Putting a multiline InputField in a Scroll Rect?

I've had a simmilar issue and compiled a workaround until Unity fixes the InputField functionality. All the combinations of layous/content fitters didn't yield proper display of the last line. The only downside is that you can't fix the height of the input field without a ScrollRect component, also in the example.

Also, this example doesn't cover the ScrollRect following the caret nor the selection in the InputField, if someone does that please post it here! :)

HACKY SOLUTION:

InputFieldMod.cs - http://pastebin.com/AHggHUMX

Example - http://illa3d.com/unity/inputfield_mod_v1.0.unitypackage

I was having a similar problem. The solution I found was simply create a game-object, obj1, to assign as a parent to the game-object with the input-field component, obj2. Then have the scroll-rect move the parent, obj1, which contains the child with the input-field component, obj2.

--->ScrollRect
-------->Obj1 <---- ScrollRect moves this one
-------------->Obj2 <--- This one has input field component

This is my modified version of InputFieldMod, removing the highlight and take into account for canvas scale, etc:

 using UnityEngine;
 using UnityEngine.UI;
 using UnityEngine.EventSystems;
 using UnityEngine.Events;
 using System.Collections;
 
 namespace SweatyChair.UI
 {
 
     [ExecuteInEditMode]
     [RequireComponent(typeof(InputField))]
     public class InputFieldScroller : UIBehaviour
     {
 
         [Tooltip("The default row count in  InputField, this will be ignored if a ScrollRect is assigned")]
         [Range(1, 50)] [SerializeField] private int _minRowCount = 1;
 
         [Tooltip("Scroll rect parent")]
         [SerializeField] private ScrollRect _scrollRect = null;
 
         private InputField _inputField;
         private RectTransform _rectTransform;
 
         // Layout
         private LayoutElement _layoutElement;
         private HorizontalOrVerticalLayoutGroup _parentLayoutGroup;
 
         private Vector2 _scrollRectSize;
         private float _canvasScaleFactor = 1;
 
         protected override void Awake()
         {
             _inputField = GetComponent<InputField>();
             _inputField.onValueChanged.AddListener(new UnityAction<string>(ResizeInput));
             _rectTransform = GetComponent<RectTransform>();
             CanvasScaler canvasScaler = GetComponentInParent<CanvasScaler>();
             if (canvasScaler)
                 _canvasScaleFactor = canvasScaler.scaleFactor;
             _layoutElement = GetComponent<LayoutElement>();
             _parentLayoutGroup = transform.parent.GetComponent<HorizontalOrVerticalLayoutGroup>();
         }
 
         // Resize input field recttransform
         private void ResizeInput()
         {
             ResizeInput(_inputField.text);
         }
 
         private void ResizeInput(string text)
         {
             // Current text settings
             TextGenerationSettings settings = _inputField.textComponent.GetGenerationSettings(_inputField.textComponent.rectTransform.rect.size);
             settings.generateOutOfBounds = false;
             settings.scaleFactor = _canvasScaleFactor; // HACK: scale factor of settings not following the global scale factor... make sure it do
 
             // Get text padding (min max vertical offset for size calculation)
             float vecticalOffset = _inputField.placeholder.rectTransform.offsetMin.y - _inputField.placeholder.rectTransform.offsetMax.y;
 
             // Preferred text rect height
             float preferredHeight = (new TextGenerator().GetPreferredHeight(text, settings) / _canvasScaleFactor) + vecticalOffset + 10;
             float minHeight;
 
             // Default text rect height (fit to scroll parent or expand to fit text)
             if (_scrollRect)
                 minHeight = _scrollRect.GetComponent<RectTransform>().rect.size.y;
             else
                 minHeight = ((new TextGenerator().GetPreferredHeight("", settings) * _minRowCount) / _canvasScaleFactor) + vecticalOffset;
 
             // Current text rect height
             float currentHeight = _inputField.textComponent.rectTransform.rect.height;
 
             // Force resize
             if (Mathf.Abs(currentHeight - preferredHeight) > Mathf.Epsilon) {
                 float newHeight = Mathf.Max(preferredHeight, minHeight); // At least min height
                 if (_parentLayoutGroup && _layoutElement)
                     _layoutElement.preferredHeight = newHeight;
                 else
                     _rectTransform.sizeDelta = new Vector2(_rectTransform.rect.width, newHeight);
             }
 
             // Scroll to bottom if just added new line
             if (gameObject.activeInHierarchy && _inputField.caretPosition == _inputField.text.Length && _inputField.text.Length > 0 && _inputField.text[_inputField.text.Length - 1] == '\n')
                 StartCoroutine(ScrollToBottomCoroutine());
         }
 
         // Update scroll rect position (after Layout was rebuilt)
         private IEnumerator ScrollToBottomCoroutine()
         {
             yield return new WaitForEndOfFrame();
             if (_scrollRect != null)
                 _scrollRect.verticalNormalizedPosition = 0;
         }
 
     }
 
 }