问题描述

从 Apple 示例PageControl"我们可以知道 UIPageControl 可用于控制页面在滚动视图中的移动.

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

由于 UITableView 是 UIScrollView 的子类，我想使用 UIPageControl 来控制表格视图单元格的移动，就像在PageControl"中一样.

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

但是找不到任何委托接口让我这样做.

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

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 以编程方式选择行

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];
}

推荐答案

确实有可能，但你为什么想要这个?表格视图垂直滚动，而页面控件具有水平布局，因此它可能看起来/感觉很奇怪.

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.

无论如何，如果您真的想这样做，请将您的视图控制器添加为页面控件的目标:

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];

然后在action中实现滚动:

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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