iOS 上滑隐藏导航,下滑显示导航,仿斗鱼导航效果

UItableView或 UIcollectionView 都是继承UIScrollView 滑动的时候,判断是上滑还是下滑 使用 UIScrollView 的代理方法

p.p1 { margin: 0.0px 0.0px 0.0px 0.0px; font: 11.0px Menlo; color: #000000 }
span.s1 { color: #ba2da2 }
span.s2 { }
span.s3 { color: #703daa }
func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>)

func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {
let pan = scrollView.panGestureRecognizer
let velocity = pan.velocity(in: scrollView).y

if velocity < -15 {
//上滑
self.navigationController?.setNavigationBarHidden(true, animated: true)
//状态栏颜色为黑色
UIApplication.shared.statusBarStyle = .default
NotificationCenter.default.post(name: NSNotification.Name(rawValue: kUpdateTitleFreamNote), object: nil)

} else if velocity > 15 {
//下滑
self.navigationController?.setNavigationBarHidden(false, animated: true)
//状态栏颜色为白色
UIApplication.shared.statusBarStyle = .lightContent
NotificationCenter.default.post(name: NSNotification.Name(rawValue: kInUpdateTitleFreamNote), object: nil)
}
}

　上滑时状态栏颜色为黑色,导航隐藏,下滑导航栏显示,状态栏变为白色

至于控件的布局需要根据状态去改变,