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
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//需要设置转场动画的控制器titleviewvc.transitioningdelegate = aniamator//这里的animator是animator的实例
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下面是animator类中的代码
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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)
}
}
}
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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，谢谢大家对服务器之家的支持。
原文链接：http://www.jianshu.com/p/afb04b49be41
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