This a similar the qq drop-down effect diagram, I' m doing a project reference, you need to download the study

qqlist
......\.DS_Store
......\bgd.jpg
......\bgd1.png
......\build
......\.....\Debug-iphonesimulator
......\.....\.....................\qqlist.app
......\.....\.....................\qqlist.app.dSYM
......\.....\.....................\...............\Contents
......\.....\.....................\...............\........\Info.plist
......\.....\.....................\...............\........\Resources
......\.....\.....................\...............\........\.........\DWARF
......\.....\.....................\...............\........\.........\.....\qqlist
......\.....\.....................\..........\bgd.jpg
......\.....\.....................\..........\bgd1.png
......\.....\.....................\..........\Default.png
......\.....\.....................\..........\icon.png
......\.....\.....................\..........\Info.plist
......\.....\.....................\..........\info.png
......\.....\.....................\..........\MainWindow.nib
......\.....\.....................\..........\normal.png
......\.....\.....................\..........\online.png
......\.....\.....................\..........\PkgInfo
......\.....\.....................\..........\pressed.png
......\.....\.....................\..........\qqlist
......\.....\.....................\..........\qqlistViewController.nib
......\.....\.....................\..........\source.plist
......\.....\.....................\..........\unOnline.png
......\.....\qqlist.build
......\.....\............\Debug-iphonesimulator
......\.....\............\.....................\qqlist.build
......\.....\............\.....................\............\build-state.dat
......\.....\............\.....................\............\build-state~.dat
......\.....\............\.....................\............\Objects-normal
......\.....\............\.....................\............\..............\i386
......\.....\............\.....................\............\..............\....\main.o
......\.....\............\.....................\............\..............\....\qqlist.LinkFileList
......\.....\............\.....................\............\..............\....\qqlistAppDelegate.o
......\.....\............\.....................\............\..............\....\qqlistViewController.o
......\.....\............\.....................\............\qqlist-all-target-headers.hmap
......\.....\............\.....................\............\qqlist-generated-files.hmap
......\.....\............\.....................\............\qqlist-own-target-headers.hmap
......\.....\............\.....................\............\qqlist-project-headers.hmap
......\.....\............\.....................\............\qqlist.dep
......\.....\............\.....................\............\qqlist.hmap
......\.....\............\.....................\............\qqlist~.dep
......\.....\............\qqlist.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
......\.....\............\Release-iphonesimulator
......\.....\............\.......................\qqlist.build
......\.....\............\.......................\............\build-state.dat
......\.....\............\.......................\............\build-state~.dat
......\.....\............\.......................\............\Objects-normal
......\.....\............\.......................\............\..

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