是否可以使用UIPageControl来控制UITableView的移动？

发布于 2024-11-06 23:30:06 字数 912 浏览 0 评论 0原文

从Apple示例“PageControl”中我们可以知道UIPageControl可以用来控制scrollview中页面的移动。

由于 UITableView 是 UIScrollView 的子类，我想使用 UIPageControl 来控制表视图单元格的移动，就像在“PageControl”中一样。

但找不到任何委托接口供我执行此操作。

问题是：

可以这样做吗？为什么？

谢谢

让我回答我的问题：

以编程方式选择和滚动

清单 6-5 以编程方式选择一行

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)newIndexPath {
    NSIndexPath *scrollIndexPath;
    if (newIndexPath.row + 20 < [timeZoneNames count]) {
        scrollIndexPath = [NSIndexPath indexPathForRow:newIndexPath.row+20 inSection:newIndexPath.section];
    } else {
        scrollIndexPath = [NSIndexPath indexPathForRow:newIndexPath.row-20 inSection:newIndexPath.section];
    }
    [theTableView selectRowAtIndexPath:scrollIndexPath animated:YES
                        scrollPosition:UITableViewScrollPositionMiddle];
}

原文

From Apple sample "PageControl" we can know that UIPageControl can be used to control movement of pages in scrollview.

As UITableView is subclass of UIScrollView,I want to use UIPageControl to control the movement of table view cell just like in "PageControl".

But can not find any interface of delegate for me to do that.

Question is :

Is that possible to do this ? And Why ?

Thanks

Let me answer my question with :

Programmatically Selecting and Scrolling

Listing 6-5 Programmatically selecting a row

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)newIndexPath {
    NSIndexPath *scrollIndexPath;
    if (newIndexPath.row + 20 < [timeZoneNames count]) {
        scrollIndexPath = [NSIndexPath indexPathForRow:newIndexPath.row+20 inSection:newIndexPath.section];
    } else {
        scrollIndexPath = [NSIndexPath indexPathForRow:newIndexPath.row-20 inSection:newIndexPath.section];
    }
    [theTableView selectRowAtIndexPath:scrollIndexPath animated:YES
                        scrollPosition:UITableViewScrollPositionMiddle];
}

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离笑几人歌 2024-11-13 23:30:06

这当然是可能的，但你为什么想要这个呢？表视图垂直滚动，而页面控件具有水平布局，因此它可能看起来/感觉很奇怪。

无论如何，如果您确实想这样做，请将视图控制器添加为页面控件的目标：

[pageControl addTarget:self action:@selector(pageChanged:) forControlEvents:UIControlEventValueChanged];

然后在操作中实现滚动：

- (void)pageChanged:(UIPageControl *)sender {
    float scrollPosition = ((float)sender.currentPage / (float)sender.numberOfPages) * tableView.contentSize.height;
    [tableView scrollRectToVisible:CGRectMake(0, scrollPosition, 1, 1) animated:YES];
}

It sure is possible, but why would you want this? A table view scrolls vertically, while a page control has a horizontal layout, so it would probably look/feel weird.

Anyway, if you really want to do this, add your view controller as a target of the page control:

[pageControl addTarget:self action:@selector(pageChanged:) forControlEvents:UIControlEventValueChanged];

Then implement the scrolling in the action:

- (void)pageChanged:(UIPageControl *)sender {
    float scrollPosition = ((float)sender.currentPage / (float)sender.numberOfPages) * tableView.contentSize.height;
    [tableView scrollRectToVisible:CGRectMake(0, scrollPosition, 1, 1) animated:YES];
}

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