TypewriterEffect.cs

public class TypewriterEffect : MonoBehaviour
    {
        public TextMeshProUGUI textMesh;
        public float typeSpeed = 0.025f;

        public Action OnTypewriterCompleted;

        private int currentCursorLocation = 0;

        public void SetText(string text)
        {
            textMesh.text = text;
            textMesh.maxVisibleCharacters = 0;
        }

        public void SetTextImmediate(string text)
        {
            textMesh.text = text;
            currentCursorLocation = textMesh.textInfo.characterCount;
            textMesh.maxVisibleCharacters = currentCursorLocation;
        }

        public void PlayText()
        {
            currentCursorLocation = 0;
            StartCoroutine(Play());
        }

        public void CompleteText()
        {
            StopCoroutine(Play());
            currentCursorLocation = textMesh.textInfo.characterCount;
            textMesh.maxVisibleCharacters = currentCursorLocation;
        }

        public bool IsPlaying()
        {
            return currentCursorLocation < textMesh.textInfo.characterCount;
        }

        private IEnumerator Play()
        {
            yield return new WaitForSeconds(typeSpeed);
            while (currentCursorLocation < textMesh.textInfo.characterCount)
            {
                currentCursorLocation++;
                textMesh.maxVisibleCharacters = currentCursorLocation;
                yield return new WaitForSeconds(typeSpeed);
            }

            OnTypewriterCompleted?.Invoke();
        }
    }