ios - 滚动 UITableviewcells 时 IndexPath 值正在改变？

Question

从 first view controller 移动到 second view controller 时，我将索引路径保存在数组中，并在 first view controller 中加载表时返回，如果当前索引路径在保存的索引路径数组中，我必须创建一个自定义附件按钮。

但是，当滚动 UITableview 以及所需的单元格时，另一个单元格也会获得自定义按钮。当我在滚动时打印 NSindexPaths 时，我得到的是随机值而不是正常值。

对于以上内容，我使用以下代码:

- (UITableViewCell *)tableView: (UITableView *)tableView cellForRowAtIndexPath: (NSIndexPath *)indexPath
{
   // NSLog(@"newdata value is =%d",newData);
    AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
    UITableViewCell *cell = [self.positionsTable dequeueReusableCellWithIdentifier:@"playersInPosition"];
    if (cell == nil) {
        cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"playersInPosition"]autorelease];
    }
    UILabel *lblName = (UILabel *)[cell viewWithTag:100];
    [lblName setText:[inputData objectAtIndex:[indexPath row]]];
    UILabel *pname = (UILabel *)[cell viewWithTag:102];
    [pname setText:[appDelegate.playersNFL objectAtIndex:[indexPath row]]];

      for (NSIndexPath *object in appDelegate.indexPathList) {
    if ([object isEqual:indexPath]) {
        NSLog(@"saved index path values are =%@",appDelegate.savedIndexPath);
        UIButton *button = [self ChangeAccessoryButtonStyle:appDelegate.indexPathList[0]];
        cell.accessoryView = button;
    }
    }
        return cell;
}

Answer 1

我不记得文档中有任何部分说索引路径是要被 TableView 重用的，然后将对象与 designed function 进行比较可能是个好主意。 :

compare:

Indicates the depth-first traversal order of the receiving index path and another index path.

-(NSComparisonResult)compare:(NSIndexPath *)indexPath

Parameters

indexPath Index path to compare. This value must not be nil. If the value is nil, the behavior is undefined.

Return Value

The depth-first traversal ordering of the receiving index path and indexPath.

• NSOrderedAscending: The receiving index path comes before indexPath.
• NSOrderedDescending: The receiving index path comes after indexPath.
• NSOrderedSame: The receiving index path and indexPath are the same index path.

Availability

Available in iOS 2.0 and later.

Declared In

NSIndexPath.h