通过反射机制获取符合条件的属性变量

Mirror+.swift

extension Mirror {

    /**
     *  通过反射机制获取所有符合条件的属性
     *
     *  - parameter target: 查看哪个target中的属性
     *  - parameter type:
     *  - parameter recursivelay: 是否进行递归查询
     *  - parameter closure: 查看出的符合条件的属性的回调函数
     */
    static func reflectProperties<T>(of target: Any,
                                     matchingType type: T.Type = T.self,
                                     recursively: Bool = false,
                                     using closure: (T) -> Void) {
        let mirror = Mirror(reflecting: target)

        for child in mirror.children {
            (child.value as? T).map(closure)

            if recursively {
                // To enable recursive reflection, all we have to do is to call our own method again,
                // using the value of each child, and using the same closure.
                Mirror.reflectProperties(of: child.value,
                                         recursively: true,
                                         using: closure)
            }
        }
    }
}

// Demo

protocol Demotable {
    func run()
}

struct Demo {
    var name: String = "name0"
    var age: Int = 0
    var date: Date = Date()
    var vender: String = "vender0"

    var demoTable: Demotable!

    func reset() {
        Mirror.reflectProperties(of: self) { (child: String) in
            print("fetch all type is string properties: \(child)")
        }

        Mirror.reflectProperties(of: self) { (demoTable: Demotable) in
            print("fetch demotable properties")
            demoTable.run()
        }
    }
}
let demo = Demo()
demo.reset()