it is useful to study tableview.

DropDownList
............\.DS_Store
__MACOSX
........\DropDownList
........\............\._.DS_Store
DropDownList\build
............\.....\DropDownList.build
............\.....\..................\DropDownList.pbxindex
............\.....\..................\.....................\categories.pbxbtree
__MACOSX\DropDownList\build
........\............\.....\DropDownList.build
........\............\.....\..................\DropDownList.pbxindex
........\............\.....\..................\.....................\._categories.pbxbtree
DropDownList\build\DropDownList.build\DropDownList.pbxindex\cdecls.pbxbtree
__MACOSX\DropDownList\build\DropDownList.build\DropDownList.pbxindex\._cdecls.pbxbtree
DropDownList\build\DropDownList.build\DropDownList.pbxindex\decls.pbxbtree
__MACOSX\DropDownList\build\DropDownList.build\DropDownList.pbxindex\._decls.pbxbtree
DropDownList\build\DropDownList.build\DropDownList.pbxindex\files.pbxbtree
__MACOSX\DropDownList\build\DropDownList.build\DropDownList.pbxindex\._files.pbxbtree
DropDownList\build\DropDownList.build\DropDownList.pbxindex\imports.pbxbtree
__MACOSX\DropDownList\build\DropDownList.build\DropDownList.pbxindex\._imports.pbxbtree
DropDownList\build\DropDownList.build\DropDownList.pbxindex\pbxindex.header
__MACOSX\DropDownList\build\DropDownList.build\DropDownList.pbxindex\._pbxindex.header
DropDownList\build\DropDownList.build\DropDownList.pbxindex\protocols.pbxbtree
__MACOSX\DropDownList\build\DropDownList.build\DropDownList.pbxindex\._protocols.pbxbtree
DropDownList\build\DropDownList.build\DropDownList.pbxindex\refs.pbxbtree
__MACOSX\DropDownList\build\DropDownList.build\DropDownList.pbxindex\._refs.pbxbtree
DropDownList\build\DropDownList.build\DropDownList.pbxindex\strings.pbxstrings
............\.....\..................\.....................\..................\control
__MACOSX\DropDownList\build\DropDownList.build\DropDownList.pbxindex\strings.pbxstrings
........\............\.....\..................\.....................\..................\._control
DropDownList\build\DropDownList.build\DropDownList.pbxindex\strings.pbxstrings\strings
__MACOSX\DropDownList\build\DropDownList.build\DropDownList.pbxindex\strings.pbxstrings\._strings
........\............\.....\..................\.....................\._strings.pbxstrings
DropDownList\build\DropDownList.build\DropDownList.pbxindex\subclasses.pbxbtree
__MACOSX\DropDownList\build\DropDownList.build\DropDownList.pbxindex\._subclasses.pbxbtree
DropDownList\build\DropDownList.build\DropDownList.pbxindex\symbols0.pbxsymbols
__MACOSX\DropDownList\build\DropDownList.build\DropDownList.pbxindex\._symbols0.pbxsymbols
........\............\.....\..................\._DropDownList.pbxindex
........\............\.....\._DropDownList.build
........\............\._build
DropDownList\Classes
............\.......\DDList.h
__MACOSX\DropDownList\Classes
........\............\.......\._DDList.h
DropDownList\Classes\DDList.m
__MACOSX\DropDownList\Classes\._DDList.m
DropDownList\Classes\DropDownListAppDelegate.h
__MACOSX\DropDownList\Classes\._DropDownListAppDelegate.h
DropDownList\Classes\DropDownListAppDelegate.m
__MACOSX\DropDownList\Classes\._DropDownListAppDelegate.m
DropDownList\Classes\DropDownListViewController.h
__MACOSX\DropDownList\Classes\._DropDownListViewController.h
DropDownList\Classes\DropDownListViewController.m
__MACOSX\DropDownList\Classes\._DropDownListViewController.m
DropDownList\Classes\PassValueDelegate.h
__MACOSX\DropDownList\Classes\._PassValueDelegate.h
........\............\._Classes
DropDownList\DropDownList-Info.plist
__MACOSX\DropDownList\._DropDownList-Info.plist
DropDownList\DropDownList.xcodeproj
............\......................\kingyee.mode1v3
__MACOSX\DropDownList\DropDownList.xcodeproj
........\............\......................\._kingyee.mode1v3
DropDownList\DropDownList.xcodeproj\kingyee.pbxuser
__MACOSX\DropDownList\DropDownList.xcodeproj\._kingyee.pbxuser
DropDownList\DropDownList.xcodeproj\project.pbxproj
__MACOSX\DropDownList\DropDownList.xcodeproj\._project.pbxproj
DropDownList\DropDownList.xcodeproj\pr

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