Swift自定义转场动画

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`1.通过storyBoard加载控制器`

    let sb = UIStoryboard(name: "WYPopViewController", bundle: nil)    // 1.需要勾选箭头    let vc = sb.instantiateInitialViewController()!    // 2.通过id加载    let vc = sb.instantiateViewControllerWithIdentifier("123")

`2.设置代理`

     // 设置代理    vc.transitioningDelegate = popAnimation    //    vc.modalPresentationStyle = .Custom    // 3.弹出控制器    presentViewController(vc, animated: true, completion: nil)

`3.准守协议，实现方法（UIViewControllerTransitioningDelegate,UIViewControllerAnimatedTransitioning）`

负责转场动画的控制器

  // iOS8之后推出的 告诉系统谁来负责转场动画  func presentationControllerForPresentedViewController(presented: UIViewController, presentingViewController presenting: UIViewController, sourceViewController source: UIViewController) -> UIPresentationController? {      let pop = WYPopPresentationController(presentedViewController: presented, presentingViewController: presenting)      pop.presentFrame = presentFrame      return pop  }

告诉系统谁来负责Modal的展现动画

  // MARK: - 只要实现了以下方法, 那么系统自带的默认动画就没有了, "所有"东西都需要程序员自己来实现  /**  :param: presented  被展现视图  :param: presenting 发起的视图  :returns: 谁来负责  */  func animationControllerForPresentedController(presented: UIViewController, presentingController presenting: UIViewController, sourceController source: UIViewController) -> UIViewControllerAnimatedTransitioning? {      isPresent = true      // 发出通知，箭头朝上      NSNotificationCenter.defaultCenter().postNotificationName(PopViewWillShow, object: nil)      return self  }

告诉系统谁来负责动画的消失

  /**   - parameter dismissed: 被关闭的视图   - returns:   */  func animationControllerForDismissedController(dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {      isPresent = false      // 发出通知，箭头朝下        NSNotificationCenter.defaultCenter().postNotificationName(PopViewWillDismiss, object: nil)      return self  }

UIViewControllerAnimatedTransitioning的代理方法

  /**  返回动画时长  :param: transitionContext 上下文, 里面保存了动画需要的所有参数  :returns: 动画时长  */  func transitionDuration(transitionContext: UIViewControllerContextTransitioning?) -> NSTimeInterval {      return 0.5  }

告诉系统如何动画, 无论是展现还是消失都会调用这个方法

    /**     :param: transitionContext 上下文, 里面保存了动画需要的所有参数     */    func animateTransition(transitionContext: UIViewControllerContextTransitioning) {        if isPresent{            //print("展开")            let toView = transitionContext.viewForKey(UITransitionContextToViewKey)            toView?.transform = CGAffineTransformMakeScale(1.0, 0.0)            // 将试图添加到容器中            transitionContext.containerView()?.addSubview(toView!)            // 修改锚点            toView?.layer.anchorPoint = CGPointMake(0.5, 0)            // 执行动画            UIView.animateWithDuration(0.5, animations: { () -> Void in                toView?.transform = CGAffineTransformIdentity                }) { (_) -> Void in                    transitionContext.completeTransition(true)            }        }else{            //print("关闭")            let formView = transitionContext.viewForKey(UITransitionContextFromViewKey)            UIView.animateWithDuration(0.5, animations: { () -> Void in                formView?.transform = CGAffineTransformMakeScale(1.0, 0.001)                }, completion: { (_) -> Void in                    transitionContext.completeTransition(true)            })        }    }

`4.自定义转场控制器`

 // 展示视图的尺寸    var presentFrame = CGRectZero    /**     - parameter presentedViewController:  被展示的控制器     - parameter presentingViewController: 执行转场的控制器     */    override init(presentedViewController: UIViewController, presentingViewController: UIViewController) {        super.init(presentedViewController: presentedViewController, presentingViewController: presentingViewController)    }    /**     即将布局转场子视图时调用     */    override func containerViewWillLayoutSubviews() {        // 设置展现视图的尺寸        if presentFrame == CGRectZero{        presentedView()?.frame = CGRectMake(100, 60, 200, 300)        }else{            presentedView()?.frame = presentFrame        }        // 在容器上添加一个蒙版,用来移除modal出来的控制器        containerView?.insertSubview(cover, atIndex: 0)    }    func close () {            presentedViewController.dismissViewControllerAnimated(true, completion: nil)    }    private lazy var cover : UIView = {        let cover = UIView()        // 设置尺寸        cover.frame = UIScreen.mainScreen().bounds        // 颜色        cover.backgroundColor = UIColor.clearColor()        // 添加手势        let tap = UITapGestureRecognizer(target: self, action: "close")        cover.addGestureRecognizer(tap)        return cover    }()

效果图：

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