Arrange UIView with respect to external UIViews

Question

How do I organize (in terms of depth) a view in a view of a view in front of another view?

The hierarchy is as follows:

A--
   -C
   -D
B--
   -E
   -F

(A and B are species with C and D, and E and F are respectively).

B is superimposed over A, therefore, each similarity in B (E and F) is located above each subzone in (C and D). How can I make the mapping C above everything in B, but the rest remains as it should be?

In other words, how can I make the order of the displayed views (the first in the list the highest and the next after it):

C
B
E & F (same level)
A
D

Thank you Arseny

Answer 1

, . A B , C B, A D , C A , A .

Answer 2

UIView / ?

insertSubview:aboveSubview:
insertSubview:atIndex:
insertSubview:belowSubview:
addSubViews:
bringSubviewToFront:
removeFromSuperview:

Answer 3

, C B, B.

Answer 4

C A B. , .

C
  -B
    -E
    -F
  -A
    -D

, .

Answer 5

A B UIViewControllers? C, D, E, F UIViews ? .

UIViewController, . .