objective c - Warning - whose view is not in the window hierarchy in IOS 9 -

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i created 2 view controllers, viewcontrollerone , detailviewcontroller . , gave action uibutton, when button pressed go second view controller,

- (ibaction)loginbuttonpressed:(uibutton *)sender { self.loginbutton.hidden= yes; self.aview.backgroundcolor = [uicolor colorwithpatternimage:[uiimage imagenamed:@"authentication.png"]];  lacontext* context = [[lacontext alloc]init]; nserror* error = nil;  if ([context canevaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics error:&error]) {     [context evaluatepolicy:lapolicydeviceownerauthenticationwithbiometrics localizedreason:@"authenticate touch id" reply:^(bool success, nserror*error){         if (success) {             dispatch_async(dispatch_get_main_queue(), ^{                 self.loginbutton.hidden= no;                 self.aview.backgroundcolor = [uicolor clearcolor];                 detailviewcontroller* detailviewcontroller = [[detailviewcontroller alloc]init];               [self presentviewcontroller:detailviewcontroller animated:yes completion:nil];               });  }

but giving error,

<viewcontroller: 0x7f97e9da7d60> view not in window hierarchy!

when button pressed moves detailviewcontroller screen black, not showing details in detailviewcontroller.

if have added detailviewcontroller in storyboard, may have refer same storyboard while instantiating. 

uistoryboard *mainstoryboard = [uistoryboard storyboardwithname:@"your_storyboard_name" bundle: nil]; detailviewcontroller *detailviewcontroller = (detailviewcontroller*)[mainstoryboard instantiateviewcontrollerwithidentifier: @"your_storyboard_identifier"]; [self presentviewcontroller:detailviewcontroller animated:yes completion:nil];

when initiating using alloc/init, it's instantiating blank view controller.


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