Eureka: Dynamic row height for TextAreaRows possible?

[ffittschen]

Hi,

I was wondering, if it is possible to set the height of a TextAreaRow to an automatic height based on the content. Usually I do this with content hugging priorities etc. in a storyboard, but your cell.height is of type (() -> CGFloat)? so if I want to change the height I have to pass a closure which calculates it?

Best regards

[ffittschen]

This is what I did to solve this:

CustomFormViewController.swift:

override func viewDidLoad() {
    super.viewDidLoad()

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardDidChangeFrame:", name: UIKeyboardWillChangeFrameNotification, object: nil)

    form
        +++ Section()
        <<< TextAreaRow("Story") { row in
            row.placeholder = row.tag
        }
        .onChange{ [weak self] row in
            row.cell.height = {
                let textViewHeight = row.cell.textView.sizeThatFits(CGSize(width: row.cell.textView.bounds.width, height: CGFloat.max)).height

                var maxHeight: CGFloat = 250.0
                if let navigationBarHeight = self?.navigationController?.navigationBar.bounds.height,
                    let keyboardHeight = self?.keyboardHeight {
                        maxHeight = UIScreen.mainScreen().bounds.height - navigationBarHeight - keyboardHeight
                }

                return textViewHeight.clamped(min: 110.0, max: maxHeight)
            }

            if let thisIndexPath = self?.tableView?.indexPathForCell(row.cell) {
                self?.tableView?.scrollToRowAtIndexPath(thisIndexPath, atScrollPosition: .Bottom, animated: false)
            }

            self?.tableView?.beginUpdates()
            self?.tableView?.endUpdates()
        }
}

// ...

func keyboardDidChangeFrame(notification: NSNotification) {
    let keyboardScreenEndFrame = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue()
    let keyboardViewEndFrame = view.convertRect(keyboardScreenEndFrame, fromView: view.window)

    keyboardHeight = keyboardViewEndFrame.height
}

Comparable+Extension.swift:

extension Comparable {
    func clamped(min min: Self, max: Self) -> Self {
        if self < min {
            return min
        }
        if self > max {
            return max
        }
        return self
    }
}