ios - 表中的加号和减号

Question

我想要用户添加的项目数量，例如:

-__+

如果用户添加项目，他添加 + 按钮并增加项目。所以我加了 textfield表并添加两个按钮加(+)和减(-)。这是我在 cellForRowAtIndexPath 中的代码:

 if(isPlus){
        countFruitQty++;
        cell.txtQty.text = [NSString stringWithFormat:@"%i",countFruitQty];
    }
    else{
        countFruitQty--;
        if(countFruitQty > 0)
            cell.txtQty.text = [NSString stringWithFormat:@"%i",countFruitQty];
        else{
            cell.txtQty.text = @"";
            countFruitQty = 0;
        }

但是在滚动时，它将数据更改为所有添加的文本字段。
如何防止这种情况？

Answer 1

你必须为它管理数组，

检查下面的代码供您引用，希望对您有所帮助

@interface YourViewController ()
{
    NSMutableArray *arrMain;      // Your main array (Table row count)
    NSMutableArray *arrCounter;   // Counter array
    int a;
}

- (void)viewDidLoad {

       arrMain = [[NSMutableArray alloc] init];
       arrCounter = [[NSMutableArray alloc] init];
       a = 0;
       for (int i = 0, i < [arrMain count], i++) {

           [arrCounter addObject:[NSString stringWithFormat:@"%d",a]];
       }
}


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

      cell.btnPlus.tag = indexPath.row;
        [cell.btnPlus addTarget:self action:@selector(click_Plus:) forControlEvents:UIControlEventTouchUpInside];

        cell.btnMinus.tag = indexPath.row;
        [cell.btnMinus addTarget:self action:@selector(click_Minus:) forControlEvents:UIControlEventTouchUpInside];

        cell.txtQty.text = [arrCounter objectAtIndex:indexPath.row];
}


-(IBAction)click_Plus:(UIButton *)sender {

    int qnt = [cell.txtQty.text intValue];
    cell. txtQty.text = [NSString stringWithFormat:@"%d",++qnt];
    [arrCounter replaceObjectAtIndex:sender.tag withObject:cell.txtQty.text];
}

-(IBAction)click_Minus:(UIButton *)sender {

    int qnt = [cell.txtQty.text intValue];
    cell.txtQty.text = [NSString stringWithFormat:@"%d",--qnt];
    [arrCounter replaceObjectAtIndex:sender.tag withObject:cell.txtQty.text];
}