ios - Can [self.window makeKeyAndVisible]; be called before setting rootviewcontroller -


my requirement uitabbarcontroller rootviewcontroller , on first time of app launch want show login procedure inside uinavcon, , displaying through presentviewcontroller.

i dont want uitabbarcontroller visible first time , dont want how login uinavcon popping modal.

i want make user experience if app starts first time login uinavcon should visible. here code:

- (bool)application:(uiapplication *)application didfinishlaunchingwithoptions:(nsdictionary *)launchoptions {  self.window = [[uiwindow alloc] initwithframe:[[uiscreen mainscreen] bounds]];   [self.window makekeyandvisible];//is correct call here?  loginvc *loginobj = [[loginvc alloc]init];  self.navigationcontroller = [[uinavigationcontroller alloc] initwithrootviewcontroller:cellphonenumber];  self.tabbarcontroller = [[uitabbarcontroller alloc]init];  self.window.rootviewcontroller = self.tabbarcontroller;  [self.tabbarcontroller presentviewcontroller:self.navigationcontroller animated:no completion:^{}];  return yes; }

i calling [self.window makekeyandvisible]; on second line right after uiwindow alloc init. correct or can experience problems viewcontroller not receiving events or orientations notifications?

you can call whenever want. calling affects window's z-index , screen property. doesnt depend on specific content being set.


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