objective-c textfield drop-down menu to achieve

DropDownList
............\.DS_Store
__MACOSX
........\DropDownList
........\............\._.DS_Store
DropDownList\build
............\.....\DropDownList.build
............\.....\..................\DropDownList.pbxindex
............\.....\..................\.....................\categories.pbxbtree
............\.....\..................\.....................\cdecls.pbxbtree
............\.....\..................\.....................\decls.pbxbtree
............\.....\..................\.....................\files.pbxbtree
............\.....\..................\.....................\imports.pbxbtree
............\.....\..................\.....................\pbxindex.header
............\.....\..................\.....................\protocols.pbxbtree
............\.....\..................\.....................\refs.pbxbtree
............\.....\..................\.....................\strings.pbxstrings
............\.....\..................\.....................\..................\control
............\.....\..................\.....................\..................\strings
............\.....\..................\.....................\subclasses.pbxbtree
............\.....\..................\.....................\symbols0.pbxsymbols
__MACOSX\DropDownList\build
........\............\.....\DropDownList.build
........\............\.....\..................\._DropDownList.pbxindex
DropDownList\Classes
............\.......\DDList.h
__MACOSX\DropDownList\Classes
........\............\.......\._DDList.h
DropDownList\Classes\DDList.m
__MACOSX\DropDownList\Classes\._DDList.m
DropDownList\Classes\DropDownListAppDelegate.h
............\.......\DropDownListAppDelegate.m
............\.......\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
DropDownList\DropDownList-Info.plist
............\DropDownList.xcodeproj
............\......................\kingyee.mode1v3
............\......................\kingyee.pbxuser
............\......................\project.pbxproj
............\DropDownList_Prefix.pch
............\DropDownListViewController.xib
............\main.m
............\MainWindow.xib

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