我能够在iOS5中成功构建和运行我的应用程序，但是当我升级到ios6.1.0以安装插件，该插件将允许我使用vkwebview并引用本地HTML文件，我在XCode中遇到3个致命错误：
1.在类型“ CDVViewController *”的对象上找不到属性'Useragent'
2.使用未申报的标识符“ CDVUSERAGENTUTIL”。（这些重复两次）
我完全亏损，甚至开始寻找答案。
这是我的config.xml：
<?xml version='1.0' encoding='utf-8'?>
<widget id="com.slate.v2" version="1.3.1" xmlns="http://www.w3.org/ns/widgets" xmlns:gap="http://phonegap.com/ns/1.0">
<name>ACCELERATE RMS</name>
<description>
M-learning accelerated.
</description>
<author email="support@phonegap.com" href="http://phonegap.com">
Cnnect
</author>
<content src="index.html" />
<access origin="*" />
<allow-navigation href="*" />
<icon density="mdpi" height="57" platform="ios" src="icon.png" width="57" />
<config-file overwrite="true" parent="NSCameraUsageDescription" platform="ios" target="*-Info.plist">
<string>Allow the app to use your camera to take your profile picture.</string>
</config-file>
<preference name="AllowInlineMediaPlayback" value="true" />
<preference name="AndroidPersistentFileLocation" value="Compatibility" />
<platform name="ios">
<preference name="WKWebViewOnly" value="true" />
<feature name="CDVWKWebViewEngine">
<param name="ios-package" value="CDVWKWebViewEngine" />
</feature>
<preference name="CordovaWebViewEngine" value="CDVWKWebViewEngine" />
</platform>
<platform name="ios">
<preference name="Orientation" value="all" />
</platform>
<engine name="browser" spec="^5.0.4" />
<plugin name="phonegap-plugin-contentsync" spec="~1.4.2" />
<plugin name="cordova-plugin-camera" spec="~4.0.3" />
<plugin name="cordova-plugin-geolocation" spec="~4.0.1" />
<plugin name="cordova-plugin-file" spec="~6.0.1" />
<plugin name="cordova-plugin-whitelist" spec="~1.3.3" />
<plugin name="cordova-plugin-dialogs" spec="~2.0.1" />
<plugin name="cordova-plugin-local-notification" spec="~0.9.0-beta.3">
<variable name="ANDROID_SUPPORT_V4_VERSION" value="26.+" />
</plugin>
<plugin name="phonegap-plugin-barcodescanner" spec="~8.0.1" />
<plugin name="onesignal-cordova-plugin" spec="~2.8.1" />
<plugin name="cordova-plugin-file-transfer" spec="~1.7.1" />
<plugin name="cordova-plugin-wkwebview-engine" spec="^1.2.1" />
<plugin name="cordova-plugin-wkwebviewxhrfix" spec="~0.1.0" />
</widget>
对于 ionic v5用户，我已经通过升级 cordova-plugin-onic-webview 修复了此操作， 4.2.1
跳上这个帮助