MirrorObject:自动镜像动态属性

镜像对象 自动镜像动态属性。 用法 更新动态属性，然后它将反映到具有相同标识符的其他对象。 let a = User ( " u1 " , followers : 0 ) let b = User ( " u1 " , followers : 0 ) print (a. followers ) // -> 0 print (b. followers ) // -> 0 a. followers += 1 print (a. followers ) // -> 1 print (b. followers ) // -> 1 用户类别定义如下。 import MirrorObject class User : NSObject , MirrorObject { var id: String dynamic var followers: Int init ( id