A skin-changing (theme) framework for iOS/macOS that supports dynamic skin changing and custom attributes, and also supports non-invasive skin changing (swizzling).
License: MIT License
仔细看了作者写的文章，写得很好，不知道对于同一主题下面同一个抽象控件（比如UIButton）有多个背景颜色，及在不同背景颜色下面有不同的字体大小和字体颜色，该如何设计，才能让使用者做到见名知义了？
思考：
想过参考UIButton的构造方法中枚举一样（UIButtonTypeCustom和UIButtonTypeSystem等）在Button这个json文件下面设置对应的key和value，但是如果在同一个主题下面button超过3种以上的不同背景颜色，使用者可能需要通过看注释说明，如果在添加一个新的主题，json文件中的颜色值对应关系也不好确定。
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