iOS 對象數組生成jsonarray

//1. 初始化可變字符串，存放最終生成json字串  
        NSMutableString *jsonString = [[NSMutableString alloc] initWithString:@"{\"actorhalls\":["];  
          
        for(ExecplanActosHall *hall in actorhalls){  
              
            //2. 遍歷數組，取出鍵值對並按json格式存放  
            NSString *string;  
              
            string  = [NSString stringWithFormat:  
                      @"{\"ownerName\":\"%@\",\"ownerId\":\"%@\",\"channelId\":\"%@\",\"ownerType\":\"%ld\"},",hall.ownerName,hall.ownerId,hall.channelId,(long)hall.ownerType];  
              
            [jsonString appendString:string];  
              
        }  
        // 3. 獲取末尾逗號所在位置  
        NSUInteger location = [jsonString length]-1;  
       
        NSRange range       = NSMakeRange(location, 1);  
          
        // 4. 將末尾逗號換成結束的]}  
        [jsonString replaceCharactersInRange:range withString:@"]}"];  
  
        NSLog(@"jsonString = %@",jsonString);  

 其一：字典轉json

//字典轉Json  
- (NSString*)dictionaryToJson:(NSDictionary *)dic  
{  
    NSError *parseError = nil;  
    NSData  *jsonData = [NSJSONSerialization dataWithJSONObject:dic options:NSJSONWritingPrettyPrinted error:&parseError];  
    return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];  
}  

 

其二：json轉字典

/*!  
 * @brief 把格式化的JSON格式的字符串轉換成字典  
 * @param jsonString JSON格式的字符串  
 * @return 返回字典  
 */  
+ (NSDictionary *)dictionaryWithJsonString:(NSString *)jsonString {  
    if (jsonString == nil) {  
        return nil;  
    }  
      
    NSData *jsonData = [jsonString dataUsingEncoding:NSUTF8StringEncoding];  
    NSError *err;  
    NSDictionary *dic = [NSJSONSerialization JSONObjectWithData:jsonData  
                                                        options:NSJSONReadingMutableContainers  
                                                          error:&err];  
    if(err) {  
        NSLog(@"json解析失敗：%@",err);  
        return nil;  
    }  
    return dic;  
}