ios - Update bottom view of uipagecollectionview's parent page -

i have uiviewcontroller abc, uipageviewcontroller pqr, uiviewcontroller xyz

abc has pqr loads xyz,

now abc has footer has reflected on click of button in xyz.

see screenshot in here

here order buttons in xyz, , bottom red color bar in pqr how can reflect values there.

i hope clear question, let me know doubts explain again

there number of ways can pass information xyz class pqr class. keep reference pqr in xyz, when button pressed can report action pqr.

you can make use of various methods of passing information between classes indirectly. take @ answer , other answer on this question examples.