iphone - 重新加载表格 View 后，表格 View 中标签中的先前文本正在显示

Question

我有一个全局声明的数组并在表格 View 中加载该数组但是当我转到其他 Controller 并更新该数组并再次重新加载表格 View 时，表格 View 单元格中标签中的文本将被覆盖。较新的更新数据是最重要的，以前的数据也显示在同一标签中。这是我的代码:其中项目数组是全局声明的数组。

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

static NSString *CellIdentifier = @"Cell";


UITableViewCell *cell = [self.tableview dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) 
{
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault 
 reuseIdentifier:CellIdentifier] autorelease];    
  }

UILabel *nameLabel = [[UILabel alloc]initWithFrame:CGRectMake(45, 8, 100, 25)];
nameLabel.backgroundColor = [UIColor clearColor];
nameLabel.font = [UIFont fontWithName:@"Arial" size:16];
nameLabel.text = [[itemsArray objectAtIndex:indexPath.row] objectForKey:@"itemname"];
[cell addSubview:nameLabel];
[nameLabel release];

UIButton *deleteButton = [UIButton buttonWithType:UIButtonTypeCustom];
deleteButton.frame= CGRectMake(3, 3, 30, 30);
[deleteButton setImage: [UIImage imageNamed:@"cross_btn.png"] forState:UIControlStateNormal];
[cell addSubview:deleteButton];


UILabel *priceMark = [[UILabel alloc]initWithFrame:CGRectMake(150, 8, 65, 25)];
priceMark.backgroundColor = [UIColor clearColor];
priceMark.font = [UIFont fontWithName:@"Arial" size:14];
priceMark.text = [NSString stringWithFormat:@"Rs: %@",[[itemsArray objectAtIndex:indexPath.row] 
objectForKey:@"amount"]];
[cell addSubview:priceMark];     
[priceMark release];

UILabel *qtyLabel = [[UILabel alloc]initWithFrame:CGRectMake(225, 8, 60, 25)];
qtyLabel.backgroundColor = [UIColor clearColor];
qtyLabel.font = [UIFont fontWithName:@"Arial" size:14];
qtyLabel.text = [[itemsArray objectAtIndex:indexPath.row] objectForKey:@"qty"];
[cell addSubview:qtyLabel];
[qtyLabel release];

return cell;
} 

编辑 2

现在，当我更新在 0 索引处全局声明的项目数组并返回时，我遇到了其他问题，然后它不会更新索引 0 处的 TableView 行中的行，但是当我更新其他行时，它会更新。而且当我向上滚动表格 View 时，它会在所有索引的索引 0 处显示值。这是我的代码

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

static NSString *CellIdentifier = @"Cell";

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) 
{
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault 
   reuseIdentifier:CellIdentifier] autorelease];    
    nameLabel = [[UILabel alloc]initWithFrame:CGRectMake(45, 8, 100, 25)];
    nameLabel.backgroundColor = [UIColor clearColor];
    nameLabel.font = [UIFont fontWithName:@"Arial" size:16];
    [cell addSubview:nameLabel];

    deleteButton = [UIButton buttonWithType:UIButtonTypeCustom];
    deleteButton.frame= CGRectMake(3, 3, 30, 30);
    [deleteButton setImage: [UIImage imageNamed:@"cross_btn.png"] forState:UIControlStateNormal];
    [cell addSubview:deleteButton];

    priceMark = [[UILabel alloc]initWithFrame:CGRectMake(200, 8, 60, 25)]; //150, 8, 65, 25
    priceMark.backgroundColor = [UIColor clearColor];
    priceMark.font = [UIFont fontWithName:@"Arial" size:14];
    [cell addSubview:priceMark]; 

    qtyLabel = [[UILabel alloc]initWithFrame:CGRectMake(160, 8, 65, 25)]; //225, 8, 60, 25
    qtyLabel.backgroundColor = [UIColor clearColor];
    qtyLabel.font = [UIFont fontWithName:@"Arial" size:14];
    [cell addSubview:qtyLabel];
}


 nameLabel.text = [[itemsArray objectAtIndex:indexPath.row] objectForKey:@"itemname"];
  priceMark.text = [NSString stringWithFormat:@"Rs: %@",[[itemsArray 
  objectAtIndex:indexPath.row] objectForKey:@"amount"]];
   qtyLabel.text = [[itemsArray objectAtIndex:indexPath.row] objectForKey:@"qty"];

return cell;
    }

Answer 1

您不应该每次都创建新的 UILabels 和 UIButtons 并将它们添加为 subview 。
您的问题是您每次都添加新的。
您应该使用标签和按钮制作一个自定义 UITableViewCell 并设置它们。