用来弹出view，包括了3种常见方式
To run the example project, clone the repo, and run pod install from the Example directory first.
SYShow is available through CocoaPods. To install it, simply add the following line to your Podfile:
pod 'SYShow'YangShi123, shiyawn@163.com
SYShow is available under the MIT license. See the LICENSE file for more info.