Moving a set of pictures in an array in two directions

I'm trying to move some pictures in an array forward with one UI Button then reverse with another button.I have it working somewhat, but when I reverse the numbers don't work right...if going forward to the last one..if its the number 4 in the array...hitting the reverse button , should bring up picture number 4...instead it starts with 1,then 0, then -0..here's my script

Code (CSharp):

1.  
2. // cycle pictures forward and reverse
3. // using Unity 4.6
4.  
5. using UnityEngine;
6. using System.Collections;
7. using UnityEngine.UI;
8.  
9. public class Back_Forth : MonoBehaviour
10. {
11.  
12.     public Sprite[] fish;
13.     //public TextAsset[] myAssets;
14.     public static int FWcount = 0;
15.     public Image FishImage;
16.     public Button forward;
17.     public Button back;
18.     //public Text myText;
19.  
20.     void Start ()
21.     {
22.         FishImage.sprite= fish[FWcount];
23.         //myText.text=""+myAssets[FWcount];
24.     }
25.    
26.     public void ForwardFish ()
27.     {
28.         if(forward)
29.         {
30.             FWcount  = FWcount +1;
31.             FishImage.sprite= fish[FWcount];
32.             //myText.text=""+myAssets[FWcount];
33.             if(FWcount>=2)
34.             {   FWcount = 2;  }
35.  
36.         }
37.     }
38.  
39.     public void BackFish ()
40.     {
41.         if(back && FWcount>=0)
42.         {
43.             FishImage.sprite= fish[FWcount];
44.             //myText.text=""+myAssets[FWcount];
45.             FWcount  = FWcount -1;
46.             if(FWcount<0)
47.             {   FWcount = 0;  }
48.         }
49.     }
50.    
51. }
52.  

 

You need to set the sprite after you calculate the number. Change it to:

Code (csharp):

1.  
2. public void ForwardFish ()
3.     {
4.         if(forward)
5.         {
6.             FWcount  = FWcount +1;
7.             //myText.text=""+myAssets[FWcount];
8.             if(FWcount>=2)
9.             {   FWcount = 2;  }
10.              FishImage.sprite= fish[FWcount];
11.         }
12.     }
13.  
14.     public void BackFish ()
15.     {
16.         if(back && FWcount>=0)
17.         {
18.             //myText.text=""+myAssets[FWcount];
19.             FWcount  = FWcount -1;
20.             if(FWcount<0)
21.             {   FWcount = 0;  }
22.             FishImage.sprite= fish[FWcount];
23.         }
24.     }

 

Thanks a lot..I guess order is everything