How to change the TextView height dynamicly to a threshold and then allow scrolling?

Question

I have a TextView that has a constraint of min height of 33. The scroll is disabled from the storyboard. The TextView should increase in height based on the content until it

Answer 1

Create a class that inherits from UITextView and add the following into the class:

class CustomTextView: UITextView, UITextViewDelegate {

    override init(frame: CGRect, textContainer: NSTextContainer?) {
        super.init(frame: frame, textContainer: textContainer)

        delegate = self
    }

    var maxHeight: CGFloat = 200

    override var intrinsicContentSize: CGSize {
        var size = super.intrinsicContentSize
        if size.height > maxHeight {
            size.height = maxHeight
            isScrollEnabled = true
        } else {
            isScrollEnabled = false
        }
        return size
    }

    override var text: String! {
        didSet {
            invalidateIntrinsicContentSize()
        }
    }

    func textViewDidChange(_ textView: UITextView) {
        invalidateIntrinsicContentSize()
    }

}

Note: - You can initialize maxHeight to infinity and set maxHeight after creating the CustomTextView. This class can be reused anywhere it is needed in the app, and the max height can be modified for different scenarios.