如何将UITableViewCell的高度调整为内部UITextView的内容?

问题描述

在故事板上，我有一个UITableView和动态生成的UITableViewCell.每个单元格包含2个标签和1个文本视图:

In my story board I have a UITableView with dynamically generated UITableViewCells. Each cell contains 2 labels and 1 text view:

我有一个代码可以将文本字段的大小调整为文本量:

I have a code that adjust the size of the textfield to the amount of text:

let fixedWidth = cell.myComment.frame.size.width
cell.myComment.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.max))
let newSize = cell.myComment.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.max))
var newFrame = cell.myComment.frame
newFrame.size = CGSize(width: max(newSize.width, fixedWidth), height: newSize.height)
cell.myComment.frame = newFrame;

并且工作正常，当我将textView的背景色设置为红色时，我会看到:

and it works fine, when I set a background color of my textView to red I see:

和单元格本身-我在此处设置大小:

and the cell itself - I'm setting the size in here:

func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat
{
     if indexPath.row == 0 {
         return 100//this is my static cell
     }
     else {
         return 117; //for now it's hardcoded - how can I set this value dynamically based on content?
     }
}

正如我在上面的评论中所写-如何根据文本视图中的文本量动态设置单元格的高度?

So as I wrote in the comment above - how can I set the height of the cell dynamically based on the amount of text in the text view?

推荐答案

获取自定义表格单元格(基于自动布局，我建议)的关键如下:

The key to getting self-sizing table cells (autolayout-based, which I recommend) is as follows:

• 将子视图添加到UITableViewCell
的contentView
• 在子视图和contentView之间提供约束，以使子视图到达表单元格的所有边缘.在您的情况下，这可能意味着将UITextView的leading，trailing，top和bottom边缘与contentView的相应边缘对齐.
• 将行高设置为UITableViewAutomaticDimension，而不是硬编码的CGFloat.
• 在控制器中的某个位置，用tableView.estimatedRowHeight = x提供高度估计(硬编码常数很好，这是为了提高性能).

• Add your subviews to the contentView of the UITableViewCell
• Provide constraints between your subviews and the contentView such that your subviews reach all edges of the table cell. In your case, this probably means aligning the leading, trailing, top, and bottom edges of your UITextView to the corresponding edges of the contentView.
• Set the row height to UITableViewAutomaticDimension instead of a hardcoded CGFloat.
• Somewhere in your controller, provide an estimation of the height with tableView.estimatedRowHeight = x (a hard coded constant is fine, this is for performance).

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