ios5 支持 json 转化

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原创最新推荐文章于 2026-03-10 00:00:55 发布 581 阅读 AI 写同款· GEO 优化 ›

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解析json成dic对象

-(void)fetchedData:(NSData*)responseData {//parse out the json dataNSError* error;
    NSDictionary* json =[NSJSONSerialization
        JSONObjectWithData:responseData //1

        options:kNilOptions
        error:&error];

    NSArray* latestLoans =[json objectForKey:@"loans"]; //2

    NSLog(@"loans: %@", latestLoans); //3
}

把对象生成json string
//build an info object and convert to json
NSDictionary* info =[NSDictionary dictionaryWithObjectsAndKeys:[loan objectForKey:@"name"],
    @"who",
[(NSDictionary*)[loan objectForKey:@"location"]
    objectForKey:@"country"],
    @"where",
[NSNumber numberWithFloat: outstandingAmount],
    @"what",
nil];

//convert object to data
NSData* jsonData =[NSJSONSerialization dataWithJSONObject:info
options:NSJSONWritingPrettyPrinted error:&error];

//print out the data contents
jsonSummary.text =[[NSString alloc] initWithData:jsonData
encoding:NSUTF8StringEncoding];

添加json方法至dic
@interfaceNSDictionary(JSONCategories)
+(NSDictionary*)dictionaryWithContentsOfJSONURLString:(NSString*)urlAddress;
-(NSData*)toJSON;
@end

@implementationNSDictionary(JSONCategories)
+(NSDictionary*)dictionaryWithContentsOfJSONURLString:(NSString*)urlAddress{
    NSData* data =[NSData dataWithContentsOfURL:[NSURL URLWithString: urlAddress]];
    __autoreleasing NSError* error =nil;
    id result =[NSJSONSerialization JSONObjectWithData:data
      options:kNilOptions error:&error];
    if(error !=nil)returnnil;
    return result;
}

-(NSData*)toJSON{
    NSError* error =nil;
    id result =[NSJSONSerialization dataWithJSONObject:self
      options:kNilOptions error:&error];
    if(error !=nil)returnnil;
    return result;
}@end

使用列子
NSDictionary* myInfo =[NSDictionary dictionaryWithContentsOfJSONURLString:@"http://www.yahoo.com/news.json"];
NSDictionary* information =[NSDictionary dictionaryWithObjectsAndKeys:@"orange",@"apple",@"banana",@"fig",nil];
NSData* json =[information toJSON];

判断是否可json化

BOOL isTurnableToJSON =[NSJSONSerialization isValidJSONObject: object]