iOS 代码实现获得应用的版本号（Version／Build）
［1］概念
iOS的版本号，一个叫做Version，一个叫做Build，这两个值都可以在Xcode 中选中target，点击“Summary”后看到。 Version在plist文件中的key是“CFBundleShortVersionString”，和AppStore上的版本号保持一致，Build在plist中的key是“CFBundleVersion”，代表build的版本号，该值每次build之后都应该增加1。这两个值都可以在程序中通过下面的代码获得：
[[[NSBundle mainBundle] infoDictionary] valueForKey:@"key"]［2］具体实现
代码实现获得应用的Verison号：
<code style="padding: 0px; margin: 0px; white-space: nowrap; border: 0px; border-radius: 3px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline; background-color: rgb(246, 246, 246);"><span style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; font-size: 14px;"><span class="pun" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">[[[</span><span class="typ" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; color: rgb(43, 145, 175); border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">NSBundle</span><span class="pln" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;"> mainBundle</span><span class="pun" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">]</span><span class="pln" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;"> infoDictionary</span><span class="pun" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">]</span><span class="pln" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;"> objectForKey</span><span class="pun" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">:@</span><span class="str" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; color: rgb(128, 0, 0); border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">"CFBundleShortVersionString"</span><span class="pun" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">]</span></span></code>
或
<code style="padding: 0px; margin: 0px; white-space: nowrap; border: 0px; border-radius: 3px; font-family: Consolas, Menlo, Monaco, 'Lucida Console', 'Liberation Mono', 'DejaVu Sans Mono', 'Bitstream Vera Sans Mono', 'Courier New', monospace, serif; vertical-align: baseline; background-color: rgb(246, 246, 246);"><span style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; font-size: 14px;"><span class="pun" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">[[</span><span class="typ" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; color: rgb(43, 145, 175); border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">NSBundle</span><span class="pln" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;"> mainBundle</span><span class="pun" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">]</span><span class="pln" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;"> objectForInfoDictionaryKey</span><span class="pun" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">:@</span><span class="str" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; color: rgb(128, 0, 0); border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">"CFBundleShortVersionString"</span><span class="pun" style="padding: 0px; margin: 0px; line-height: 25.2000007629395px; border: 0px; vertical-align: baseline; background: none 0% 0% repeat scroll transparent;">];</span></span></code>
[[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleVersion"]
转载链接：http://www.open-open.com/lib/view/open1411817778203.html
经验来自：
［1］http://joeyio.com/ios/2013/05/25/xcode-version-management/
［2］http://stackoverflow.com/questions/7957794/how-to-get-your-own-app-version-from-xcode
[ 3 ]http://blog.csdn.net/linzhiji/article/details/8173503