ios - How to tell if it's your first run? -

i wonder how can check whether it's first run of ios app, in order start specific view. saw many ways objective-c, not how implement in xamarin.

i'm not familiar xamarin, sounds easy checking existence of custom entry, launchedbefore, in nsuserdefaults @ app launch , writing if not found.

something like

public override void finishedlaunching (uiapplication application) {     var defaults = nsuserdefaults.standarduserdefaults;     const string key = "launchedbeforekey";     if (!defaults.boolforkey(key)) {         // first launch         user.setbool(true, key);         defaults.synchronize();          // stuff specific first launch here...     }      //... } 

i'm using "launchedbefore" opposed "firstlaunch" since boolforkey() return false in case key doesn't exist, it's semantically better way.