ios - Navigation working very slow -

on working navigation based application performing 3-4 push. when pop 4 controller view , on takes time 2 sec delay. performing background operations storing images in file manager when press button previous view nav bar gets clicked because of slow navigation. unable understand problem delay.

thanks in advance.

try write code push on main thread,

i.e.

dispatch_async(dispatch_get_main_queue(), ^(){      [self.navigationcontroller pushviewcontroller:yourviewcontroller]; });