How to assign Page Layouts to particular user or profile dynamically by using Apex 

I have one  parent component and one child component. In parent component i have one tabel and in child component i have one pop up form. if press add button on above tabele then opens popup window after enter press submit button inside form then the values are display in table
here i want to pass values in sub component to parent componet and i used JSON for tabel 

How to assign Page Layouts to particular user or profile dynamically by using Apex