JSONExport 转换模型时候后，需要自定义更小模型时候可用Map

//用map 函数快速 转换模型  如 大模型 -> 小模型 或 小小大

struct BigModel {
    var name:String!
    var age:Int!
    var adress:String!
    var gender:String!
}

struct SmallModel {
    var name:String! = ""
    var age:Int! = 0
}

let bigDatas = [BigModel(name: "逗牛", age: 10, adress: "简书3515号", gender: "男"), BigModel(name: "锅盖", age: 12, adress: "某岛369号", gender: nil)]

//简写
let smallDatas = bigDatas.map { SmallModel(name: $0.name ,age: $0.age) }

//完整写法
let smallDatas2 = bigDatas.map { (bigData) -> SmallModel in
    return SmallModel(name: bigData.name, age: bigData.age)
}

print(smallDatas2)

注意：服务器返回的nil数据时候

// 有时候服务器返回的数据，有可能出现空值情况
//JSONExport秒转Model  使用时候注意nil 
//下面进行简单处理
let notNormalDatas = [BigModel(name: "逗牛", age: nil, adress: "冒险岛蜗牛", gender: "男"), BigModel(name: nil, age: 12, adress: "冒险岛", gender: nil)]
let notNormalData = notNormalDatas.map { (notNormalData) -> SmallModel in
    var smallM = SmallModel()
    if let name = notNormalData.name {
        smallM.name = name
    }
    if let age = notNormalData.age {
        smallM.age = age
    }
    return smallM
}

print(notNormalData)