Shop System

Hello,
I'm currently working on a 2D game and would like to do a shop system. I would like to withdraw 15 coins when I press a button, but I have no idea how to do it.
This is the script from the coin system
(I don't know if you need this to help me):

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5.  
6. public class Points : MonoBehaviour
7. {
8.     public Text scoreText;
9.     public float scoreAmount;
10.     public float pointIncreasedPerSecond;
11.  
12.     void Start()
13.     {
14.         scoreAmount = 0f;
15.         pointIncreasedPerSecond = 0.5f;
16.     }
17.  
18.     void Update()
19.     {
20.         scoreText.text = "" + (int)scoreAmount;
21.         scoreAmount += pointIncreasedPerSecond * Time.deltaTime;
22.  
23.         if (scoreAmount > PlayerPrefs.GetInt("Highscore"))
24.         {
25.             PlayerPrefs.SetInt("Highscore", (int)scoreAmount);
26.         }
27.     }
28. }

 

Have you worked with UI buttons before? Create a public function called ShopWithdraw or something and have it check if scoreAmount is >= 15. If it is, then have scoreAmount -= 15. Click on the UI button you make and go to the events and add an OnClick event, drag in the script with the ShopWithdraw function and select the function. Then when you click it, it will perform that function.

Now, im guessing the player has an inventory so you want that 15 to go to the Player. Its pretty similar but you add instead of reverse. Ill leave that part up to you but if you get close and post your code, i may help again.

 

Okay, I've now put it in a new script and tried the normal one, but no function is displayed for the button.
Did I make a mistake in the script and which one should I use, the new one or the old one with the one added?

Here is the old script with the new code:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4. using UnityEngine.UI;
5.  
6. public class Points : MonoBehaviour
7. {
8.     public Text scoreText;
9.     public float scoreAmount;
10.     public float pointIncreasedPerSecond;
11.     public float ShopWithDraw;
12.  
13.     void Start()
14.     {
15.         scoreAmount = 0f;
16.         pointIncreasedPerSecond = 0.5f;
17.     }
18.  
19.     void Update()
20.     {
21.         if (scoreAmount >= 15)
22.         {
23.             scoreAmount -= 15;
24.         }
25.         scoreText.text = "" + (int)scoreAmount;
26.         scoreAmount += pointIncreasedPerSecond * Time.deltaTime;
27.  
28.         if (scoreAmount > PlayerPrefs.GetInt("Highscore"))
29.         {
30.             PlayerPrefs.SetInt("Highscore", (int)scoreAmount);
31.         }
32.     }
33. }

And here the new one:

Code (CSharp):

1. using System.Collections;
2. using System.Collections.Generic;
3. using UnityEngine;
4.  
5. public class GivePoints : MonoBehaviour
6. {
7.     public float scoreAmount;
8.     public float ShopWithDraw;
9.     void Start()
10.     {
11.        
12.     }
13.  
14.  
15.     void Update()
16.     {
17.        if(scoreAmount >= 15)
18.         {
19.             scoreAmount -= 15;
20.         }
21.     }
22. }

 

So you need to make a brand new function, not just an If condition within Update or Start.

Something like this:

Code (CSharp):

1. public void WithdrawCurrency()
2. {
3.     if(scoreAmount >= withdrawAmount)
4.     {
5.         scoreAmount -= withdrawAmount;
6.     }
7. }

Make sure you declare that function outside of Start, or Update or any other function. It should be outside of the { } of Start or Update but within the { } of the Class. Basically, Start and Update are functions so you need to create your own.

Once you save and exit, then you should be able to see that function in the event trigger on the UI button.

 

Yeah, thats works!
Thanks!

 

Hello again, so now I have the script running, I wanted to ask if you can help me with one more thing, because I would like, if you buy something, you bring a prefab into the scene in the script. Do you think, you can help me?

 

I have already tested whether it would work in the previous script and yes it does!

 

Just use the Instantiate method to bring Prefabs into the scene.

 

Do you know how to use this?

 

Yes. but you need to get better at Googling things. Just look up "How to instantiate gameobjects in unity" and you will find plenty.