更改方向时更改UITableViewCell高度 [英] Change UITableViewCell Height on Orientation Change

问题描述

我有一个UITableView，其中的单元格包含高度可变的UILabel.我可以使用sizeWithFont:constrainedToSize:lineBreakMode:来计算标签需要的最小高度，当第一次加载表格视图时，该高度可以正常工作.当我旋转表格视图时，单元格会变宽(这意味着显示内容所需的行更少).有什么办法可以在方向更改动画期间或紧接之前或之后由UITableView重新确定单元格的高度吗?谢谢.

I have a UITableView with cells containing variable-height UILabels. I am able to calculate the minimum height the label needs to be using sizeWithFont:constrainedToSize:lineBreakMode:, which works fine when the table view is first loaded. When I rotate the table view the cells become wider (meaning there are fewer lines required to display the content). Is there any way I can have the height of the cells redetermined by the UITableView during the orientation change animation or immediately before or after? Thank you.

推荐答案

您的UITableViewController可以实现tableView:heightForRowAtIndexPath:方法来指定特定行的行高，并且可以查看当前方向([[UIDevice currentDevice] orientation])决定返回什么高度.

Your UITableViewController can implement the tableView:heightForRowAtIndexPath: method to specify the row height for a particular row, and it can look at the current orientation ([[UIDevice currentDevice] orientation]) to decide what height to return.

要确保在方向更改时再次调用tableView:heightForRowAtIndexPath:，您可能需要 按照这个问题，然后致电[tableView reloadData].

To make sure tableView:heightForRowAtIndexPath: gets called again when the orientation changes, you'll probably need to detect the orientation change as described in this question, and call [tableView reloadData].

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