Question How to pause for coroutine?

I have a class that iterates over functions to move an object, I need to pause when colliding with an object and continue the coroutine from the same place when pressing the button.

Code (CSharp):

1. public class MainLoop
2. {
3.     GameObject mainTarget;
4.     List<Function_> sequence_;
5.     public bool infiniteLoop;
6.     public bool end;
7.     private float waitTime;
8.     private int step;
9.     public bool paused=false;
10.  
11.     public MainLoop(GameObject mainTarget, List<Function_> sequence_)
12.     {
13.         this.end = false;
14.         this.mainTarget = mainTarget;
15.         this.sequence_ = sequence_;
16.         this.waitTime = 1.2f;//wait time between functions in sequence (list)
17.     }
18.     public IEnumerator Play()
19.     {
20.  
21.         WaitForSeconds wait = new WaitForSeconds(waitTime);
22.         this.end = false;
23.         foreach (Function_ fun in this.sequence_)
24.         {
25.             fun.Func(this.mainTarget);
26.  
27.             if (!paused)
28.             {
29.                 yield return wait;
30.             }
31.         }
32.         this.end = true;
33.     }
34.  
35.  
36. }

 

Code (CSharp):

1. while (paused) {
2.     yield return null;
3. }

Yield return null will reschedule the coroutine the next frame. (source)