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スクロールでUINavigationBarを隠す

Last updated at Posted at 2018-05-28

NavigationBarだけならこれだけでシュッと表示・非表示してくれる。
動きも滑らかなので割と良さそう。

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    if scrollView.panGestureRecognizer.translation(in: scrollView).y < 0 {
        navigationController?.setNavigationBarHidden(true, animated: true)
    } else {
        navigationController?.setNavigationBarHidden(false, animated: true)
    }
}
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