenLeft
                }
            }

            toView.transform = CGAffineTransformIdentity
            }) { (finished) -> Void in
                // tell our transitionContext object that we've finished animating
                transitionContext.completeTransition(true)
        }

    }

    // return how many seconds the transiton animation will take
    func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {
        return 1.0
    }

    // MARK: UIViewControllerTransitioningDelegate protocol methods

    // return the animataor when presenting a viewcontroller
    // remmeber that an animator (or animation controller) is any object that aheres to the UIViewControllerAnimatedTransitioning protocol
    func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        self.presenting = true
        return self
    }

    // return the animator used when dismissing from a viewcontroller
    func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
        self.presenting = false
        return self
    }

}

这是您设置 View 应如何转换的地方

let offScreenRight = CGAffineTransformConcat(CGAffineTransformMakeTranslation(container!.frame.width, 0), CGAffineTransformMakeScale(0.1, 0.1))
let offScreenLeft = CGAffineTransformMakeTranslation(-container!.frame.width, 0)

在这种情况下，一个 View 会翻译 + 缩放，而另一个 View 只会翻译

2。在你的 ViewController

中实例化 TransitionManager

let transitionManager = TransitionManager()

3。设置转换委托(delegate)

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    transitionManager.leftSide = false
    let toViewController = segue.destinationViewController
    toViewController.transitioningDelegate = self.transitionManager
}

如果您希望 View 来自右侧，leftSide = false

transitionManager.leftSide = false

就是这样!

编辑:

实现这个效果:

这是项目的 git:https://github.com/alaphao/indepth

使用约束来对齐和调整大小:

1. 创建 2 个与其父 View 具有相同宽度/高度的 View

2. 将两者与CenterX

   对齐

3. 设置与底部的距离 = 0 并为约束创建导出

4. 创建一个PanGestureRecognizer

5. 根据平移 translationInView.y

为前 View 底部约束设置动画