(Already asked on StackOverflow, but might as well cover my bases here as well.)
I have a view controller navigation hierarchy where only the top view
controller has its navigation bar hidden. Normal pushing/popping is fine and
works as expected. However, when the pop is interactive (drag-to-pop), the top
opaque bar doesn't disappear until the transition is finished. I've implemented
the logic in the following delegate call:
- (void)navigationController:(UINavigationController *)navigationController
willShowViewController:(UIViewController *)viewController
animated:(BOOL)animated {
if( [viewController isKindOfClass:[MyTopViewController class]] == YES ) {
id<UIViewControllerTransitionCoordinator> transitionCoordinator =
viewController.transitionCoordinator;
if( transitionCoordinator != nil &&
transitionCoordinator.initiallyInteractive == YES ) {
[transitionCoordinator
notifyWhenInteractionEndsUsingBlock:^(id<UIViewControllerTransitionCoordinatorContext>
_Nonnull context) {
if( context.isCancelled == YES ) {
return;
}
[navigationController setNavigationBarHidden:YES
animated:animated];
}];
} else {
[navigationController setNavigationBarHidden:YES animated:animated];
}
} else {
[navigationController setNavigationBarHidden:NO animated:animated];
}
}
I've already attempted numerous variations of this, but each one has had
various issues with interactive transitions, especially if the transition is
canceled mid-way. What's the best way to approach this?
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