是否可以设置偏移，因为我不想PopMenu挡住Button的位置：UIBarButtonItem

[China77]

✔️ Issue Checklist

• [ ] I have updated PopMenu to the latest version. lastest version 2.0+
• [ ] I have read the Contribution Guidelines.
• [ ] I have read the Documentation.
• [ ] I have searched for GitHub issues.

✍🏻 Issue Description

💻 Environment

• iOS Version: [iOS VERSION] IOS 11 Swift 4.2
• Xcode Version: [XCODE VERSION] XCode 10.1
• Device(s): [INSERT DEVICE(S) HERE]
• Simulator?: ☑️ or ❌

[China77]

Please Offset , THX :) 非好好用的控件! Good PopMenu

[CaliCastle]

感谢提出issue但是此问题已经重复了 #14 This is a dupe of #14