右上角加号点击弹出效果demo，附上效果图

单军华

2016-12-23 5e0025a973fb918f9790fa950d862e713acc807f

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<?xml version="1.0" encoding="UTF-8"?>
<Workspace
   version = "1.0">
   <FileRef
      location = "self:Popover.xcodeproj">
   </FileRef>
</Workspace>