iOS 获取版本信息之类的问题，整理一小部分
1：获取bundle Id信息：[[NSBundle mainBundle]bundleIdentifier]；
2: 获取App显示名：[[[NSBundle mainBundle]infoDictionary] objectForKey:@"CFBundleDisplayName"];
3：获取版本号：[[[NSBundle mainBundle]infoDictionary] objectForKey:@"CFBundleVersion"];
[[NSBundle mainBundle]infoDictionary] 获得的是一个字典，里边放着Info.plist文件中的各种信息，根据不同的键去即可，如：
CFBundleDevelopmentRegion
CFBundleDisplayName
CFBundleExecutable
CFBundleExecutablePath
CFBundleIdentifier
CFBundleInfoDictionaryVersion = "6.0";
CFBundleInfoPlistURL
CFBundleName
CFBundlePackageType
CFBundleShortVersionString
CFBundleSignature
CFBundleSupportedPlatforms
