Help with objects in editor script

Unity Engine
1

Hi all, i’m working on my first editor script which finds objects with a tag and then spawns an object in its place.
The bug I have now is
ReplacementItem = EditorGUILayout.ObjectField(ReplacementItem,GameObject);
outputs “Assets/TileSwap.cs(28,80): error CS0119: Expression denotes a type', where a variable’, value' or method group’ was expected”

I have a few other problems with this code , like
Instantiate(ReplacementItem, replaceTile.transform.position, replaceTile.transform.rotation) as GameObject;
isn’t working for some reason, but I’d be greatful if someone could help me with the first problem …

using UnityEngine;
using System.Collections;
using UnityEditor ;
//[ExecuteInEditMode]
//[CustomEditor(TileSwap)]

public class TileSwap : EditorWindow{
	
public string SwapTag ;
public GameObject ReplacementItem ; 
	public GameObject[] replaceTiles;
//public GameObject[] replaceTiles = GameObject.FindGameObjectsWithTag(SwapTag);
 public GameObject Test ; 

[MenuItem("Window/TileSwaper")]
public static void ShowWindow()
	{
		//Show existing window instance. If one doesn't exist, make one.
		EditorWindow.GetWindow(typeof(TileSwap));
	}	

	
	
	void OnGUI()

   {
		
		 EditorGUILayout.BeginHorizontal();
		
		ReplacementItem = EditorGUILayout.ObjectField(ReplacementItem,GameObject);
// outputs "Assets/TileSwap.cs(28,80): error CS0119: Expression denotes a `type', where a `variable', `value' or `method group' was expected"
		EditorGUILayout.EndHorizontal();
		GUILayout.Label ("Base Settings", EditorStyles.boldLabel);
		SwapTag = EditorGUILayout.TextField ("Object Tag", SwapTag);
    //  DrawDefaultInspector(); //if you are just adding a button
		//Debug.Log
      if(GUILayout.Button ("Swap Tile")){
			replaceTiles = GameObject.FindGameObjectsWithTag(SwapTag);
			 foreach (GameObject replaceTile in replaceTiles) {
			Debug.Log(replaceTile.name);
				// Instantiate(ReplacementItem, replaceTile.transform.position, replaceTile.transform.rotation) as GameObject;
			//Instantiate(ReplacementItem,Test.transform.position, Test.transform.rotation) as GameObject;
			}
         //do what you need to here when the button is pressed

      }

   }
}
2

Fixed it myself

using UnityEngine;
using System.Collections;
using UnityEditor ;
//[ExecuteInEditMode]
//[CustomEditor(TileSwap)]

public class TileSwap : EditorWindow{
	
public string SwapTag ;
public Object ReplacementItem ; 
	public GameObject[] replaceTiles;
	
//public GameObject[] replaceTiles = GameObject.FindGameObjectsWithTag(SwapTag);
 public GameObject Test ; 


  public TileSwap _target;

    void OnEnable()    
    {
        _target = (TileSwap)_target;
    }
	
	[MenuItem("Window/TileSwaper")]
public static void ShowWindow()
	{
		//Show existing window instance. If one doesn't exist, make one.
		EditorWindow.GetWindow(typeof(TileSwap));
	}	

	
	
	void OnGUI()

   {
		
		 EditorGUILayout.BeginHorizontal();
	//GameObject TileNew = GameObject.FindGameObjectWithTag("SwapMe");	
		//ReplacementItem = EditorGUILayout.ObjectField(ReplacementItem,GameObject);
	ReplacementItem =	EditorGUILayout.ObjectField("New Tile", ReplacementItem, typeof(UnityEngine.Object));
		
// outputs "Assets/TileSwap.cs(28,80): error CS0119: Expression denotes a `type', where a `variable', `value' or `method group' was expected"
		SwapTag = EditorGUILayout.TextField ("Object Tag", SwapTag);
		EditorGUILayout.EndHorizontal();
		GUILayout.Label ("Base Settings", EditorStyles.boldLabel);
		
		
    	//SwapTag ="SwapMe";
		//  DrawDefaultInspector(); //if you are just adding a button
		//Debug.Log
      if(GUILayout.Button ("Swap Tile")){
			GameObject TileNew = GameObject.FindGameObjectWithTag("SwapMe");
			replaceTiles = GameObject.FindGameObjectsWithTag(SwapTag);
			 foreach (GameObject replaceTile in replaceTiles) {
			Debug.Log(replaceTile.name);
			Instantiate(ReplacementItem, replaceTile.transform.position, replaceTile.transform.rotation);
			//Instantiate(ReplacementItem,Test.transform.position, Test.transform.rotation) as GameObject;
			}
         //do what you need to here when the button is pressed

      }

   }
}
3

Final version for anyone who wants to use it
Gonna post this to the Wiki latter , has a delete replaced item option too .
Enjoy .

using UnityEngine;
using System.Collections;
using UnityEditor ;
//[ExecuteInEditMode]
//[CustomEditor(TileSwap)]

public class TileSwap : EditorWindow{
	
public string SwapTag ;
public Object ReplacementItem ; 
	public GameObject[] replaceTiles;
public bool myBool ;	
//public GameObject[] replaceTiles = GameObject.FindGameObjectsWithTag(SwapTag);
 public GameObject Test ; 


  public TileSwap _target;

    void OnEnable()    
    {
        _target = (TileSwap)_target;
    }
	
	[MenuItem("Window/TileSwaper")]
public static void ShowWindow()
	{
		//Show existing window instance. If one doesn't exist, make one.
		EditorWindow.GetWindow(typeof(TileSwap));
	}	

	
	
	void OnGUI()

   {
		
		 EditorGUILayout.BeginHorizontal();
	//GameObject TileNew = GameObject.FindGameObjectWithTag("SwapMe");	
		//ReplacementItem = EditorGUILayout.ObjectField(ReplacementItem,GameObject);
	ReplacementItem =	EditorGUILayout.ObjectField("New Tile", ReplacementItem, typeof(UnityEngine.Object));
		
// outputs "Assets/TileSwap.cs(28,80): error CS0119: Expression denotes a `type', where a `variable', `value' or `method group' was expected"
		SwapTag = EditorGUILayout.TextField ("Object Tag", SwapTag);
			myBool = EditorGUILayout.Toggle ("Delete Replaced Items", myBool);
		EditorGUILayout.EndHorizontal();
		GUILayout.Label ("Base Settings", EditorStyles.boldLabel);
		
	//	myBool = EditorGUILayout.Toggle ("Delete Replaced Items", myBool);
    	//SwapTag ="SwapMe";
		//  DrawDefaultInspector(); //if you are just adding a button
		//Debug.Log
      if(GUILayout.Button ("Swap Tile")){
			GameObject TileNew = GameObject.FindGameObjectWithTag("SwapMe");
			replaceTiles = GameObject.FindGameObjectsWithTag(SwapTag);
			 foreach (GameObject replaceTile in replaceTiles) {
			Debug.Log(replaceTile.name);
			Instantiate(ReplacementItem, replaceTile.transform.position, replaceTile.transform.rotation);
			
				if(myBool)
				{
					DestroyImmediate(replaceTile);
					//				Destroy(replaceTile);	
				}
					
				//Instantiate(ReplacementItem,Test.transform.position, Test.transform.rotation) as GameObject;
			}
         //do what you need to here when the button is pressed

      }

   }
}