Question

我希望用户添加的项目数量如下：

-__+

如果用户添加他添加的项目+按钮并增加项目。所以我将textfield添加到表格并添加两个按钮加号（+）和减号（ - ）。这是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，它会将数据更改为所有添加的textField。如何防止这种情况？

Answer 1

你必须为它管理数组，

检查以下代码供您参考，希望它能帮到您

@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];
}

Answer 2

这种情况会发生，因为当您滚动表格视图时，会重复使用并重置所有文本字段

如果你想要实现这个功能，你应该在需要时使用scrollview和addSuview

表中的加号和减号

2 个答案: