在 iOS 中旋转时 inputAccessoryView 的 UIToolbar 变黑

Question

这是我的代码：

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.

    let keyBoardToolBar = UIToolbar(frame: CGRectMake(0, 0, self.view.frame.size.width, 44))
    keyBoardToolBar.barStyle = .Default

    let flexSpaceKeyboardBarButtonItem = UIBarButtonItem(barButtonSystemItem: .FlexibleSpace, target: nil, action: nil)

    let doneKeyboardBarButtonItem = UIBarButtonItem(title: "Done", style: .Done, target: self, action: nil)

    let wordKeyboardBarButtonItem = UIBarButtonItem(title: "Button 1", style: .Plain, target: self, action: nil)

    var barItems: [UIBarButtonItem] = []
    barItems.append(wordKeyboardBarButtonItem)
    barItems.append(flexSpaceKeyboardBarButtonItem)
    barItems.append(doneKeyboardBarButtonItem)

    keyBoardToolBar.setItems(barItems, animated: true)

    self.myTV.inputAccessoryView = keyBoardToolBar
}

当我转动设备时，UIToolBar 变黑：（点击再次查看此 GIF）

那么有什么办法可以解决吗？谢谢！

顺便说一句：在模拟器中我看不到 UIToolBar 变黑。

Answer 1

通过添加修复：（但仍不清楚导致它的原因）

keyBoardToolBar.isTranslucent = false
keyBoardToolBar.barTintColor = UIColor(colorLiteralRed: (247/255), green: (247/255), blue: (247/255), alpha: 1)

（UIColor(colorLiteralRed: (247/255), green: (247/255), blue: (247/255), alpha: 1)是here中UIToolBar的默认背景色）