如何将UITableViewCell放置在屏幕底部？ [英] How to position UITableViewCell at bottom of screen?

问题描述

在 UITableViewView 中有一到三个 UITableViewCell 。有没有办法始终将单元格放在 reloadData 之后的屏幕底部？

There are one to three UITableViewCells in a UITableViewView. Is there a way to always position the cell(s) at the bottom of screen after reloadData?

+----------------+     +----------------+     +----------------+
|                |     |                |     |                |
|                |     |                |     |                |
|                |     |                |     |                |
|                |     |                |     | +------------+ |
|                |     |                |     | |   cell 1   | |
|                |     |                |     | +------------+ |
|                |     | +------------+ |     | +------------+ |
|                |     | |   cell 1   | |     | |   cell 2   | |
|                |     | +------------+ |     | +------------+ |
| +------------+ |     | +------------+ |     | +------------+ |
| |   cell 1   | |     | |   cell 2   | |     | |   cell 3   | |
| +------------+ |     | +------------+ |     | +------------+ |
+----------------+     +----------------+     +----------------+

推荐答案

我已经

最新技术使用自动布局和自动调整单元格大小，因此先前的答案将不再起作用。我对该解决方案进行了重新设计，使其与现代功能配合使用，并创建了一个示例项目放在GitHub上。

The latest technique uses autolayout and self-sizing cells so the previous answer would no longer work. I reworked the solution to work with the modern features and created a sample project to put on GitHub.

而不是计算每一行的高度，这会导致额外的工作，此代码改为获取最后一行的帧，以便可以计算从顶部插入的内容。

Instead of counting up the height of each row, which is causes additional work, this code instead gets the frame for the last row so that the content inset from the top can be calculated. It leverages what the table view is already doing so no additional work is necessary.

该代码也仅设置顶部插入物，以防键盘或键盘底部被插入。另一个覆盖。

This code also only sets the top inset in case the bottom inset is set for the keyboard or another overlay.

请在GitHub上报告所有错误或提交改进，我将更新此示例。

Please report any bugs or submit improvements on GitHub and I will update this sample.

GitHub： https://github.com/brennanMKE/BottomTable

- (void)updateContentInsetForTableView:(UITableView *)tableView animated:(BOOL)animated {
    NSUInteger lastRow = [self tableView:tableView numberOfRowsInSection:0];
    NSUInteger lastIndex = lastRow > 0 ? lastRow - 1 : 0;

    NSIndexPath *lastIndexPath = [NSIndexPath indexPathForItem:lastIndex inSection:0];
    CGRect lastCellFrame = [self.tableView rectForRowAtIndexPath:lastIndexPath];

    // top inset = table view height - top position of last cell - last cell height
    CGFloat topInset = MAX(CGRectGetHeight(self.tableView.frame) - lastCellFrame.origin.y - CGRectGetHeight(lastCellFrame), 0);

    UIEdgeInsets contentInset = tableView.contentInset;
    contentInset.top = topInset;

    UIViewAnimationOptions options = UIViewAnimationOptionBeginFromCurrentState;
    [UIView animateWithDuration:animated ? 0.25 : 0.0 delay:0.0 options:options animations:^{
        tableView.contentInset = contentInset;
    } completion:^(BOOL finished) {
    }];
}

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