QLPreviewController隐藏底部工具栏 [英] QLPreviewController hide bottom toolbar

问题描述

我在我的应用程序中使用 QLPreviewController 并想要隐藏底部工具栏，它允许移动它的数据源项目。有可能以某种方式吗？

I use QLPreviewController in my app and want to hide bottom toolbar which allows to move through it's datasource items. Is it possible to do somehow?

我试图将其作为子视图搜索 QLPreviewController的视图但它只有一个 _UISizeTrackingView 类的子视图。据我所知，这是一个私人课程，所以我没有权利寻找那里的东西。

I tried to search it as a subview of QLPreviewController's view but it has only one subview of _UISizeTrackingView class . As i understand it's a private class so i have no rights to look for something there.

有没有办法隐藏这个工具栏，Apple是否允许这样做？谢谢。

Are there any ways to hide this toolbar and does Apple allow to make that? Thank you.

推荐答案

QLPreviewViewController 里面可以有1个以上的工具栏。这就是为什么你需要在子视图中找到所有 UIToolbar 并隐藏它们。

QLPreviewViewController can have more than 1 toolbar inside. That's why you need to find all UIToolbar in subviews and hide them.

此外，您需要观察隐藏属性的更改，因为当用户点击 QLPreviewViewController 它改变工具栏和导航栏的可见性。

Also you need observe change of hidden property because when user tap in QLPreviewViewController it change visibility of toolbars and navigation bars.

Swift 3：

var toolbars: [UIToolbar] = []

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)
    toolbars = findToolbarsInSubviews(forView: view)
    for toolbar in toolbars {
        toolbar.isHidden = true
        toolbar.addObserver(self, forKeyPath: "hidden", options: .new, context: nil)
    }
}

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    for toolbar in toolbars {
        toolbar.removeObserver(self, forKeyPath: "hidden")
    }
}

private func findToolbarsInSubviews(forView view: UIView) -> [UIToolbar] {
    var toolbars: [UIToolbar] = []
    for subview in view.subviews {
        if subview is UIToolbar {
            toolbars.append(subview as! UIToolbar)
        }
        toolbars.append(contentsOf: findToolbarsInSubviews(forView: subview))
    }
    return toolbars
}

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    if let keyPath = keyPath,
        let toolbar = object as? UIToolbar,
        let value = change?[.newKey] as? Bool,
        keyPath == "hidden" && value == false {
        toolbar.isHidden = true
    }
}

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