iOS 控制器自定义动画跳转方法(模态跳转)

参考资料：

apple 开发文档 customizing the transition animations

wwdc 2013 custom transitions using view controllers

图例：

跳转的动画有很多，全部可以自定义

创建自定义跳转必须遵循的三个步骤:

1、创建一个类,并实现了 uiviewcontrolleranimatedtransitioning 协议

2、创建一个类作为 uiviewcontrollertransitioningdelegate 过渡代理

3、在模态跳转前修改控制器的 transitioningdelegate 代理为自定义的代理（步骤2的代理类）

核心代码示例

一、创建一个类，并实现了 uiviewcontrolleranimatedtransitioning 协议

这个协议主要控制控制器视图的显示的，通过 transitioncontext 可以获取到每个视图和控制器，并进行动画的设置

class animatedtransitioning: nsobject {
 var ispresenting: bool = false
}
extension animatedtransitioning: uiviewcontrolleranimatedtransitioning {
 func transitionduration(using transitioncontext: uiviewcontrollercontexttransitioning?) -> timeinterval {
 return 0.5
 }
 func animatetransition(using transitioncontext: uiviewcontrollercontexttransitioning) {
 let fromview = transitioncontext.view(forkey: .from)!
 let toview = transitioncontext.view(forkey: .to)!
 let containerview = transitioncontext.containerview
 if ispresenting {
  toview.transform = cgaffinetransform(scalex: 0, y: 0)
  containerview.addsubview(toview)
 } else {
  containerview.insertsubview(toview, belowsubview: fromview)
 }
 uiview.animate(withduration: 0.5, animations: {
  if self.ispresenting {
  toview.transform = cgaffinetransform.identity
  } else {
  fromview.transform = cgaffinetransform(scalex: 0.001, y: 0.001)
  }
 }) { (finished) in
  transitioncontext.completetransition(finished)
 }
 }
}

二、创建一个类作为 uiviewcontrollertransitioningdelegate 过渡代理

这里设置 presented 和 dismissed 时各自的动画转换类，可以设置为不同的类

class customtransitioningdelegate: nsobject, uiviewcontrollertransitioningdelegate {
 func animationcontroller(forpresented presented: uiviewcontroller, presenting: uiviewcontroller, source: uiviewcontroller) -> uiviewcontrolleranimatedtransitioning? {
 let at = animatedtransitioning()
 at.ispresenting = true
 return at
 }
 func animationcontroller(fordismissed dismissed: uiviewcontroller) -> uiviewcontrolleranimatedtransitioning? {
 let at = animatedtransitioning()
 at.ispresenting = false
 return at
 }
}

三、在模态跳转前修改控制器的 transitioningdelegate 代理为自定义的代理

注意：代理不能为局部变量

class viewcontroller: uiviewcontroller {
 // 必须保存为实例变量
 var ctdelegate = customtransitioningdelegate()
 override func touchesbegan(_ touches: set<uitouch>, with event: uievent?) {
 let vc = tempviewcontroller()
 vc.transitioningdelegate = ctdelegate
 self.present(vc, animated: true, completion: nil)
 }
}

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