如何使UisheetPresentationController Prefersgrabbervisible遵循光/暗模式？
在设置uisheetPresentationController's prefersgrabbervisible to true中，我们的应用程序成功地显示了Modal View Controller的顶部的Grabber句柄。
但是，Grabber始终处于系统灯/暗模式，忽略了OverrideUserInterFaceStyle设置，而忽略了uitraitCollection覆盖。
我们如何使Grabber尊重特定的视图控制器的光/深色UIUSERINTERFACESTYLE，而不仅仅是粘附在设备灯/暗模式上？
In setting UISheetPresentationController's prefersGrabberVisible to true, our app successfully displays the grabber handle at the top of modal view controllers.
However, the grabber is always in the system light/dark mode, ignoring the overrideUserInterfaceStyle setting and ignoring the UITraitCollection override.
How do we make the grabber respect the specific view controller's light/dark UIUserInterfaceStyle instead of just adhering to device light/dark mode?
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OverrideUserInterfaceStylegrabber的视图所覆盖，这就是为什么将此属性设置为视图控制器（或Supperiew）无济于事的原因。因此，您无法控制Grabber的颜色。
但是，如果您真的想更改它，则可以尝试在每次
traitcollectiondidchange（...）中尝试在子视图中手动查找它的颜色。overrideUserInterfaceStylefor the grabber is overrided by its view that's why setting this property to a view controller (or superview) doesn't help.Therefore, you can't control the color of the grabber.
However, if you really want to change it, you can try to change color of the grabber manually finding it in subviews each time
traitCollectionDidChange(...)is called