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0

I am trying to run a block of code a certain amount of seconds after a 2D Collision. Currently, when the collision occurs it calls a function that loops over itself until a certain time is reached. The time is calculated using a time variable and adding Time.deltaTime each iteration.

This is the function

public void springBack(Collider2D collision, float timeCount) 
 if (timeCount > springReloadTime * 10) 
 Debug.Log("Springing Back!");

 timeCount = 0f;
 else 
 timeCount = timeCount + Time.deltaTime;

 springBack(collision, timeCount);
 

The issue occurs when I run this. Everything happens in one frame right after the collision instead of after a few seconds. If I could call the springBack(collision, timeCount); function on the next frame, this would work. When I looked it up, some people suggested using yield return null;, but since this isn't a loop it gives me this error here:

The body of 'playerMovement.springBack(Collider2D, float)' cannot be an iterator block because 'void' is not an iterator interface type

Is there another way to force it to run on the next frame? I could call it from the update() loop, but I think I can have multiple instances of this function running without it inferring with each other. If you need the values of some of the public variables (like springReloadTime), please ask.

c# unity3d

share|improve this question

edited Mar 21 at 21:58

Nashical

231

asked Mar 21 at 20:33

Jack StollerJack Stoller

478313

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can use yield only in coroutines (which is also what you want to use for this): docs.unity3d.com/Manual/Coroutines.html
  
  – UnholySheep
  Mar 21 at 20:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @UnholySheep, Thanks. I've replaced the void with IEnumerator and added the yield return null; before the springBack(collision, timeCount); line and it ran without error, and completion. Any ideas?
  
  – Jack Stoller
  Mar 21 at 21:04
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @JackStoller StartCoroutine(springBack()), springBack must return IEnumerator and inside this method implement your desired behaviour (it loks like you want to do it every n-th seconds, so you can do something like while(isLooping) springBack(); yield return new WaitForSeconds(time);. Be aware, that in that case you should store WaitForSeconds in property and then yield that property (var awaiter = new WaitForSeconds(n); .... while() yield return awaiter;). Using awaiter like this will not allocate memory everyTime, which is usefull especially in mobile development.
  
  – Pavel Pája Halbich
  Mar 21 at 21:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @PavelPájaHalbich Thanks! Could you post an answer?
  
  – Jack Stoller
  Mar 21 at 21:59
  

  
  
  
  

add a comment | 

0

I am trying to run a block of code a certain amount of seconds after a 2D Collision. Currently, when the collision occurs it calls a function that loops over itself until a certain time is reached. The time is calculated using a time variable and adding Time.deltaTime each iteration.

This is the function

public void springBack(Collider2D collision, float timeCount) 
 if (timeCount > springReloadTime * 10) 
 Debug.Log("Springing Back!");

 timeCount = 0f;
 else 
 timeCount = timeCount + Time.deltaTime;

 springBack(collision, timeCount);
 

The issue occurs when I run this. Everything happens in one frame right after the collision instead of after a few seconds. If I could call the springBack(collision, timeCount); function on the next frame, this would work. When I looked it up, some people suggested using yield return null;, but since this isn't a loop it gives me this error here:

The body of 'playerMovement.springBack(Collider2D, float)' cannot be an iterator block because 'void' is not an iterator interface type

Is there another way to force it to run on the next frame? I could call it from the update() loop, but I think I can have multiple instances of this function running without it inferring with each other. If you need the values of some of the public variables (like springReloadTime), please ask.

c# unity3d

share|improve this question

edited Mar 21 at 21:58

Nashical

231

asked Mar 21 at 20:33

Jack StollerJack Stoller

478313

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can use yield only in coroutines (which is also what you want to use for this): docs.unity3d.com/Manual/Coroutines.html
  
  – UnholySheep
  Mar 21 at 20:50
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @UnholySheep, Thanks. I've replaced the void with IEnumerator and added the yield return null; before the springBack(collision, timeCount); line and it ran without error, and completion. Any ideas?
  
  – Jack Stoller
  Mar 21 at 21:04
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  @JackStoller StartCoroutine(springBack()), springBack must return IEnumerator and inside this method implement your desired behaviour (it loks like you want to do it every n-th seconds, so you can do something like while(isLooping) springBack(); yield return new WaitForSeconds(time);. Be aware, that in that case you should store WaitForSeconds in property and then yield that property (var awaiter = new WaitForSeconds(n); .... while() yield return awaiter;). Using awaiter like this will not allocate memory everyTime, which is usefull especially in mobile development.
  
  – Pavel Pája Halbich
  Mar 21 at 21:33
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  @PavelPájaHalbich Thanks! Could you post an answer?
  
  – Jack Stoller
  Mar 21 at 21:59
  

  
  
  
  

add a comment | 

I am trying to run a block of code a certain amount of seconds after a 2D Collision. Currently, when the collision occurs it calls a function that loops over itself until a certain time is reached. The time is calculated using a time variable and adding Time.deltaTime each iteration.

This is the function

public void springBack(Collider2D collision, float timeCount) 
 if (timeCount > springReloadTime * 10) 
 Debug.Log("Springing Back!");

 timeCount = 0f;
 else 
 timeCount = timeCount + Time.deltaTime;

 springBack(collision, timeCount);
 

The issue occurs when I run this. Everything happens in one frame right after the collision instead of after a few seconds. If I could call the springBack(collision, timeCount); function on the next frame, this would work. When I looked it up, some people suggested using yield return null;, but since this isn't a loop it gives me this error here:

The body of 'playerMovement.springBack(Collider2D, float)' cannot be an iterator block because 'void' is not an iterator interface type

Is there another way to force it to run on the next frame? I could call it from the update() loop, but I think I can have multiple instances of this function running without it inferring with each other. If you need the values of some of the public variables (like springReloadTime), please ask.

c# unity3d

share|improve this question

edited Mar 21 at 21:58

Nashical

231

asked Mar 21 at 20:33

Jack StollerJack Stoller

478313

public void springBack(Collider2D collision, float timeCount) 
 if (timeCount > springReloadTime * 10) 
 Debug.Log("Springing Back!");

 timeCount = 0f;
 else 
 timeCount = timeCount + Time.deltaTime;

 springBack(collision, timeCount);
 

The body of 'playerMovement.springBack(Collider2D, float)' cannot be an iterator block because 'void' is not an iterator interface type

share|improve this question

edited Mar 21 at 21:58

Nashical

231

asked Mar 21 at 20:33

Jack StollerJack Stoller

478313

share|improve this question

edited Mar 21 at 21:58

Nashical

231

asked Mar 21 at 20:33

Jack StollerJack Stoller

478313

edited Mar 21 at 21:58

Nashical

231

edited Mar 21 at 21:58

Nashical

231

asked Mar 21 at 20:33

Jack StollerJack Stoller

478313

asked Mar 21 at 20:33

Jack StollerJack Stoller

478313