Countdown to achieve a small demo can be used to refer to

nstimer
.......\.DS_Store
__MACOSX
........\nstimer
........\.......\._.DS_Store
nstimer\Classes
.......\.......\nstimer.h
__MACOSX\nstimer\Classes
........\.......\.......\._nstimer.h
nstimer\Classes\nstimer.m
__MACOSX\nstimer\Classes\._nstimer.m
nstimer\Classes\nstimerAppDelegate.h
.......\.......\nstimerAppDelegate.m
.......\.......\nstimerViewController.h
__MACOSX\nstimer\Classes\._nstimerViewController.h
nstimer\Classes\nstimerViewController.m
__MACOSX\nstimer\Classes\._nstimerViewController.m
nstimer\main.m
.......\MainWindow.xib
.......\nstimer-Info.plist
.......\nstimer.xcodeproj
.......\.................\project.pbxproj
.......\.................\scottlin.mode1v3
.......\.................\scottlin.pbxuser
.......\nstimer_Prefix.pch
.......\nstimerViewController.xib

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