iOS:JSON转OC属性小工具

在iOS开发中，只要有网络模块，就需要数据模型的编写。在进行数据模型的解析和映射时，JSONModel是一个非常常用且优秀的第三方框架，之前有有过博客对其分析，地址如下：

JSONModel源码分析：https://my.oschina.net/u/2340880/blog/1787561。

  无论使用什么第三方的JSON数据解析框架，我们都需要手动来编写数据模型类，这是一个十分机械性的体力活，本篇博客将介绍一个配合与JSONModel使用的自动生成属性脚本(支持类的嵌套)。

  本脚本采用的语言为JavaScript，采用JavaScript编写有两个好处，首先其可以在node环境运行，可以十分方便的操作文件，使用它可以直接将JSON文件转换成OC数据模型类。其次，它也十分容易在Web端运行，可以通过网页可视化的进行数据模型的转换。

  闲话少说，直接上源码：

var fileManager = require('fs');
var gettype=Object.prototype.toString;
String.prototype.firstUpperCase = function(){

return this.replace(/\b(\w)(\w*)/g, function($0, $1, $2) {
    return $1.toUpperCase() + $2.toLowerCase();
});

}
var arguments = process.argv.splice(2);
var path = arguments[0];
if (!path) {

console.log("请传入要转换的JSON文件路径");
return;

}
console.log('json文件路径:', path);
try{

var result = JSON.parse(fileManager.readFileSync(path));

}catch(error){

console.log("解析JSON文件失败:"+error);
return;

}
if (!result) {

console.log("解析JSON文件无效");
return;

}
var classArray = new Array();
parseObject("MyObject",result);

var stringAll="";
//输出
for (var i = classArray.length-1; i >=0 ; i--) {

let cla = classArray[i];
stringAll+="@protocol "+cla.name+" @end\r\n\r\n@interface "+cla.name+" : JSONModel\r\n\r\n";
console.log("@protocol "+cla.name+" @end\r\n\r\n@interface "+cla.name+" : JSONModel\r\n\r\n");
for (var j = 0; j < cla.property.length; j++) {
    stringAll+=cla.property[j]+"\r\n\r\n";
    console.log(cla.property[j]+"\r\n\r\n");
}
stringAll+="@end\r\n\r\n";
console.log("@end\r\n\r\n");

}
stringAll+="===========m文件======================\r\n";
console.log("===========m文件======================\r\n");
for (var i = classArray.length-1; i >=0 ; i--) {

let cla = classArray[i];
stringAll+="@implementation "+cla.name+"\r\n\r\n@end\r\n\r\n";
console.log("@implementation "+cla.name+"\r\n\r\n@end\r\n\r\n");

}
let paths = path.split("/");
paths.pop();
let newPath = paths.join("/")+"/oc.txt";
fileManager.writeFileSync(newPath,stringAll);
//核心解析函数
function parseObject(k,result){

let c = new Class(k);
classArray.push(c);
for (var i = 0; i < Object.getOwnPropertyNames(result).length; i++) {
    let key = Object.getOwnPropertyNames(result)[i];
    let value = result[key];
    let type = getType(value);
    if(type==null){
        continue;
    }
    if (type=="Object") {
        //进行二次解析
        if (Object.getOwnPropertyNames(value).length==0) {
            c.property.push("@property(nonatomic,strong)NSDictionary<Optional>*"+key+";");
        }else{
            parseObject(key.firstUpperCase(),value);
            c.property.push("@property(nonatomic,strong)"+key.firstUpperCase()+"<Optional,"+key.firstUpperCase()+">*"+key+";");
        }
        continue;
    }
    if (type=="Array") {
        if (value.length>0) {
            let obj = value[0];
            let t = getType(obj);
            if (t==null) {
                continue;
            }
            if (t=="Object") {
                c.property.push("@property(nonatomic,strong)NSArray<"+key.firstUpperCase()+"*><Optional,"+key.firstUpperCase()+">*"+key+";");
                parseObject(key.firstUpperCase(),obj);
            }else{
                c.property.push("@property(nonatomic,strong)NSArray<"+t+"*><Optional>*"+key+";");
            }
        }else{
            c.property.push("@property(nonatomic,strong)NSArray<Optional>*"+key+";");
        }
        continue;
    }
    if (type=="id") {
        c.property.push("@property(nonatomic,strong)"+type+"<Optional>"+key+";");
        continue;
    }
    c.property.push("@property(nonatomic,strong)"+type+"<Optional>*"+key+";");
}

}
//获取要转换的类型
function getType(obj){

if (typeof obj == 'number') {
    return "NSNumber";
}
if (typeof obj == 'undefined') {
    return "id";
}
if (typeof obj == 'null') {
    return "id";
}
if (typeof obj == 'function') {
    return null;
}
if (typeof obj == 'string') {
    return "NSString"
}
if (typeof obj == 'boolean') {
    return "NSNumber"
}
if (typeof obj == 'object') {
    if (gettype.call(obj)=="[object Object]") {
        return "Object";
    }
    if (gettype.call(obj)=="[object Array]") {
        return "Array";
    } 
    if (gettype.call(obj)=="[object Null]"){
        return "id";
    }
}

}
//类
function Class(name){

this.name = name;
this.property = new Array();

}
在终端使用如下指令直接运行此脚本：

node Tool.js /Users/jaki/Desktop/json.json
命令后面所跟的参数为JSON文件的路径，JSON文件内容如下：

{
"code": 0,
"message": "",
"result": {

"aid": "be3bdab8-fbf5-4e89-97cb-56b00048b09b",
"audios": [],
"avatar_url": "https://www.google.com/a.jpg",
"call_price": 0,
"cid": "efad6549-be62-40d7-a425-40f9b7730192",
"cover_url": "https://www.google.com/a.jpg",
"created_on": "1528349104",
"fields": [
  {
    "key": "name",
    "value": "Mr.Wang"
  },
  {
    "key": "company",
    "value": "TicTalk"
  },
  {
    "key": "position",
    "value": "Senior Engineer"
  }
],
"geo": {
  "description": "Shanghai, China",
  "latitude": 48.82694828196076,
  "longitude": 2.367038433387592
},
"id": 2,
"message_price": 0,
"photo_sets": [],
"pid": "9b64395f-687c-4f34-9a5d-68d9adafa4cc",
"rid": "578ff973-c707-42b2-bfc2-87e4dc8e0efd",
"role_open": false,
"sid": "8f560338-dfa5-48be-b44c-65fd87798543",
"status": 0,
"updated_on": "1528349104",
"video_price": 0,
"videos": [],
"world_open": true

}
}
运行后，可以看到在JSON文件同一目录下生成了oc.txt文件，内容如下：

@protocol Geo @end

@interface Geo : JSONModel

@property(nonatomic,strong)NSString*description;

@property(nonatomic,strong)NSNumber*latitude;

@property(nonatomic,strong)NSNumber*longitude;

@end

@protocol Fields @end

@interface Fields : JSONModel

@property(nonatomic,strong)NSString*key;

@property(nonatomic,strong)NSString*value;

@end

@protocol Result @end

@interface Result : JSONModel

@property(nonatomic,strong)NSString*aid;

@property(nonatomic,strong)NSArray*audios;

@property(nonatomic,strong)NSString*avatar_url;

@property(nonatomic,strong)NSNumber*call_price;

@property(nonatomic,strong)NSString*cid;

@property(nonatomic,strong)NSString*cover_url;

@property(nonatomic,strong)NSString*created_on;

@property(nonatomic,strong)NSArray<Fields><Optional,Fields>fields;

@property(nonatomic,strong)Geo<Optional,Geo>*geo;

@property(nonatomic,strong)NSNumber*id;

@property(nonatomic,strong)NSNumber*message_price;

@property(nonatomic,strong)NSArray*photo_sets;

@property(nonatomic,strong)NSString*pid;

@property(nonatomic,strong)NSString*rid;

@property(nonatomic,strong)NSNumber*role_open;

@property(nonatomic,strong)NSString*sid;

@property(nonatomic,strong)NSNumber*status;

@property(nonatomic,strong)NSString*updated_on;

@property(nonatomic,strong)NSNumber*video_price;

@property(nonatomic,strong)NSArray*videos;

@property(nonatomic,strong)NSNumber*world_open;

@end

@protocol MyObject @end

@interface MyObject : JSONModel

@property(nonatomic,strong)NSNumber*code;

@property(nonatomic,strong)NSString*message;

@property(nonatomic,strong)Result<Optional,Result>*result;

@end

===========m文件======================
@implementation Geo

@end

@implementation Fields

@end

@implementation Result

@end

@implementation MyObject

@end

后面我们只需要将类名调整成所需要的即可。

  下面是一个即用的网页转换器，采用的脚本代码和上面的代码基本一致：

http://zyhshao.github.io/JSONToOC.html

使用效果如下：