NSObject+JSONCategories.h

#import <Foundation/Foundation.h>

@interface NSObject (JSONCategories)

/**
 * 描述：將NSArray或者NSDictionary轉化為NSData
 * 引數：
 * 返回值：轉化後的NSData
 *
 */
-(NSData*)JSONData;

/**
 * 描述：將NSArray或者NSDictionary轉化為NSString
 * 引數：
 * 返回值：轉化後的NSString
 *
 */
-(NSString*)JSONString;

@end
 

#import "NSObject+JSONCategories.h"

@implementation NSObject (JSONCategories)

-(NSString*)JSONString;
{
    NSError* error = nil;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:self
                                                       options:NSJSONWritingPrettyPrinted
                                                         error:&error];
    
    if ([jsonData length] > 0 && error == nil){
        NSString *jsonString = [[NSString alloc] initWithData:jsonData
                                                      encoding:NSUTF8StringEncoding];
        return [jsonString autorelease];
    }else{
        return nil;
    }
}

-(NSData*)JSONData{
    NSError* error = nil;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:self
                                                       options:NSJSONWritingPrettyPrinted
                                                         error:&error];
    if ([jsonData length] > 0 && error == nil){
        return jsonData;
    }else{
        return nil;
    }
}