Xcode 如果段控制器发生更改，如何删除表视图中的子视图（按钮）？

我面临的问题是，我在UItable视图中对控制器进行了分段，选择索引0，它应该显示按钮（并且工作正常）。问题是，当我选择索引1时，表视图更改了它的内容，这里的按钮都应该被删除。如果我添加这些语句，它只会删除最后一个单元格中的按钮

这些语句只删除最后一个单元格的按钮

---

---

调用removefromsuperview时，downloadButton从未添加到视图中。每次使用电池时，它都会重新生成按钮不断堆积

您必须保存旧按钮，而不是创建新按钮并忘记旧按钮：）

e、 g:

---

请关注未来的代码格式化。使阅读变得非常困难：-）如果我这样做，按钮将显示在两个分段视图的最后一个单元格中。如果您在未显示给我们的代码的某些部分有错误：）。这将正确地在单元格中添加一个按钮。我在UItable视图中对控制器进行了分段，选择索引0，它将显示按钮（并且工作正常）。问题是，当我选择索引1时，表视图更改了它的内容，这里的按钮都应该被删除。如果我添加这些语句，它只会删除最后一个单元格中的按钮[cell willRemoveSubview:downloadButton]；[downloadButton removeFromSuperview]；downloadButton.hidden=是

        [cell willRemoveSubview:downloadButton];
        [downloadButton removeFromSuperview];
        downloadButton.hidden=YES;

-(void)configureCell: (UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath {
    downloadButton = [UIButton buttonWithType:UIButtonTypeCustom] ;
    [downloadButton setFrame:CGRectMake(250,8,30,30)];
    [downloadButton setTag :indexPath.row];
    [downloadButton setImage:[UIImage imageNamed:@"DownloadLesson.png"] forState:UIControlStateNormal];
    [downloadButton addTarget:self action:@selector(cellButton:) forControlEvents: UIControlEventTouchUpInside];

    if (segOL.selectedSegmentIndex==0) {
        [cell addSubview:downloadButton];
    } else {
        [cell willRemoveSubview:downloadButton];
        [downloadButton removeFromSuperview];
        downloadButton.hidden=YES;
    }
}
- (IBAction)cellButton:(id)sender {

    UIButton *play = sender;   
    NSLog(@"Number of row %d", play.tag]);
}

@interface CellClass : UITableViewCell {
    UIButton *downloadButton;
}

...

-(void)configureCell: (UITableViewCell *)cell atIndexPath:(NSIndexPath *)indexPath {
    if(!downloadButton) {
        downloadButton = [UIButton buttonWithType:UIButtonTypeCustom] ;
        [downloadButton setFrame:CGRectMake(250,8,30,30)];
        [downloadButton setTag :indexPath.row];
        [downloadButton setImage:[UIImage imageNamed:@"DownloadLesson.png"] forState:UIControlStateNormal];
        [downloadButton addTarget:self action:@selector(cellButton:) forControlEvents: UIControlEventTouchUpInside];
    }        
    if (segOL.selectedSegmentIndex==0) {
        [cell addSubview:downloadButton];
    } else {
        [cell willRemoveSubview:downloadButton];
        [downloadButton removeFromSuperview];
        downloadButton.hidden=YES;
    }
}
- (IBAction)cellButton:(id)sender {

    UIButton *play = sender;

    NSLog(@"Number of row %d", play.tag]);
}