title: Two tier expand and collapse in ios
body: <p>I have a task in which I need to implement two tier or two level expand-collapse functionality. For example if I clicking on a cell say C1, one more cell will be displayed say C2 and again if I click on C2, one more cell say C3 will be visible. Here clicking again on these cell will hide them respectively. I searched on google for this but didn't get anything so if you guys have any solution for this please help me.</p>
  
  <p>Thanks in advance.</p>