the source code of "IPhone for Programmers：An App-Driven Approach " Chapter 8- cannon game applications, . Focus on and deal with NSTimer drag events to achieve animation.

CannonGame
..........\.DS_Store
..........\blocker_hit.wav
..........\build
..........\.....\CannonGame.build
..........\.....\................\CannonGame.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
........\CannonGame
........\..........\build
........\..........\.....\CannonGame.build
........\..........\.....\................\._CannonGame.pbxindex
CannonGame\build\CannonGame.build\Debug
..........\.....\................\.....\CannonGame.build
..........\.....\................\.....\................\build-state.dat
..........\.....\................\.....\................\CannonGame.dep
..........\.....\................\Debug-iphoneos
..........\.....\................\..............\CannonGame.build
..........\.....\................\..............\................\CannonGame-all-target-headers.hmap
..........\.....\................\..............\................\CannonGame-generated-files.hmap
..........\.....\................\..............\................\CannonGame-own-target-headers.hmap
..........\.....\................\..............\................\CannonGame-project-headers.hmap
..........\.....\................\..............\................\CannonGame.dep
..........\.....\................\..............\................\CannonGame.hmap
..........\.....\................\..............\................\CannonGame.xcent
..........\.....\................\..............\................\CannonGame~.dep
..........\.....\................\..............\................\Objects-normal
..........\.....\................\..............\................\..............\armv6
..........\.....\................\..............\................\..............\.....\CannonGame.LinkFileList
..........\.....\................\..............\................\..............\.....\CannonGameAppDelegate.o
..........\.....\................\..............\................\..............\.....\CannonGameViewController.o
..........\.....\................\..............\................\..............\.....\CannonView.o
..........\.....\................\..............\................\..............\.....\main.o
..........\.....\................\Debug-iphonesimulator
..........\.....\................\.....................\CannonGame.build
..........\.....\................\.....................\................\build-state.dat
..........\.....\................\.....................\................\build-state~.dat
..........\.....\................\.....................\................\CannonGame-all-target-headers.hmap
..........\.....\................\.....................\................\CannonGame-generated-files.hmap
..........\.....\................\.....................\................\CannonGame-own-target-headers.hmap
..........\.....\................\.....................\................\CannonGame-project-headers.hmap
..........\.....\................\.....................\................\CannonGame.dep
..........\.....\................\.....................\................\CannonGame.hmap
..........\.....\................\.....................\................\CannonGame~.dep
..........\.....\................\.......

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