核心代码取自CombineCocoa, CombineExt，并对其bug进行修复。
CombineCocoa：https://github.com/CombineCommunity/CombineCocoa
CombineExt: https://github.com/CombineCommunity/CombineExt 此外还参考了CombineX的方法实现
To run the example project, clone the repo, and run pod install from the Example directory first.
CombineCocoaKit is available through CocoaPods. To install it, simply add the following line to your Podfile:
pod 'CombineCocoaKit'fmdb, dzb8818082@163.com
CombineCocoaKit is available under the MIT license. See the LICENSE file for more info.