// 检查更新

- (void)updateVersion

{

    // 获取app版本

    NSDictionary *infoDictionary = [[NSBundlemainBundle] infoDictionary];

    NSString *currentVersion = [infoDictionary objectForKey:@"CFBundleVersion"];  //target里的build

    // 向服务器请求

    [selfrequestCheckUpdateDataWithDic:@{

                                          @"system": @"2",

                                          @"versionCode": currentVersion

                                          }];

}

// 获取app版本 (仅仅打印出"字符串"给用户看)

    NSDictionary *infoDictionary = [[NSBundlemainBundle] infoDictionary];

    NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"]; //target里的version

注意事项的链接  http://blog.csdn.net/holydancer/article/details/8895699

检查更新的version获取 注意事项