NSJSONSerialization

NSJSONSerialization.swift

//: Playground - noun: a place where people can play

import UIKit

// NSJSONSerialization(iOS5新增) 类似的第三方库有：SBJSON、TouchJSON、YAJL、JSONKit、NextiveJson。
// 可以将JSON数据转为Foundation对象，一般是 NSDictionary 或者 NSArray，或者将Foundation对象转换为JSON数据

// NSJSONReadingOptions
// MutableContainers：转换的来的 NSArray 或 NSDictionary 是 mutable 的
// MutableLeaves：转换来的对象中，叶子节点的 NSString 是 mutable 的
// AllowFragments：可以转换形如 "string" 这样的字符串为 string 字符串

// 对象转JSON
func obj2json(obj:AnyObject) -> String? {
//    if(!NSJSONSerialization.isValidJSONObject(obj)){
//        print("无法转换")
//    }
    do{
        let data : NSData! = try NSJSONSerialization.dataWithJSONObject(obj, options: NSJSONWritingOptions.PrettyPrinted)
        let str = NSString(data: data, encoding: NSUTF8StringEncoding) as String!
        return str
    }catch{
        print("无法转换")
        return nil
    }
}

// JSON转对象
func json2obj(str:String) -> AnyObject? {
    let data : NSData! = str.dataUsingEncoding(NSUTF8StringEncoding)
    do{
        let obj : AnyObject! = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.AllowFragments)
        return obj
    }catch{
//        print("无法转换")
        return nil
    }
}
func checkType(obj:AnyObject?) -> String {
    if(obj==nil){
        return "nil"
    }else if(obj is NSDictionary){
        return "NSDictionary"
    }else if(obj is NSArray){
        return "NSArray"
    }else if(obj is String){
        return "String"
    }else if(obj is Int){
        return "Int"
    }
    return "not include"
}

let user = [
    "name":"xxy",
    "tel":["mobile":"138", "home":"021"]
]
let str : String! = obj2json(user)
print(str)
print(checkType(str))

var json : AnyObject! = json2obj(str)
print("This is a "+checkType(json)+":")
print(json)

json = json2obj("[1,2,3,4]")
print("This is a "+checkType(json)+":")
print(json)

json = json2obj("{\"a\":\"a\"}")
print("This is a "+checkType(json)+":")
print(json)

json = json2obj("12345")
print("This is a "+checkType(json)+":")
print(json)



//
//// 检查类型
//var data = "[1,2,3]".dataUsingEncoding(NSUTF8StringEncoding)
//do{
//    var json = try NSJSONSerialization.JSONObjectWithData(data!, options: NSJSONReadingOptions.MutableContainers)
//    print(checkType(json))
//}catch{
//    
//}
//
//