当滚动表格视图单元格的视图，单元格文本更改

Question

我有一个UITableView和我编程地向单元格添加两个按钮。 1按钮添加到单元格文本（向上计数）另一个减去1（倒计数）。但是，可以说我添加4，单元格的文本将为4，但是当我将该单元格向上滚动并从视图中移出时，当它回到视图中时，单元格文本将返回到1，这是它开始的位置。同样的情况发生，如果我添加（它也是相同的，如果我减去）单元格文本和切换页面，然后返回到表视图。这里是cellForRow：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath 
{ 
    static NSString *CellIdentifier = @"Cell"; 

    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
    if (cell == nil) 
    { 
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; 
     newBtn = [[UIButton alloc]init]; 
     newBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect]; 
     [newBtn setFrame:CGRectMake(260,20,55,35)]; 
     [newBtn addTarget:self action:@selector(subtractLabelText:) forControlEvents:UIControlEventTouchUpInside]; 
     [newBtn setTitle:@"-" forState:UIControlStateNormal]; 
     [newBtn setEnabled:YES]; 
     [cell addSubview:newBtn]; 

     subBtn = [[UIButton alloc]init]; 
     subBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect]; 
     [subBtn setFrame:CGRectMake(200,20,55,35)]; 
     [subBtn addTarget:self action:@selector(addLabelText:) forControlEvents:UIControlEventTouchUpInside]; 
     [subBtn setTitle:@"+" forState:UIControlStateNormal]; 
     [subBtn setEnabled:YES]; 
     [cell addSubview:subBtn]; 
    } 
    [cell setSelectionStyle:UITableViewCellSelectionStyleNone]; 
    cell.imageView.image = [imageArray objectAtIndex:indexPath.row];  
    cell.textLabel.text = [cells objectAtIndex:indexPath.row]; 

return cell; 
} 

任何和所有帮助表示赞赏！谢谢：d

方法按钮

- (IBAction)addLabelText:(id)sender{  
    cell = (UITableViewCell*)[sender superview];  
    cell.textLabel.text = [NSString stringWithFormat:@"%d",[cell.textLabel.text intValue] +1]; 
} 

- (IBAction)subtractLabelText:(id)sender 
{ 
    cell = (UITableViewCell*)[sender superview];   
    if ([[cell.textLabel text] intValue] == 0){ 
     cell.textLabel.text = [NSString stringWithFormat:@"%d",[cell.textLabel.text intValue] +0]; 
    } 
    else{ 
     cell.textLabel.text = [NSString stringWithFormat:@"%d",[cell.textLabel.text intValue] -1]; 
     //[myTableView reloadData]; 

    } 
} 

Answer 1

你需要这样的事情，你在哪里储存在细胞外的值。这是因为细胞被重复使用，并且不能长期保存。

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath 
{ 
    static NSString *CellIdentifier = @"Cell"; 

    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
    if (cell == nil) 
    { 

     subBtn = [[UIButton alloc]init]; 
     subBtn=[UIButton buttonWithType:UIButtonTypeRoundedRect]; 
     [subBtn setFrame:CGRectMake(200,20,55,35)]; 
     [subBtn addTarget:self action:@selector(addLabelText:indexPath.row) forControlEvents:UIControlEventTouchUpInside]; 
     [subBtn setTitle:@"+" forState:UIControlStateNormal]; 
     [subBtn setEnabled:YES]; 
     [cell addSubview:subBtn]; 
    } 

    // we're loading the value from the array each time the cell is displayed. 
    cell.textLabel.text = [cellLabelValues objectAtIndex:indexPath.row]; 

return cell; 
} 

- (IBAction)addLabelText:(int)currentRow{  
    NSString *newValue = [NSString stringWithFormat:@"%d",[[[cellLabelValues objectAtIndex:currentRow] intValue] +1]; 
    // we update the value in the array since this is the source of the data for the cell 
    [cellLabelValues replaceObjectAtIndex:currentRow withObject:newValue]; 
    // now reload to get the new value 
    [myTableView reloadData]; 
}