自定义转场动画，弹出一个控制器在当前的控制器之上。
To run the example project, clone the repo, and run pod install from the Example directory first.
MYModalViewController is available through CocoaPods. To install it, simply add the following line to your Podfile:
pod 'MYModalViewController', '~> 1.0.0'
sunjinshuai, s_mike@163.com
MYModalViewController is available under the MIT license. See the LICENSE file for more info.