iOS swift实现转场动画的方法示例

转场动画介绍

转场动画在我们日常开发中是经常遇到的，所谓转场动画，就是一个控制器的view切到另一个控制器的view上过程中过的动画效果。本例子是实现了在导航控制器的titleview边上慢慢弹出一个控制器。下面话不多说，来一起看看详细的介绍：

效果图：

专场前

专场后

示例代码

首先自定义一个animator类。在需要转场的控制器内，设置代理

 //需要设置转场动画的控制器titleviewvc.transitioningdelegate = aniamator//这里的animator是animator的实例

下面是animator类中的代码

class animatortool: nsobject {
 lazy var ispresent = false
 var callback : ((ispresented:bool)->())?//向外界传递动画是否正在显示

 init(callback : ((ispresented:bool)->())) {
  self.callback = callback
 }//自定义构造方法，便于给闭包赋值
}
extension animatortool:uiviewcontrollertransitioningdelegate{
 func presentationcontrollerforpresentedviewcontroller(presented: uiviewcontroller, presentingviewcontroller presenting: uiviewcontroller, sourceviewcontroller source: uiviewcontroller) -> uipresentationcontroller? {
  return awypresentationcontroller(presentedviewcontroller: presented, presentingviewcontroller: presenting)//awypresentationcontroller是自定义继承自uipresentationcontroller的类，是为了设置modal出来的vc的view的大小
 }
 func animationcontrollerforpresentedcontroller(presented: uiviewcontroller, presentingcontroller presenting: uiviewcontroller, sourcecontroller source: uiviewcontroller) -> uiviewcontrolleranimatedtransitioning? {
  ispresent = true
  self.callback!(ispresented: ispresent)
  return self
 }

 func animationcontrollerfordismissedcontroller(dismissed: uiviewcontroller) -> uiviewcontrolleranimatedtransitioning? {
  ispresent = false
  self.callback!(ispresented: ispresent)
  return self
 }
}

extension animatortool:uiviewcontrolleranimatedtransitioning{
 func transitionduration(transitioncontext: uiviewcontrollercontexttransitioning?) -> nstimeinterval {
  return 0.5//动画时长
 }
 func animatetransition(transitioncontext: uiviewcontrollercontexttransitioning) {
  ispresent ?animatetransitionforpresented(transitioncontext) : animatetransitionfordismissed(transitioncontext)
 }

 func animatetransitionforpresented(transitoncontext:uiviewcontrollercontexttransitioning){
  let aimview = transitoncontext.viewforkey(uitransitioncontexttoviewkey)!
  transitoncontext.containerview()?.addsubview(aimview)

  aimview.transform = cgaffinetransformmakescale(1.0, 0.0)
  uiview.animatewithduration(transitionduration(transitoncontext), animations: {
   aimview.layer.anchorpoint = cgpointmake(0.5, 0.0)
   aimview.transform = cgaffinetransformidentity
  }) { (_) in
   transitoncontext.completetransition(true)
  }
 }

 func animatetransitionfordismissed(transitoncontext:uiviewcontrollercontexttransitioning){
  let aimview = transitoncontext.viewforkey(uitransitioncontextfromviewkey)!
  transitoncontext.containerview()?.addsubview(aimview)


  uiview.animatewithduration(transitionduration(transitoncontext), animations: {
   aimview.layer.anchorpoint = cgpointmake(0.5, 0.0)
   aimview.transform = cgaffinetransformmakescale(1.0, 0.001)//留一点值，这样会有动画效果
  }) { (_) in
   transitoncontext.completetransition(true)
  }

 }


}

总结

以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作能带来一定的帮助，如果有疑问大家可以留言交流，谢谢大家对的支持。