在QLPreviewController上放置白色工具栏看起来是灰色 [英] Laying white toolbar over QLPreviewController toolbar is looking gray

问题描述

我偶然发现了关于添加/删除qlpreviewcontroller的uibarbuttonitems的SO讨论.但是，他们正在删除导航栏，并在其上方叠加了一个新的导航栏.

I stumbled upon this SO discussion on adding/removing qlpreviewcontroller's uibarbuttonitems. However they were removing the navigation bar and overlaying a new one on top of it.

我之所以要更改工具栏，主要是因为QLPreviewController附带的工具栏是黑色的，而应用程序中其余的工具栏是白色的.

I was looking to change the toolbar primarily because the toolbar that comes with QLPreviewController is black and the rest of the toolbars in my application are white.

我有适当的代码来覆盖条形图，但是当我将工具栏的颜色设置为白色时，它实际上变成了浅灰色.我以为这是因为工具栏不是不透明的，但是将alpha设置为1.0后，它仍然看起来一样.

I have code in place to get the bar overlaying but it seems that when I set the toolbar tint color to white, its actually becoming a light gray. I was thinking that this was because the toolbar was not opaque but after setting alpha to 1.0 it still looks the same.

扩展了QLPreviewController的类中的相关工具栏代码

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(animated)

    ....

    self.overlayToolBar?.setItems([actionBtn], animated: false)
    self.overlayToolBar?.tintColor = .blue
    self.overlayToolBar?.barTintColor = .white
}

上一屏幕上的工具栏

QLPreviewController屏幕上的工具栏

QLPreviewController的原始工具栏

是否有其他/更好的方法来设置工具栏颜色?由于QuickLook在XPC中运行，因此我无法直接编辑工具栏.因此，我必须绕过 hack 来在屏幕上获得自定义的工具栏.

Is there a different/better way to set the toolbar color? Since QuickLook runs through XPC I can't edit the toolbar directly. Thus I have to do this roundabout hack to get a customized toolbar on the screen.

推荐答案

当我尝试不显示QLPreviewController上的所有项目时，我遇到了类似的问题.

I ran into a similar issue when I was attempting to not show all of the items on a QLPreviewController.

我最终继承了QLPreviewController的子类:

I ended up subclassing the QLPreviewController:

import QuickLook

class PreviewController: QLPreviewController {

    override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)

        navigationItem.leftBarButtonItems = nil
    }

}

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