Ienumerator wait for event

I'm making a tutorial system.

This is how it works.

• i have a class named TutorialSegmentData

• in TutorialController i loop TutorialSegmentDatas

• in every loop i use yield return new WaitForSeconds(tutorialSegmentData.waitingTime)

but now what i want to do is waitig until user's action. For example, i add callback to buttonClick event and in every loop, it should wait for user to press that button. (its more complicated than button actually.)

any solutions for this? ps. i would like to avoid using WaitUntil and turning boolean to true when the button is clicked.