将字典或者数组转换成JSON数据或者字符串

//
//  NSDictionary+JSON.h
//  Category
//
//  Created by YouXianMing on 15-2-09.
//  Copyright (c) 2014年 YouXianMing. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSDictionary (JSON)

/**
*  转换成JSON串字符串（没有可读性）
*
*  @return JSON字符串
*/
- (NSString *)toJSONString;

/**
*  转换成JSON串字符串（有可读性）
*
*  @return JSON字符串
*/
- (NSString *)toReadableJSONString;

/**
*  转换成JSON数据
*
*  @return JSON数据
*/
- (NSData *)toJSONData;

@end

//
//  NSDictionary+JSON.m
//  Category
//
//  Created by YouXianMing on 15-2-09.
//  Copyright (c) 2014年 YouXianMing. All rights reserved.
//

#import "NSDictionary+JSON.h"

@implementation NSDictionary (JSON)

- (NSString *)toJSONString {
NSData *data = [NSJSONSerialization dataWithJSONObject:self
options:NSJSONReadingMutableLeaves | NSJSONReadingAllowFragments
error:nil];

if (data == nil) {
return nil;
}

NSString *string = [[NSString alloc] initWithData:data
encoding:NSUTF8StringEncoding];
return string;
}

- (NSString *)toReadableJSONString {
NSData *data = [NSJSONSerialization dataWithJSONObject:self
options:NSJSONWritingPrettyPrinted
error:nil];

if (data == nil) {
return nil;
}

NSString *string = [[NSString alloc] initWithData:data
encoding:NSUTF8StringEncoding];
return string;
}

- (NSData *)toJSONData {
NSData *data = [NSJSONSerialization dataWithJSONObject:self
options:NSJSONWritingPrettyPrinted
error:nil];

return data;
}

@end

//
//  NSArray+JSON.h
//  Category
//
//  Created by YouXianMing on 15-2-09.
//  Copyright (c) 2014年 YouXianMing. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface NSArray (JSON)

/**
*  转换成JSON串字符串（没有可读性）
*
*  @return JSON字符串
*/
- (NSString *)toJSONString;

/**
*  转换成JSON串字符串（有可读性）
*
*  @return JSON字符串
*/
- (NSString *)toReadableJSONString;

/**
*  转换成JSON数据
*
*  @return JSON数据
*/
- (NSData *)toJSONData;

@end

//
//  NSArray+JSON.m
//  Category
//
//  Created by YouXianMing on 15-2-09.
//  Copyright (c) 2014年 YouXianMing. All rights reserved.
//

#import "NSArray+JSON.h"

@implementation NSArray (JSON)

- (NSString *)toJSONString {
NSData *data = [NSJSONSerialization dataWithJSONObject:self
options:NSJSONReadingMutableLeaves | NSJSONReadingAllowFragments
error:nil];

if (data == nil) {
return nil;
}

NSString *string = [[NSString alloc] initWithData:data
encoding:NSUTF8StringEncoding];
return string;
}

- (NSString *)toReadableJSONString {
NSData *data = [NSJSONSerialization dataWithJSONObject:self
options:NSJSONWritingPrettyPrinted
error:nil];

if (data == nil) {
return nil;
}

NSString *string = [[NSString alloc] initWithData:data
encoding:NSUTF8StringEncoding];
return string;
}

- (NSData *)toJSONData {
NSData *data = [NSJSONSerialization dataWithJSONObject:self
options:NSJSONWritingPrettyPrinted
error:nil];

return data;
}

@end