Ios PresentViewController仅工作一次

我在这里有点眼花缭乱。我确实认为这可能是件愚蠢的事情，但事情是这样的

我使用ABPadLockScreen设置密码，当我第一次打开应用程序时，如果应用程序关闭（终止）并重新打开，它工作正常，但如果我只是回家并返回，我会收到以下警告

Warning: Attempt to present <ABPadLockScreenViewController: 0x7fdc70f1d5a0> on <ViewController: 0x7fdc70f18e00> whose view is not in the window hierarchy!

如果您想知道代理的情况，那么当应用程序简单地关闭并重新打开时，密码屏幕就会显示出来，此时会出现警告

而且，如果我只是从一个视图切换到另一个视图，那该死的东西就会再次出现

提前谢谢

AppDelegate *delegate = (AppDelegate*)[[UIApplication sharedApplication] delegate];

if (!self.pin && delegate.terminated) {
    //        [[[UIAlertView alloc] initWithTitle:@"No Pin" message:@"Please Set a pin before trying to unlock" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil] show];
    //return;
    [self dismissViewControllerAnimated:YES completion:nil];
} else if (!self.isPin && !delegate.terminated) {

    ABPadLockScreenViewController *lockScreen = [[ABPadLockScreenViewController alloc] initWithDelegate:self complexPin:YES];
    [lockScreen setAllowedAttempts:3];

    lockScreen.modalPresentationStyle = UIModalPresentationFullScreen;
    lockScreen.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;

    [self presentViewController:lockScreen animated:YES completion:nil];
}