how to make UITextView height dynamic according to text length?

Question

As you can see in this image

the UITextView changes it\'s height according to the text length, I want to make it adjust it\'s height according to the te

Answer 1

If your textView is allowed to grow as tall as the content, then

textView.isScrollEnabled = false

should just work with autolayout.

If you want to remain the textView to be scrollable, you need to add an optional height constraint,

internal lazy var textViewHeightConstraint: NSLayoutConstraint = {
  let constraint = self.textView.heightAnchor.constraint(equalToConstant: 0)
  constraint.priority = .defaultHigh
  return constraint
}()

public override func layoutSubviews() {
  super.layoutSubviews()

  // Assuming there is width constraint setup on the textView.
  let targetSize = CGSize(width: textView.frame.width, height: CGFloat(MAXFLOAT))
  textViewHeightConstraint.constant = textView.sizeThatFits(targetSize).height
}

The reason to override layoutSubviews() is to make sure the textView is laid out properly horizontally so we can rely on the width to calculate the height.

Since the height constraint is set to a lower priority, if it runs out space vertically the actual height of the textView will be less than the contentSize. And the textView will be scrollable.

Answer 2

Declaration here

    fileprivate weak var textView: UITextView!

Call your setupview here

    override func viewDidLoad() {
        super.viewDidLoad()

         setupViews()
    }

Setup here

    fileprivate func setupViews() {

    let textView = UITextView()
    textView.translatesAutoresizingMaskIntoConstraints = false
    textView.text = "your text here"
    textView.font = UIFont.poppinsMedium(size: 14)
    textView.textColor = UIColor.brownishGrey
    textView.textAlignment = .left
    textView.isEditable = false
    textView.isScrollEnabled = false
    textView.textContainerInset = UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)

   self.view.addSubview(textView)

   self.textView = textView

   setupConstraints()

   }

Setup constraints here

   fileprivate func setupConstraints() {

    NSLayoutConstraint.activate([

        textView.topAnchor.constraint(equalTo: view.topAnchor, constant: 20),
        textView.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 20),
        textView.rightAnchor.constraint(equalTo: view.rightAnchor, constant: -20),
        textView.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: -20),
        textView.heightAnchor.constraint(greaterThanOrEqualToConstant: 150),
        ])
  }

Answer 3

Followed by DeyaEldeen's answer.
In my case. I grow the textview height automatically by adding

swift 3

textView.translatesAutoresizingMaskIntoConstraints = false textView.isScrollEnabled = false

Answer 4

In my project, the view controller is involved with lots of Constraints and StackView, and I set the TextView height as a constraint, and it varies based on the textView.contentSize.height value.

step1: get a IB outlet

@IBOutlet weak var textViewHeight: NSLayoutConstraint!

step2: use the delegation method below.

extension NewPostViewController: UITextViewDelegate {
     func textViewDidChange(_ textView: UITextView) {
          textViewHeight.constant = self.textView.contentSize.height + 10
     }
}

Answer 5

Tested on Xcode 11.2.1, Swift 5.1:

All I had to do was:

1. Set the constraints to the top, left, and right of the textView.
2. Disable scrolling in Storyboard.

Doing so allowed autolayout to kick in and dynamically size the textView based on its content.

Answer 6

Better yet swift 4 add as an extension:

extension UITextView {
    func resizeForHeight(){
        self.translatesAutoresizingMaskIntoConstraints = true
        self.sizeToFit()
        self.isScrollEnabled = false
    }
}