Countdown timer resets when clicked "Launch" button

Hi guys,

I'm getting this problem, I wrote the code below and what he should do is to apply a force until it finishes a countdown that if I put 5 sec (just to not stay long) and also put a button on the GUI called "Launch". So far I think I made the correct logic, however when I put this script in a cube, and click on "Launch" the timer changes from 5 to 0 without counting backwards, what I want is to continue applying pressure until the time runs out .

Can anyone tell me what I'm doing wrong?

Code (CSharp):

1. using UnityEngine;
2. using System.Collections;
3.  
4. public class Launcher : MonoBehaviour {
5.  
6.     public float timer;
7.  
8.     void OnGUI()
9.     {
10.         if(GUI.Button (new Rect (10, 10, 100, 90), "LAUNCH"))
11.         {
12.             Launch();
13.         }
14.     }
15.  
16.     void Launch()
17.     {
18.         while(timer > 0)
19.         {
20.                 rigidbody.AddForce (Vector3.up * 5);
21.                 timer = timer - Time.deltaTime;
22.         }
23.         Debug.Log ("Game Over");
24.     }
25.  
26.     void Update()
27.     {
28.  
29.     }
30. }

 

Launch should be a coroutine and yield.

 

Cool, but how'll implement this?

 

The word "coroutine" in my post was a link to a tutorial: http://unity3d.com/learn/tutorials/modules/intermediate/scripting/coroutines

 

Out sorry, I'll see this

 

The while loop is executed in 1 frame. So it runs the code until timer is 0 and then go to the next frame. you can use a if statement for this: if(timer > 0)

If this helped you please mark as solution or +1

 

I tried it with "if (timer> 0)" but time and force can only be applied if I hold clicked button release. All I want is when I click the button once the timer starts counting down and the force is applied until the time runs out.

 

you need to do a coroutine like this:

Code (CSharp):

1. IEnumerator CountDown (float delay) {
2.         while (timer > 0) {
3.             //ADD FORCE
4.             timer -= Time.deltaTime;
5.            
6.             yield return new WaitForSeconds (delay);
7.         }
8.     }
9.  

then when your button is pressed call it by:

Code (CSharp):

1. StartCoroutine (CountDown (1.0f));

 

I havent't tested it so there could be a error, but hopefully you get the gist of things

 

That's exactly what I wanted, thank you!