IPhone UI development skills to achieve CheckBox BECheckBox featured article, learning IOS programming source code, a good reference.

BECheckBox
..........\.DS_Store
..........\BECheckBox-Info.plist
..........\BECheckBox.xcodeproj
..........\....................\lexliu-mac.mode1v3
..........\....................\lexliu-mac.pbxuser
..........\....................\project.pbxproj
..........\BECheckBox_Prefix.pch
..........\build
..........\.....\BECheckBox.build
..........\.....\................\BECheckBox.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
..........\.....\................\Debug-iphonesimulator
..........\.....\................\.....................\BECheckBox.build
..........\.....\................\.....................\................\BECheckBox-all-target-headers.hmap
..........\.....\................\.....................\................\BECheckBox-generated-files.hmap
..........\.....\................\.....................\................\BECheckBox-own-target-headers.hmap
..........\.....\................\.....................\................\BECheckBox-project-headers.hmap
..........\.....\................\.....................\................\BECheckBox.dep
..........\.....\................\.....................\................\BECheckBox.hmap
..........\.....\................\.....................\................\BECheckBox~.dep
..........\.....\................\.....................\................\build-state.dat
..........\.....\................\.....................\................\build-state~.dat
..........\.....\................\.....................\................\Objects-normal
..........\.....\................\.....................\................\..............\i386
..........\.....\................\.....................\................\..............\....\BECheckBox.LinkFileList
..........\.....\................\.....................\................\..............\....\BECheckBox.o
..........\.....\................\.....................\................\..............\....\BECheckBoxAppDelegate.o
..........\.....\................\.....................\................\..............\....\BECheckBoxViewController.o
..........\.....\................\.....................\................\..............\....\main.o
..........\.....\Debug-iphonesimulator
..........\.....\.....................\BECheckBox.app
..........\.....\.....................\BECheckBox.app.dSYM
..........\.....\.....................\...................\Contents
..........\.....\.....................\...................\........\Info.plist
..........\.....\.....................\...................\........\Resources
..........\.....\.....................\...................\........\.........\DWARF
..........\.....\.....................\...................\........\.........\.....\BECheckBox
..........\.....\.....................\..............\BECheckBox
..........\.....\.....................\..............\com_btn_check.png
..........\.....\.....................\..............\com_btn_check@2x.png
..........\.....\.....................\..............\com_btn_checked.png
..........\.....\.....................\..............\com_btn_checked@2x.png
..........\.....\.....................\..............\Info.plist
..........\.....\..................

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