如何在tableview的可变数组中存储多个选定的行项

Posted 2023-03-04

【中文标题】如何在tableview的可变数组中存储多个选定的行项

【英文标题】：How to store multiple selected row items in mutable array in tableview

【发布时间】：2017-05-11 06:25:29

【问题描述】：

我已经编写了用于显示具有 3 个部分的 tableview 的代码，现在我想将选定的行项存储到一个数组中，当我尝试下面的代码时，我得到的数组值为 nil。建议我如何解决这个问题 下面我添加代码和 Json 示例数据

  "technicians": 
    "group": [
      
        "first_name": "First",
        "last_name": "Available",
        "id": ""
      ,
      
        "first_name": "idea",
        "last_name": "Chandra",
        "id": 2885
      ,
      
        "first_name": "manson",
        "last_name": "Tolios",
        "id": 2878
      ,
      
        "first_name": "tata",
        "last_name": "Masson",
        "id": 2869
      
    ],
    "client": [
      
        "first_name": "tsms",
        "last_name": "ysys",
        "id": 2875
      ,
      
        "first_name": "Oscar",
        "last_name": "tata",
        "id": 2851
      ,
      
        "first_name": "Peter",
        "last_name": "yaha",
        "id": 2873
      ,
      
        "first_name": "iaka",
        "last_name": "adad",
        "id": 2847
      ,
      
        "first_name": "taga",
        "last_name": "uaja",
        "id": 2917
      
    ],
    "contractors": [
      
        "first_name": "taha"
      ,
      
        "first_name": "haka"
      ,
      
        "first_name": "oala"
      
    ]
  

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath

    UITableViewCell *cell=[tableView dequeueReusableCellWithIdentifier:@"EcsStafflist"];
        if(!cell)
        
            cell=[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"CellIdentifier"];
    
        
        UILabel *Fname = (UILabel *)[cell viewWithTag:18];
    
        UILabel *Lname = (UILabel *)[cell viewWithTag:19];
    
        Fname.text = [[[mydic objectForKey:[MysectionTitles objectAtIndex:indexPath.section]]objectAtIndex:indexPath.row]valueForKey:@"first_name"];
    
        Lname.text = [[[mydic objectForKey:[MysectionTitles objectAtIndex:indexPath.section]]objectAtIndex:indexPath.row]valueForKey:@"last_name"];
    
        if (indexPath.row %2 ==1)
    
            cell.backgroundColor = [UIColor colorWithRed:0.60 green:0.60 blue:0.95 alpha:1.0];
    
        else
    
            cell.backgroundColor = [UIColor colorWithRed:0.64 green:0.89 blue:0.61 alpha:1.0];

        return cell;



- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

  stringId = [[[mydic objectForKey:[MysectionTitles objectAtIndex:indexPath.section]]objectAtIndex:indexPath.row]objectForKey:@"id"];

    if
        ([tableView cellForRowAtIndexPath:indexPath].accessoryType == UITableViewCellAccessoryCheckmark)
    
        [tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryNone;
        
    else
        [tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryCheckmark;

        [myArray addObject:stringId];

        NSLog(@"myArray %@",myArray);
        
    

【问题讨论】：

你初始化 myArray 了吗？

是的，我已经初始化了@hamentmiglani

你在哪里得到零？如果您在初始化数组时遇到问题，那么这与 tableview 函数无关。您是否确认您的数组已正确填充？

在 ns 日志中我得到我的数组是空的，是的，我的数组被正确填充了@Russell

不能为 nil 且正确填充！

【参考方案1】：

首先在.m中为数组创建一个outlet并合成

现在在 viewdidLoad 中初始化数组

现在实现 cellforrowatIndexpath 和 didSelectRowAtIndexPath

找到代码，如果您需要澄清，请告诉我

String_Name = [ArrayName objectAtIndex:indexPath.row];

    if
        ([tableView cellForRowAtIndexPath:indexPath].accessoryType == UITableViewCellAccessoryCheckmark)
    
        [tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryNone;
        
    else
        [tableView cellForRowAtIndexPath:indexPath].accessoryType = UITableViewCellAccessoryCheckmark;

        [myArray addObject:String_Name];

        NSLog(@"myArray %@",myArray);
        
    

【参考方案2】：

试试这个代码

在创建新的NSMubaleArray *storeArray; NSMutableArray 之前，在viewDidLoad 中分配storeArray = [[NSMutableArray alloc]init];

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath

    switch (indexPath.section) 
        case 0:
            if ([storeArray containsObject:[mainArray objectAtIndex:indexPath.row]])
            
                [storeArray removeObject:[mainArray objectAtIndex:indexPath.row]];
            else
            [storeArray addObject: [mainArray objectAtIndex:indexPath.row]];
            
            break;
        case 2:
            if ([storeArray containsObject:[mainArray objectAtIndex:indexPath.row]])
            
                [storeArray removeObject:[mainArray objectAtIndex:indexPath.row]];
            else
                [storeArray addObject: [mainArray objectAtIndex:indexPath.row]];
            
            break;
        case 3 :
            if ([storeArray containsObject:[mainArray objectAtIndex:indexPath.row]])
            
                [storeArray removeObject:[mainArray objectAtIndex:indexPath.row]];
            else
                [storeArray addObject: [mainArray objectAtIndex:indexPath.row]];
            
            break;
        default:
            break;
    

    NSLog(@"%@",storeArray);