数据拷贝问题

1，模型model 拷贝。遵循NSCopying 协议

实现- (id)copyWithZone:(NSZone*)zone  方法

事例：

@interface LLJAdultEdu_basicInfor_list_Model : NSObject <NSCopying>

@property(nonatomic,strong)NSString *event_info_one_desc;

@property(nonatomic,strong)NSString *name;

@property(nonatomic,strong)NSString *name_cn;

@end

@implementation LLJAdultEdu_basicInfor_list_Model

- (id)copyWithZone:(NSZone *)zone {

    LLJAdultEdu_basicInfor_list_Model *model = [[self class] allocWithZone:zone];

    model.event_info_one_desc = [_event_info_one_desc copy];

    model.name = [_name copy];

    model.name_cn = [_name_cn copy];

   return model;

   }

@end

2，数组包含数组，数组下的某一条数组的拷贝

//解析后台数据

   LLJAdultEdu_basicInforModel * inforModel = [LLJAdultEdu_basicInforModel mj_objectWithKeyValues:obj[@"data"][@"list"]];

self.inforModel = inforModel;          

@interface LLJAdultEdu_basicInforModel : NSObject

//配置model  jl_dataArray 是数据key

@property(nonatomic,strong)NSMutableArray *jl_dataArray;

@end

@implementation LLJAdultEdu_basicInforModel

+(NSDictionary *)mj_objectClassInArray{

        return @{@"jl_dataArray" : @"LLJAdultEdu_basicInfor_list_Model"};

}

- (NSMutableArray *)jl_dataArray{

       if (!_jl_dataArray) {

            _jl_dataArray = [[NSMutableArray alloc] init];

    }

       return _jl_dataArray;

}

@end

//单条数据模型 LLJAdultEdu_basicInfor_list_Model

@interface LLJAdultEdu_basicInfor_list_Model : NSObject 

@property(nonatomic,strong)NSString *event_info_one_desc;

@property(nonatomic,strong)NSString *name;

@property(nonatomic,strong)NSString *name_cn;

@end

@implementation LLJAdultEdu_basicInfor_list_Model

- (id)copyWithZone:(NSZone *)zone {

 LLJAdultEdu_basicInfor_list_Model *model = [[self class] allocWithZone:zone];

    model.event_info_one_desc = [_event_info_one_desc copy];

    model.name = [_name copy];

    model.name_cn = [_name_cn copy];

   return model;

   }

@end

目的：

self.inforModel.jl_dataArray 数组下包含一个数组，单个数组下是一条一条LLJAdultEdu_basicInfor_list_Model

现在想在self.inforModel.jl_dataArray 第0个位置拷贝一个数据，添加到self.inforModel.jl_dataArray里面

遇到问题 :

如果直接取出第0个数据，然后拷贝，是不行的。如果输入框的内容改变，数据会错乱。猜测是因为只拷贝了数组，而没有拷贝数组里面单条的model 

NSMutableArray * dataarray =self.inforModel.jl_dataArray[0];

 [self.inforModel.jl_dataArray addObject:dataarray.copy];

解决办法:

 NSMutableArray * dataarray = [[NSMutableArray alloc] init];

             //取出第0个数据

                        dataarray =self.inforModel.jl_dataArray[0];

                        //新创建一个可变数组

                        NSMutableArray * copy_data = [[NSMutableArray alloc] init];

                       //遍历第0个数据

                        for (LLJAdultEdu_basicInfor_list_Model * jianli_model in dataarray) {

                            //jianli_model 模型拷贝，添加到新数组当中

                            [copy_dataaddObject:jianli_model.copy];

                        }

                       

                     //新生成的数组添加到数据中

                           [self.inforModel.jl_dataArray addObject:copy_data];