Auto snap to grid in Unity If you need to auto snap a gameObject to the grid in unity this script will help you. Usage: Create a Editor folder in your assets folder. Add the AutoSnap.cs script to the Editor folder. To open press Command + L (Mal), Control + L (PC) Source: http://answers.unity3d.com/questions/148812/is-there-a-toggle-for-snap-to-…

AutoSnap.cs

using UnityEngine;
using UnityEditor;
 
public class AutoSnap : EditorWindow
{
    private Vector3 prevPosition;
    private bool doSnap = true;
    private float snapValue = 1;
 
    [MenuItem( "Edit/Auto Snap %_l" )]
 
    static void Init()
    {
       var window = (AutoSnap)EditorWindow.GetWindow( typeof( AutoSnap ) );
       window.maxSize = new Vector2( 200, 100 );
    }
 
    public void OnGUI()
    {
       doSnap = EditorGUILayout.Toggle( "Auto Snap", doSnap );
       snapValue = EditorGUILayout.FloatField( "Snap Value", snapValue );
    }
 
    public void Update()
    {
       if ( doSnap
         && !EditorApplication.isPlaying
         && Selection.transforms.Length > 0
         && Selection.transforms[0].position != prevPosition )
       {
         Snap();
         prevPosition = Selection.transforms[0].position;
       }
    }
 
    private void Snap()
    {
       foreach ( var transform in Selection.transforms )
       {
         var t = transform.transform.position;
         t.x = Round( t.x );
         t.y = Round( t.y );
         t.z = Round( t.z );
         transform.transform.position = t;
       }
    }
 
    private float Round( float input )
    {
       return snapValue * Mathf.Round( ( input / snapValue ) );
    }
}

Replace the Snap method with this to add support for RecTransforms (UI)

private void Snap()
    {
        foreach ( var transform in Selection.transforms )
        {
            RectTransform rectTrans = transform.transform as RectTransform;
            if (rectTrans) {
                var pos = rectTrans.anchoredPosition;
                pos.x = Round(pos.x);
                pos.y = Round(pos.y);
                rectTrans.anchoredPosition = pos;
                var size = rectTrans.sizeDelta;
                size.x = Round(size.x);
                size.y = Round(size.y);
                rectTrans.sizeDelta = size;
            }
            else {
                var t = transform.transform.position;
                t.x = Round( t.x );
                t.y = Round( t.y );
                t.z = Round( t.z );
                transform.transform.position = t;
            }
        }
    }