tabBarを非表示・表示する実装

非表示にしたい時
- (void)hideTabBar:(BOOL)animated {
UITabBar *tabBar = self.tabBarController.tabBar;
UIView *parent = tabBar.superview; // UILayoutContainerView
UIView *content = [parent.subviews objectAtIndex:0]; // UITransitionView

NSTimeInterval duration = animated ? 0.1 : 0.001;
[UIView animateWithDuration:duration animations:^{
CGRect tabFrame = tabBar.frame;
tabFrame.origin.y = [UIScreen mainScreen].bounds.size.height;
CGRect contentFrame = [UIScreen mainScreen].bounds;
tabBar.frame = tabFrame;
content.frame = contentFrame;
}];
}

再び表示させたい時
- (void)showTabBar:(BOOL)animated {
UITabBar *tabBar = self.tabBarController.tabBar;
UIView *parent = tabBar.superview; // UILayoutContainerView
UIView *content = [parent.subviews objectAtIndex:0]; // UITransitionView

NSTimeInterval duration = animated ? 0.001 : 0.001;
[UIView animateWithDuration:duration animations:^{
CGRect tabFrame = tabBar.frame;
tabFrame.origin.y = [UIScreen mainScreen].bounds.size.height - CGRectGetHeight(tabBar.frame);
CGRect contentFrame = content.frame;
contentFrame.size.height -= tabFrame.size.height;
tabBar.frame = tabFrame;
content.frame = contentFrame;
}];
}