Json 和 Dictionary之間的轉換

NSDictionary + Json .h

#import <Foundation/Foundation.h>

@interface NSDictionary (Json)

//把網址上Json的數據，轉換成字典

+(NSDictionary*)dictionaryWithContentsOfURLString:(NSString*)urlAddress;

//把字典轉成Json對象

-(NSData*)toJSON;

@end

NSDictionary + Json .m

#import "NSDictionary+Json.h"

@implementation NSDictionary (Json)

// 直把远程的地址上Json数据转,换成Dictionary对象

+(NSDictionary*)dictionaryWithContentsOfURLString:(NSString*)urlAddress

{

    // 请求远程数据，存放到NSData对象中

    NSData* data =[NSDatadataWithContentsOfURL:[NSURLURLWithString: urlAddress]];

    

    // 定义一个错误信息的对象

    __autoreleasingNSError *error =nil;

    

    // 序列化字符串

    id result =[NSJSONSerialization JSONObjectWithData:data

                                               options:kNilOptions error:&error];

    if(error !=nil)

        return nil;

    

    return result;

}

// 把当前的Dictionary对象,转成Json对象

-(NSData*)toJSON{

    NSError *error =nil;

    // 把当前的Dictionary对象转换成字符串

    id result =[NSJSONSerializationdataWithJSONObject:self

                                               options:kNilOptions error:&error];

    if(error !=nil)

        return nil;

    

    return result;

}

@end