In my application I am using custom Navigation bar which loads from XIB,
As Iphone X has different Status Bar and Top Bar what are the changes need to make?
Or it will run normally?
Is status bar color is still relevant?
Also has changes for Tabbar?

If you were keeping navigation bar's height
64in old devices then foriPhone xyou can set that height to145as apple human interface guidelines said that it have145points of height for top bar!And yes status bar color will also relevant I think!
Edit
According to Geoff Hackworth's post
I think 140 is for large navigation bar titles in iOS 11 and iPhone x !
and for normal it should be
88