Dynamically change cell's height while typing

问题:

I'm trying to have a UITableView with several cells types. One of my cells needs to dynamically change his height while typing text in it. Here is the code for change the cell's height (in the cell's class), which works good:

func textViewDidChange(_ textView: UITextView)
{
    var newFrame:CGRect = noteTextView.frame
    newFrame.size.height = noteTextView.contentSize.height
    noteTextView.frame = newFrame
    self.frame = CGRect(x: self.frame.origin.x, y: self.frame.origin.y, width: self.frame.width, height: noteTextView.contentSize.height)
}

But the cell is overlaying the cell under him. Nor adding those lines on the parent tableView member helped:

mParentTableView.setNeedsLayout()
mParentTableView.layoutIfNeeded()

Any idea how to tell the tableView recalc its contained cells sizes ?

(XCode 9, Swift 4)

回答1:

Using tableView's [tableView beginUpdates] and [tableView endUpdates] will solve this issue. See this answer for more information.

回答2:

Set delegate On Your UITableViewCell like that

var textDidChanges: (() -> Void)? = nil

func textViewDidChange(_ textView: UITextView) {
    textDidChanges?()
}

and Your tableView cellForRowAt

cell.textDidChanges = {
    self.tableView.beginUpdates()
    self.tableView.endUpdates()
} 

How to make a UITableViewCell with a UITextView inside, that dynamically adjust its height, on the basis of the UITextView?