JSONString

- (NSString *)jsonStringFromObject:(id)object { //OC对象转JSON
    NSError *erro = nil;
    NSData *jsondata = [NSJSONSerialization dataWithJSONObject:object options:NSJSONWritingPrettyPrinted error:&erro];
    NSString *jsonString = [[NSString alloc]initWithData:jsondata encoding:NSUTF8StringEncoding];
    return jsonString;
}


//把jsonString转换成任意对象
- (id)jsonStringToObject:(NSString *)jsonString
{
    NSData *data = [jsonString dataUsingEncoding:NSUTF8StringEncoding];
    NSError *error;
    id object = [NSJSONSerialization JSONObjectWithData:data
                 
                                                options:NSJSONReadingAllowFragments
                 
                                                  error:&error];
    if(error) {
        
        NSLog(@"json解析失败：%@",error);
        return nil;
    }
    return object;
}