JSONModelWithMirror

使用Mirror创建基类，详细文档：使用Mirror实现自定义对象转JSON及对象序列化

只需要继承基类即可实现对象转JSON的方法，实现对象可打印，实现NSCoding协议，支持序列化。

注意要实现对象序列化，类中基础类型不要用可选类型，否则会crash，如Int？，也不能有自定义的结构等。

注：根据喵神的观点，不建议使用Mirror来做很多事情，读者可自行选择。

需求

实现一个基类Model，继承它的类不需要再写代码即可实现对象转json及对象序列化。

实现效果如下

基类为JSONModel，为了测试其健壮性，下面的例子写了一些嵌套关系

创建一些类，继承JSONModel：

 //用户类
 class User : JSONModel {
     var name:String = ""  //姓名
     var nickname:String?  //昵称
     var age:Int = 0   //年龄
     var emails:[String]?  //邮件地址
 }

 class Student: User {
     var accountID : Int = 0 //学号
 }

 class SchoolStudent: Student {
     var schoolName : String? //学校名
     var schoolmates : [Student]? //校友
     var principal : User? //校长
 }

初始化：

    //创建一个schoolstudent实例对象
    let schoolstudent = SchoolStudent()
    schoolstudent.schoolName = "清华大学"
    schoolstudent.accountID = 1024
    schoolstudent.name = "martin"
    schoolstudent.age = 20
    
    let principal = User()
    principal.name = "校长"
    principal.age = 60
    principal.emails = ["zhang@hangge.com","xiao@hangge.com"]
    schoolstudent.principal = principal
    
    let student1 = Student()
    student1.accountID = 2009
    student1.name = "martin"
    student1.age = 25
    student1.emails = ["martin1@hangge.com","martin2@hangge.com"]
    
    let student2 = Student()
    student2.accountID = 2008
    student2.name = "james"
    student2.age = 26
    student2.emails = ["james1@hangge.com","james2@hangge.com"]
    
    schoolstudent.schoolmates = [student1, student2]

测试打印JSON：这里实现了对象可打印，打印出来的即为对象转化后的JSON字符串，也可以调用 toJSONString() 方法

 //输出json字符串
    print("school student = \(schoolstudent)")

输出结果：

 school student = {
 "name" : "martin",
 "age" : 20,
 "accountID" : 1024,
 "schoolName" : "清华大学",
 "schoolmates" : [
   {
     "name" : "martin",
     "age" : 25,
     "accountID" : 2009,
     "emails" : [
       "martin1@hangge.com",
       "martin2@hangge.com"
     ]
   },
   {
     "name" : "james",
     "age" : 26,
     "accountID" : 2008,
     "emails" : [
       "james1@hangge.com",
       "james2@hangge.com"
     ]
   }
 ],
 "principal" : {
   "name" : "校长",
   "age" : 60,
   "emails" : [
     "zhang@hangge.com",
     "xiao@hangge.com"
   ]
 }

}

测试对象序列化：

    let a = NSKeyedArchiver.archivedData(withRootObject: schoolstudent)
    let b = NSKeyedUnarchiver.unarchiveObject(with: a)
    print("unarchiveObject = \(b)")

输出结果：

 unarchiveObject = Optional({
 "name" : "martin",
 "age" : 20,
 "accountID" : 1024,
 "schoolName" : "清华大学",
 "schoolmates" : [
   {
     "name" : "martin",
     "age" : 25,
     "accountID" : 2009,
     "emails" : [
       "martin1@hangge.com",
       "martin2@hangge.com"
     ]
   },
   {
     "name" : "james",
     "age" : 26,
     "accountID" : 2008,
     "emails" : [
       "james1@hangge.com",
       "james2@hangge.com"
     ]
   }
 ],
 "principal" : {
   "name" : "校长",
   "age" : 60,
   "emails" : [
     "zhang@hangge.com",
     "xiao@hangge.com"
   ]
 }
 })

Installation

CocoaPods

 pod 'JSONModelWithMirror', '~> 0.0.3'

Release note

0.0.4

主要适配swift 4，最主要的就是在基类前添加 @objcMembers 关键字.

在swift3中，如果你用 Swift 写的 class 是继承自 NSObject 的话，Swift 会默认自动为所有的非 private 的类和成员加上 @objc，但在swift4中这个特性没有了，我们只能手动在类前面加上@objcMembers(swift 3.2才加入的关键字)，或者在想要具有动态特性的属性或方法前加上@objc，这可能是苹果为了继续分离swift和oc所做的修改，也就是说继承自NSObject的类也不具备动态特性，想要使用必须声明。

License

martinLilili/JSONModelWithMirror

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