SBJson库解析（二）NSObject+SBJson

一.NSObject+SBJson.h

1.把objc对象编码成json字符串

通过类别，为NSObject添加新方法：[NSObject JSONRepresentation]

@interface NSObject (NSObject_SBJsonWriting)
/**
虽然定义成NSObject的类别，但仅对NSArray和NSDictionary有效
返回：已编码的json对象，或nil
*/
- (NSString *)JSONRepresentation;
@end

2.把json对象解析为objc对象

通过类别，为NSString添加新方法：[NSString JSONValue]

@interface NSString (NSString_SBJsonParsing)
/**
返回：NSDictionary或NSArray对象，或nil
*/
- (id)JSONValue;
@end

二.NSObject+SBJson.m

导入头文件

#import "NSObject+SBJson.h"
#import "SBJsonWriter.h"
#import "SBJsonParser.h"

1.通过json编写器SBJsonWriter，的stringWithObject: 方法，实现[NSObject JSONRepresentation]编码逻辑

@implementation NSObject (NSObject_SBJsonWriting)

//objc2json
- (NSString *)JSONRepresentation {
SBJsonWriter *writer = [[SBJsonWriter alloc] init];
NSString *json = [writer stringWithObject:self];
if (!json)
NSLog(@"-JSONRepresentation failed. Error is: %@", writer.error);
return json;
}

@end

2.通过json解析器SBJsonParser，的objectWithString: 方法，实现[NSString JSONValue]解析逻辑

@implementation NSString (NSString_SBJsonParsing)

//json2objc
- (id)JSONValue {
SBJsonParser *parser = [[SBJsonParser alloc] init];
id repr = [parser objectWithString:self];
if (!repr)
NSLog(@"-JSONValue failed. Error is: %@", parser.error);
return repr;
}

@end