样式设置失效及坐标微调问题

[jdleung]

✔️ Issue Checklist

• I have updated PopMenu to the latest version.
• I have read the Contribution Guidelines.
• I have read the Documentation.
• I have searched for GitHub issues.

✍🏻 Issue Description

因为弹出的菜单挡住了按钮，尝试改变y坐标作一个偏移
menu.contentFrame.origin.y -= 50

可以实现，但放在这行代码之后的样式设置就失效了，例如

menu.appearance.popMenuCornerRadius = 2
menu.appearance.popMenuColor.backgroundColor = .solid(fill: .purple)

通过测试menu.contentFrame.origin.y -= 50必须放在样式设置之后。

请问还有更好的办法来微调菜单的位置吗？谢谢

💻 Environment

• iOS Version: [13.3]
• Xcode Version: [11.3.1]
• Device(s): [iPhone 11]
• Simulator?: ☑️