問題描述

我對 iOS 開發很陌生.現在，當我向下滾動和向上滾動時，我正試圖隱藏我的標簽欄.我想讓這個動畫像導航欄一樣.對于導航欄，我只需單擊 Attributes Inspector 中的選項.我看到了一些工具欄的例子，但我不能采用它作為標簽欄.

I'm quite new to iOS development. Right now i'm trying to hide my tabbar when I scroll down and when scrolling up the tabbar should appear. I would like to have this animated in the same way like the navigation bar. For the navigation bar I simply clicked the option in the Attributes Inspector. I saw some examples for the toolbar, but I cant adopt it the tabbar.

self.tabBarController?.tabBar.hidden = true 只是隱藏了我的標簽欄，但它不像導航控制器那樣具有動畫效果.

self.tabBarController?.tabBar.hidden = true just hides my tabbar, but its not animated like the navigation controller.

推薦答案

這是我在生產應用程序中實際使用的代碼.

This is code that i'm actually using in a production app.

它在 Swift 中，它還更新 UITabBar.hidden var.

It's in Swift and it also updates UITabBar.hidden var.

func scrollViewWillBeginDragging(scrollView: UIScrollView) {
    if scrollView.panGestureRecognizer.translation(in: scrollView).y < 0{
        changeTabBar(hidden: true, animated: true)
    }
    else{
        changeTabBar(hidden: false, animated: true)
    }
}

你也可以使用其他回調方法:

You can also use the other callback method:

func scrollViewDidScroll(scrollView: UIScrollView) {
    ...
}

但如果您選擇這樣做，那么您必須處理對實際隱藏 tabBar 的輔助方法的多次調用.

but if you choose so, then you must handle multiple calls to the helper method that actually hides the tabBar.

然后你需要添加這個方法來動畫 tabBar 的隱藏/顯示.

And then you need to add this method that animates the hide/show of the tabBar.

func changeTabBar(hidden:Bool, animated: Bool){
    var tabBar = self.tabBarController?.tabBar
    if tabBar!.hidden == hidden{ return }
    let frame = tabBar?.frame
    let offset = (hidden ? (frame?.size.height)! : -(frame?.size.height)!)
    let duration:NSTimeInterval = (animated ? 0.5 : 0.0)
    tabBar?.hidden = false
    if frame != nil
    {
        UIView.animateWithDuration(duration,
            animations: {tabBar!.frame = CGRectOffset(frame!, 0, offset)},
            completion: {
                println($0)
                if $0 {tabBar?.hidden = hidden}
        })
    }
}

更新 Swift 4

func changeTabBar(hidden:Bool, animated: Bool){
    guard let tabBar = self.tabBarController?.tabBar else { return; }
    if tabBar.isHidden == hidden{ return }
    let frame = tabBar.frame
    let offset = hidden ? frame.size.height : -frame.size.height
    let duration:TimeInterval = (animated ? 0.5 : 0.0)
    tabBar.isHidden = false

    UIView.animate(withDuration: duration, animations: {
        tabBar.frame = frame.offsetBy(dx: 0, dy: offset)
    }, completion: { (true) in
        tabBar.isHidden = hidden
    })
}

這篇關于iOS/Swift - 向下/向上滾動時隱藏/顯示 UITabBarController的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！