如何使 UITableView 适合内容的大小

Question

I have a UITableView (let's call it tbl_A) inside a table view cell whose height is dynamic and set by UITableViewAutomaticDimension . tbl_A's cell height is also dynamic, and I know tbl_A's data won't be too much. So I want tbl_A to be scroll disabled and its frame.size equals its content size . I tried to set tbl_A's frame.size.height = tbl_A.contentSize.height, unfortunately, the height is wrong.

By the way, I don't have to use UITableView to accomplish this task. I just want to a way to display all data. Any suggestions?

This is the effect I want to achieve:

Answer 1

Simple ;)

override var intrinsicContentSize: CGSize {
    return contentSize
}

Answer 2

Based on @Emad's answer but with the important addition to invalidate the intrinsic content size if the contentSize changes.

class ContentWrappingTableView: UITableView {

  override var intrinsicContentSize: CGSize {
    return self.contentSize
  }

  override var contentSize: CGSize {
    didSet {
        self.invalidateIntrinsicContentSize()
    }
  }
}

Answer 3

As long as scrolling is locked, you can use the following to match the tableView's layout dynamically.:

    let size = actionsViewController.view.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize)
    actionsViewController.view.frame.size = size
    actionsViewController.preferredContentSize = size

The following presents a way to have auto layout calculate the height for you and provide you a size based on restrictions you pass in. Another way could be the following:

    CGFloat leftViewHeight = 0;
    if (self.isExpanded) {
        [self.lineItemLineNumberListTableViewController.tableView layoutIfNeeded];
        UITableView *tableView = self.lineItemLineNumberListTableViewController.tableView;
        CGSize tableViewContentSize = tableView.contentSize;
        leftViewHeight = tableViewContentSize.height;
    }

self.leftViewHeightConstraint.constant = leftViewHeight;

I had previously used the above to expand dynamically resizing cells with dynamic subviews within them. This configures a height constraint based on the content size AFTER reloading the tableView's content to ensure the content was loaded prior to adjusting the size.

Answer 4

1. For your case you can also use scrollView.
2. In that scrollView while adding each subcell keep track of each subcell by adding each subcell's height ( take variable as referenceHeight )
3. finally set the scrollview height by calculated height(referenceHeight)

Answer 5

Below is method to find tableView's content size.

- (CGFloat)tableViewHeightOfTable:(UITableView *)table
{
   [table layoutIfNeeded];
   return [table contentSize].height;
}

Make sure that you call this method after reloading your table like below code.

[YourTable reloadData];
YourTable.frame.size.height = [self tableViewHeightOfTable:YourTable];

Answer 6

1) Add to your class reference to constraint:

var heightC: NSLayoutConstraint!

2) Disable scroll and add height constraint:

tableView.scrollEnabled = false
heightC = tableView.autoSetDimension(.Height, toSize: 20) // using PureLayout library

3) override viewDidLayoutSubviews of your controller:

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    heightC.constant = tableView.contentSize.height
}

and set height constraint "constant" attribute to tableview content height.

4) on data refresh (for example when item count changes from 0 to more) just force main controller view to layout:

view.setNeedsLayout()

Answer 7

在您的情况下 tableview 是最好的解决方案，您可以使用不同的 uitableviewcells 和部分，并且可以在 cellForRowAtIndexPath 中加载它。