获取应用版本号

NSDictionary *infoDictionary = [[NSBundle mainBundle] infoDictionary]; // app名称  NSString *app_Name = [infoDictionary objectForKey:@"CFBundleDisplayName"];    // app版本  NSString *app_Version = [infoDictionary objectForKey:@"CFBundleShortVersionString"];    // app build版本  NSString *app_build = [infoDictionary objectForKey:@"CFBundleVersion"];