ios - Data is persistent in one table view, but not when switching between other view controllers -

i'm looking implement contacts list app. have add contact working , actively uses nscoding writing disk contacts. update between list of contacts , new contact view, doesn't when switch view.

do need prepareforsegue when coming non-contact views in way prepares data? or need create set<contacts> in first view , pass references through when going between views. of updates data when unwindsegue add contact view controller.

i need more context (code) sure solve case.

but had similar issues in past 1 simple reason:

i put refresh code in viewdidload(). called when viewcontroller loaded (first time appears), not every time switch (doesn't reload it).

you should put code in viewdidappear(), or viewwillappear() if want executed each time "switch" view.

here code:

viewdidappear(){  code code  code refreshes view contacts  } 

here should be:

viewdidload() {  code  code }  viewdidappear() { code refreshes view contacts } 

code want executed each time view appears on screen should put in "viewdidappear()".