(Xcode / Swift) 向下滚动 UIWebView 时如何隐藏工具栏？
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(Xcode / Swift) How to hide toolbar when scrolling down UIWebView?
提问by user3796209
I have a UIWebViewin my ViewControllerand a navigation controller embedded in my ViewController. In my navigation controller, I selected "Show Toolbar"and "Hide Bars on Swipe"but the Toolbar doesn't hide. It only works when "Show Navigation Bar"is selected with the Toolbar.
我有一个UIWebView在我的ViewController并嵌入我的导航控制器的ViewController。在我的导航控制器中，我选择了“显示工具栏”和“滑动时隐藏栏”，但工具栏没有隐藏。它仅在使用工具栏选择“显示导航栏”时有效。
Is there anyway to have the Toolbarhide on swipe when scrolling down the UIWebView?
无论如何，在向下滚动UIWebView时是否可以在滑动时隐藏工具栏？
Thank you in advanced.
先谢谢了。
回答by Dharmesh Kheni
You can use UIScrollViewDelegatefor that.
你可以用UIScrollViewDelegate它。
Here is example code for hide navigation bar and tool bar with scroll:
以下是带有滚动的隐藏导航栏和工具栏的示例代码：
import UIKit
class ViewController: UIViewController, UIScrollViewDelegate {
@IBOutlet weak var toolBar: UIToolbar!
@IBOutlet weak var webV: UIWebView!
var lastOffsetY :CGFloat = 0
override func viewDidLoad() {
super.viewDidLoad()
webV.scrollView.delegate = self
let url = "http://apple.com"
let requestURL = NSURL(string:url)
let request = NSURLRequest(URL: requestURL!)
webV.loadRequest(request)
}
//Delegate Methods
func scrollViewWillBeginDragging(scrollView: UIScrollView){
lastOffsetY = scrollView.contentOffset.y
}
func scrollViewWillBeginDecelerating(scrollView: UIScrollView){
let hide = scrollView.contentOffset.y > self.lastOffsetY
self.navigationController?.setNavigationBarHidden(hide, animated: true)
toolBar.hidden = hide
}
}
