有没有办法更改使用 UIPopoverViewController 加载的弹出视图的背景和默认框架？
（1）尝试更改弹出框背景的框架颜色但没有发生...有什么方法可以更改它吗？
(2) 尝试删除弹出窗口的子层并替换为其他层，这能够删除默认框架，但应用程序在关闭弹出窗口时崩溃。
(3) 有没有办法隐藏图层并将背景颜色更改为clearColor？layer.hidden=yes; 不起作用。
layer.backgroundColor = [[UIColor clearColor] CGColor]
// is not working but its working for other colors like blueColor
(1) Trying change the frame color of popover Background but its not happening... Is there any way to change it?
(2) Have tried removing the sublayer of popover and replacing with other layer with this was able to remove the default frame but the application crashes while dissmising the popover.
(3) Is there any way to hide a layer and changing background color to clearColor?layer.hidden=yes; is not working.
layer.backgroundColor = [[UIColor clearColor] CGColor]
// is not working but its working for other colors like blueColor
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