swift中基本转场动画.

概述//-----------------------------------------------------在一个控制器中实现代码--------------------------------------------------------------------             //默认的Modal，会将上一级的视图移走             let photoBrowserCon

//-----------------------------------------------------在一个控制器中实现代码--------------------------------------------------------------------

//默认的Modal，会将上一级的视图移走
let photobrowserController = PhotobrowserController(urls: urls,indexPaht: indexPath)

//指定动画的提供者，TransitioningDelegate 隐式动画。
photobrowserController.TransitioningDelegate = self?.photobrowserAnimator

//指定Model的样式是自定义的
photobrowserController.modalPresentationStyle = UIModalPresentationStyle.Custom
self?.presentVIEwController(photobrowserController,animated: false,completion: nil)

//-----------------------------------------------------定义转场动画类----------------------------------------------------------------------

import UIKit

/// 专门给控制器提供 ‘转场’ 的动画模型 class PhotobrowserAnimator: NSObject,UIVIEwControllerTransitioningDelegate { //是否展示动画 var isPresent = false /// 返回提供展现 Presented 转场动画的对象 func animationControllerForPresentedController(presented: UIVIEwController,presentingController presenting: UIVIEwController,sourceController source: UIVIEwController) -> UIVIEwControllerAnimatedTransitioning? { isPresent = true return self } /// 返回消失时 dismissed 转场动画的对象 func animationControllerFordismissedController(dismissed: UIVIEwController) -> UIVIEwControllerAnimatedTransitioning? { isPresent = false return self } } extension PhotobrowserAnimator: UIVIEwControllerAnimatedTransitioning{ /// '转场'时长 /// /// - parameter TransitionContext: Transition［转场］Context 上下文 /// /// - returns: 时长 func TransitionDuration(TransitionContext: UIVIEwControllerContextTransitioning?) -> NSTimeInterval { return 0.5 } /// 实现专场动画效果 - 一旦实现这个方法，必须完成动画效果 /// /// - parameter TransitionContext: Transition［转场］Context 提供一转场动画效果的一切细节 func animateTransition(TransitionContext: UIVIEwControllerContextTransitioning) { isPresent ? presentAnimation(TransitionContext) : dismissAnimation(TransitionContext) } /// 消失时动画 /// /// - parameter TransitionContext: TransitionContext private func dismissAnimation(TransitionContext: UIVIEwControllerContextTransitioning){ let fromVIEw = TransitionContext.vIEwControllerForKey(UITransitionContextFromVIEwControllerKey)?.vIEw UIVIEw.animateWithDuration(TransitionDuration(TransitionContext),animations: { () -> VoID in fromVIEw?.Alpha = 0 }) { (_) -> VoID in fromVIEw?.removeFromSupervIEw() TransitionContext.completeTransition(true) } } /// 出现时动画 /// /// - parameter TransitionContext: TransitionContext private func presentAnimation(TransitionContext: UIVIEwControllerContextTransitioning){ //展示动哈 let toVIEw = TransitionContext.vIEwControllerForKey(UITransitionContextToVIEwControllerKey)!.vIEw toVIEw.Alpha = 0 //获取容器视图 let containerVIEw = TransitionContext.containerVIEw() //将视图添加到容器视图上才能看到动画效果 containerVIEw?.addSubvIEw(toVIEw) UIVIEw.animateWithDuration(TransitionDuration(TransitionContext),animations: { () -> VoID in toVIEw.Alpha = 0 }) { (_ ) -> VoID in //动画完成后要声明方式 TransitionContext.completeTransition(true) } } } 总结

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