AOP面向切面编程，降低业务耦合度
博客地址：iOS AOP实战
在Aspects的基础上添加了对类方法的支持，互相学习交流
To run the example project, clone the repo, and run pod install from the Example directory first.
MDAspects is available through CocoaPods. To install it, simply add the following line to your Podfile:
pod 'MDAspects'MDAspects is available under the MIT license. See the LICENSE file for more info.