如何向下滚动隐藏导航栏和工具栏？ Swift（喜欢myBridge应用程序） [英] How to hide the navigation bar and toolbar as scroll down? Swift (like myBridge app)

问题描述

我想在向下滚动页面时隐藏工具栏和导航栏。当我向上滚动时返回它。这怎么可能？

I want to hide a toolbar and nav bar as I scroll down a page. And return it as I scroll up. How is this possible?

我如何检测阻力？我是否使用平移手势或是滚动视图？

How would I go about detecting the drag? Do I use pan gesture or is this down with the scrollview?

推荐答案

尝试这种简单方法：在 Swift 3

Try this simple approach: Tested in Swift 3

    func scrollViewWillEndDragging(_ scrollView: UIScrollView, withVelocity velocity: CGPoint, targetContentOffset: UnsafeMutablePointer<CGPoint>) {

    if(velocity.y>0) {
        //Code will work without the animation block.I am using animation block incase if you want to set any delay to it.
        UIView.animate(withDuration: 2.5, delay: 0, options: UIViewAnimationOptions(), animations: { 
            self.navigationController?.setNavigationBarHidden(true, animated: true) 
            self.navigationController?.setToolbarHidden(true, animated: true)
            print("Hide")
        }, completion: nil)

    } else {
        UIView.animate(withDuration: 2.5, delay: 0, options: UIViewAnimationOptions(), animations: { 
            self.navigationController?.setNavigationBarHidden(false, animated: true)
            self.navigationController?.setToolbarHidden(false, animated: true)
            print("Unhide")
        }, completion: nil)    
      }
   }

输出： 已更新

注意：如果您将此VC中的任何数据传递到另一个嵌入了 navigationController 的VC。您可能需要取消隐藏 NavigationBar 。

Note: If you passing any data from this VC to another VC that embedded with navigationController.You may need to unhide the NavigationBar.

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