`MaxHeightTextView` overrides `UITextView`'s `intrinsicContentSize` and `layoutSubviews` to allow it to grow to fit its content size, but only up to a specified max height. Once the text view reaches this max height, its content will start to scroll. Use with AutoLayout. Specifically, set up a fixed width, and two height constraints with greater…

MaxHeightTextView.swift

//
//  File.swift
//  Kalido
//
//  Created by Phlippie Bosman on 2016/11/17.
//  Copyright © 2016 Kalido. All rights reserved.
//

class MaxHeightTextView: UITextView {
    open var maxHeight: CGFloat?
    open var fixedTextViewWidth: CGFloat?
    
    private var calculatedContentSize: CGSize {
        var width: CGFloat = fixedTextViewWidth ?? bounds.size.width
        width += ((textContainerInset.left + textContainerInset.right) / 2)
        let comfySize = CGSize(width: width, height: CGFloat.greatestFiniteMagnitude)
        return sizeThatFits(comfySize)
    }
    
    override var intrinsicContentSize: CGSize {
        var size = self.calculatedContentSize
        size.width += (textContainerInset.left + textContainerInset.right) / 2.0
        size.height += (textContainerInset.top + textContainerInset.bottom) / 2.0
        if let max = maxHeight {
            size.height = min(size.height, max)
        }
        return size
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        if !self.bounds.size.equalTo(intrinsicContentSize) {
            self.invalidateIntrinsicContentSize()
        }
    }
}

thank you so much!

Thank you! I've been trying solutions for hours, this is the first implementation that works.