iOS 获取版本信息

• 版本信息
  1.方法一:

NSString *app_Version = [[[NSBundle mainBundle] infoDictionary] objectForKey:@"CFBundleShortVersionString"];

2.方法二:

NSString *app_Version = [[[NSBundle mainBundle] infoDictionary] objectForKey:(NSString *)kCFBundleVersionKey];