没什么事研究了一下自定义ViewController切换动画，主要就是主ViewController实现UIViewControllerTransitioningDelegate协议中的
显示：
optional public func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning?,
隐藏：
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning?
两个代理方法，在两个代理方法中返回实现了UIViewControllerAnimatedTransitioning协议的两个方法的自定义动画对象，闲话少絮，直接上代码，参照官方案例写的代码，做了小小的改动
//主ViewController
class ViewController： UITableViewController, UIViewControllerTransitioningDelegate{
//.....需要在ViweDidload方法中设置navgationCroller的dalegate为主ViewController
//tableView代理方法，点击cell 使用present方式显示控制器
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let controller = AniTestViewController() //要显示的VC实例
//设置代理为主VC
controller.transitioningDelegate = self
self.present(controller, animated: true, completion: nil)
}
//显示vc代理方法
func animationController(forPresented presented: UIViewController, presenting: UIViewController, source: UIViewController) -> UIViewControllerAnimatedTransitioning? {
let aminator = MyAnimator(presenting: true)
return aminator
}
//隐藏vc代理方法
func animationController(forDismissed dismissed: UIViewController) -> UIViewControllerAnimatedTransitioning? {
let animator = MyAnimator(presenting: false)
return animator
}
//navgationController代理方法，如果有navgationController的话
func navigationController(_ navigationController: UINavigationController, animationControllerFor operation: UINavigationControllerOperation, from fromVC: UIViewController, to toVC: UIViewController) -> UIViewControllerAnimatedTransitioning? {
if operation == .push {
let aminator = MyAnimator(presenting: true)
return aminator
}else if operation == .pop{
let aminator = MyAnimator(presenting: false)
return aminator
}
return nil;
}
}
//实现UIViewControllerAnimatedTransitioning协议的类，可以是任何类
class MyAnimator: NSObject, UIViewControllerAnimatedTransitioning{
//在初始化方法中设置初始值，用以判断是显示还是隐藏vc
var presenting:Bool = true
init(presenting: Bool) {
super.init()
self.presenting = presenting
}
//代理方法，返回动画执行时间
func transitionDuration(using transitionContext: UIViewControllerContextTransitioning?) -> TimeInterval {
return 0.5
}
//动画执行方法，用以写动画执行过程
func animateTransition(using transitionContext: UIViewControllerContextTransitioning) {
//通过transitionContext获取用来执行动画的View
let containerView = transitionContext.containerView
//要从哪个vc跳转，比如在A_ViewController中要显示B_ViewController， fromVC就是A
let fromVC = transitionContext.viewController(forKey: .from)
//要从跳转到哪个VC，比如在A_ViewController中要显示B_ViewController， toVC就是B
let toVC = transitionContext.viewController(forKey: .to)
//如果已经在A中执行过present，要dismiss掉B的时候，那么A为toVC，B为fromVC
//toView与fromView可以按toVC和fromVC的方式理解，也就是即将要显示的那个View叫做toView，现在显示的View叫做fromView
let toView = transitionContext.view(forKey: .to)
let fromView = transitionContext.view(forKey: .from)
//获取动画的各个frame
//containerFrame，动画执行所在的区域，也就是ScreenBounds
let containerFrame = containerView.frame
//要显示的VC开始所在的位置大小，默认（x:0, y:0, width:0, Height:0）
var toViewStartFrame = transitionContext.initialFrame(for: toVC!)
//要显示的VC最终要移动到的位置大小，默认（x:0, y:0, width:ScreenWidth, Height:ScreenHeight）
let toViewFinalFrame = transitionContext.finalFrame(for: toVC!)
//现在显示的VC最终的位置大小，默认（x:0, y:0, width:0, Height:0）
var fromViewFinalFrame = transitionContext.finalFrame(for: fromVC!)
containerView.addSubview(toView!)
//判断是显示还是隐藏
if self.presenting{
//显示
//设置 toViewStartFrame用以初始化要显示VC的初始位置
toViewStartFrame.origin.x = containerFrame.size.width
toViewStartFrame.origin.y = containerFrame.size.height
toView?.frame = toViewStartFrame
}else{
//如果是隐藏
//设置现在显示的VC动画结束的位置
fromViewFinalFrame = CGRect.init(x: containerFrame.size.width, y: containerFrame.size.height, width:(toView?.frame.size.width)!, height:(toView?.frame.size.height)!);
//设置要显示View的frame为当前显示的View的位置，并将其移动到但钱view的下面
toView?.frame = toViewFinalFrame
containerView.bringSubview(toFront: fromView!)
}
//执行动画
UIView.animate(withDuration: self.transitionDuration(using:transitionContext), animations: {
if self.presenting{
//如果是显示的话那么就设置要显示的View的动画结束位置，UIView会自动执行动画
toView?.frame = toViewFinalFrame
}else{
//移除的时候设置现在显示的View的动画结束位置
fromView?.frame = fromViewFinalFrame
}
//当然，如果你愿意的话可以自己设置各种各样的动画效果，以满足需求
}) { (finshed) in
//动画结束如果失败的话则需要将要显示的view移除掉
let success = !transitionContext.transitionWasCancelled
if self.presenting && !success || !self.presenting && success{
toView?.removeFromSuperview()
}
//告诉UIKit动画执行结束了，以执行之后的操作
transitionContext.completeTransition(success)
}
}
}
动画效果就是这个样子的：：：
自定义动画
