基于 NSJSONSerialization 和运行时为 ios 解析和格式化 JSON
pod 'GreedJSON'
#import "GreedJSON.h"// NSArray to NSString
- (NSString*)gr_JSONString;
// NSArray to NSData
- (NSData*)gr_JSONData;// NSData to NSDictionary or NSArray
- (__kindof NSObject*)gr_object// NSDictionary to NSString
- (NSString*)gr_JSONString;
// NSDictionary to NSData
- (NSData*)gr_JSONData;// NSString to NSDictionary or NSArray
- (__kindof NSObject*)gr_object// model to NSDictionary
- (__kindof NSObject *)gr_dictionary;
// NSDictionary to model
+ (id)gr_objectFromDictionary:(NSDictionary*)dictionary