字典，数组JSON序列化

字典序列化Json

NSDictionary+BVJSONString.h

#import <Foundation/Foundation.h>

@interface NSDictionary (BVJSONString)

- (NSString*)bv_jsonStringWithPrettyPrint:(BOOL)prettyPrint;

@end

NSDictionary+BVJSONString.m

#import "NSDictionary+BVJSONString.h"

@implementation NSDictionary (BVJSONString)

- (NSString*)bv_jsonStringWithPrettyPrint:(BOOL)prettyPrint {
    NSError *error;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:self
                                                       options:(NSJSONWritingOptions) (prettyPrint ? NSJSONWritingPrettyPrinted : 0)
                                                         error:&error];
    
    if (! jsonData) {
        NSLog(@"bv_jsonStringWithPrettyPrint: error: %@", error.localizedDescription);
        return @"{}";
    } else {
        return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
    }
}

@end

数组序列化Json
NSArray+BVJSONString.h

#import <Foundation/Foundation.h>

@interface NSArray (BVJSONString)

- (NSString *)bv_jsonStringWithPrettyPrint:(BOOL)prettyPrint;

@end

NSArray+BVJSONString.m

#import "NSArray+BVJSONString.h"

@implementation NSArray (BVJSONString)

- (NSString*)bv_jsonStringWithPrettyPrint:(BOOL)prettyPrint {
    NSError *error;
    NSData *jsonData = [NSJSONSerialization dataWithJSONObject:self
                                                       options:(NSJSONWritingOptions) (prettyPrint ? NSJSONWritingPrettyPrinted : 0)
                                                         error:&error];
    
    if (! jsonData) {
        NSLog(@"bv_jsonStringWithPrettyPrint: error: %@", error.localizedDescription);
        return @"[]";
    } else {
        return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
    }
}

@end

prettyPrint是方便打印查看，如果需要�使用的话还是设为NO，不然可能会出现一些你不需要的问题。