バンドル内に配置される *.plist から取得すればいい。
こんな感じ。
[[[NSBundle mainBundle] infoDictionary] objectForKey:(NSString*)kCFBundleVersionKey];
代表的なキーは CFBundle.h で定義されている。以下、引用：
/* ===================== Standard Info.plist keys ===================== */
CF_EXPORT
const CFStringRef kCFBundleInfoDictionaryVersionKey;
/* The version of the Info.plist format */
CF_EXPORT
const CFStringRef kCFBundleExecutableKey;
/* The name of the executable in this bundle, if any */
CF_EXPORT
const CFStringRef kCFBundleIdentifierKey;
/* The bundle identifier (for CFBundleGetBundleWithIdentifier()) */
CF_EXPORT
const CFStringRef kCFBundleVersionKey;
/* The version number of the bundle. For Mac OS 9 style version numbers (for example "2.5.3d5"), */
/* clients can use CFBundleGetVersionNumber() instead of accessing this key directly since that */
/* function will properly convert the version string into its compact integer representation. */
CF_EXPORT
const CFStringRef kCFBundleDevelopmentRegionKey;
/* The name of the development language of the bundle. */
CF_EXPORT
const CFStringRef kCFBundleNameKey;
/* The human-readable name of the bundle. This key is often found in the InfoPlist.strings since it is usually localized. */
CF_EXPORT
const CFStringRef kCFBundleLocalizationsKey CF_AVAILABLE(10_2, 2_0);
/* Allows an unbundled application that handles localization itself to specify which localizations it has available. */
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