ionic 5 fails with white screen on ios

Question

my app runs just fine in browser. However, on ios using Xcode or on device it shows splash screen and then shows a white screen.

the logs in Xcode does not show any errors as such. Below is the reference

2020-06-06 23:01:29.214619-0700 Sales Bot[520:48223] Apache Cordova native platform version 6.0.0 is starting.
2020-06-06 23:01:29.214718-0700 Sales Bot[520:48223] Multi-tasking -> Device: YES, App: YES
2020-06-06 23:01:29.459458-0700 Sales Bot[520:48223] WF: === Starting WebFilter logging for process Sales Bot
2020-06-06 23:01:29.459508-0700 Sales Bot[520:48223] WF: _userSettingsForUser mobile: {
    filterBlacklist =     (
    );
    filterWhitelist =     (
    );
    restrictWeb = 1;
    useContentFilter = 0;
    useContentFilterOverrides = 0;
    whitelistEnabled = 0;
}
2020-06-06 23:01:29.459546-0700 Sales Bot[520:48223] WF: _WebFilterIsActive returning: NO
2020-06-06 23:01:29.471528-0700 Sales Bot[520:48223] The preference key "MediaPlaybackAllowsAirPlay" is not defined and will default to "TRUE"
2020-06-06 23:01:29.474877-0700 Sales Bot[520:48223] WF: _userSettingsForUser mobile: {
    filterBlacklist =     (
    );
    filterWhitelist =     (
    );
    restrictWeb = 1;
    useContentFilter = 0;
    useContentFilterOverrides = 0;
    whitelistEnabled = 0;
}
2020-06-06 23:01:29.474925-0700 Sales Bot[520:48223] WF: _WebFilterIsActive returning: NO
2020-06-06 23:01:29.475974-0700 Sales Bot[520:48223] The preference key "AllowBackForwardNavigationGestures" is not defined and will default to "FALSE"
2020-06-06 23:01:29.476031-0700 Sales Bot[520:48223] The preference key "Allow3DTouchLinkPreview" is not defined and will default to "TRUE"
2020-06-06 23:01:29.476072-0700 Sales Bot[520:48223] CDVWebViewEngine will reload WKWebView if required on resume
2020-06-06 23:01:29.476112-0700 Sales Bot[520:48223] Using WKWebView
2020-06-06 23:01:29.476344-0700 Sales Bot[520:48223] [CDVTimer][console] 0.048995ms
2020-06-06 23:01:29.476451-0700 Sales Bot[520:48223] [CDVTimer][handleopenurl] 0.046968ms
2020-06-06 23:01:29.477854-0700 Sales Bot[520:48223] Unlimited access to network resources
2020-06-06 23:01:29.477930-0700 Sales Bot[520:48223] [CDVTimer][intentandnavigationfilter] 1.428962ms
2020-06-06 23:01:29.478012-0700 Sales Bot[520:48223] [CDVTimer][gesturehandler] 0.043035ms
2020-06-06 23:01:29.479038-0700 Sales Bot[520:48223] [CDVTimer][statusbar] 0.966907ms
2020-06-06 23:01:29.479963-0700 Sales Bot[520:48223] [CDVTimer][splashscreen] 0.867009ms
2020-06-06 23:01:29.480120-0700 Sales Bot[520:48223] The preference key "KeyboardResize" is not defined and will default to "TRUE"
2020-06-06 23:01:29.480162-0700 Sales Bot[520:48223] CDVIonicKeyboard: resize mode 1
2020-06-06 23:01:29.480197-0700 Sales Bot[520:48223] The preference key "HideKeyboardFormAccessoryBar" is not defined and will default to "TRUE"
2020-06-06 23:01:29.480704-0700 Sales Bot[520:48223] The preference key "KeyboardAppearanceDark" is not defined and will default to "FALSE"
2020-06-06 23:01:29.480853-0700 Sales Bot[520:48223] [CDVTimer][cdvionickeyboard] 0.824928ms
2020-06-06 23:01:29.480897-0700 Sales Bot[520:48223] [CDVTimer][TotalPluginStartup] 4.652023ms
2020-06-06 23:01:29.595738-0700 Sales Bot[520:48223] The preference key "AutoHideSplashScreen" is not defined and will default to "TRUE"

i have already checked wkwebview article at https://ionicframework.com/docs/v3/wkwebview/ and have tried the steps to resolve white screen issue but no luck.

the config.xml looks like below

<?xml version='1.0' encoding='utf-8'?>
<widget id="xxxx" version="3.0.7" xmlns="http://www.w3.org/ns/widgets" xmlns:cdv="http://cordova.apache.org/ns/1.0">
    <name>Sales Bot</name>
    <description>xxxxx</description>
    <author email="xxxx" href="">xx</author>
    <content src="index.html" />
    <access origin="*" />
    <allow-intent href="http://*/*" />
    <allow-intent href="https://*/*" />
    <allow-intent href="tel:*" />
    <allow-intent href="sms:*" />
    <allow-intent href="mailto:*" />
    <allow-intent href="geo:*" />
    <allow-navigation href="*" />
    <allow-navigation href="http://localhost:8080/*" />
    <preference name="ScrollEnabled" value="false" />
    <preference name="android-minSdkVersion" value="19" />
    <preference name="BackupWebStorage" value="none" />
    <preference name="SplashMaintainAspectRatio" value="true" />
    <preference name="FadeSplashScreenDuration" value="300" />
    <preference name="SplashShowOnlyFirstTime" value="false" />
    <preference name="SplashScreen" value="/assets/logo.png" />
    <preference name="SplashScreenDelay" value="3000" />
    <preference name="WKWebViewOnly" value="true" />
    <feature name="CDVWKWebViewEngine">
        <param name="ios-package" value="CDVWKWebViewEngine" />
    </feature>
    <preference name="CordovaWebViewEngine" value="CDVWKWebViewEngine" />
    <platform name="android">
        <edit-config file="app/src/main/AndroidManifest.xml" mode="merge" target="/manifest/application" xmlns:android="http://schemas.android.com/apk/res/android">
            <application android:networkSecurityConfig="@xml/network_security_config" />
        </edit-config>
        <resource-file src="resources/android/xml/network_security_config.xml" target="app/src/main/res/xml/network_security_config.xml" />
        <allow-intent href="market:*" />
        <icon density="ldpi" src="resources/android/icon/drawable-ldpi-icon.png" />
        <icon density="mdpi" src="resources/android/icon/drawable-mdpi-icon.png" />
        <icon density="hdpi" src="resources/android/icon/drawable-hdpi-icon.png" />
        <icon density="xhdpi" src="resources/android/icon/drawable-xhdpi-icon.png" />
        <icon density="xxhdpi" src="resources/android/icon/drawable-xxhdpi-icon.png" />
        <icon density="xxxhdpi" src="resources/android/icon/drawable-xxxhdpi-icon.png" />
        <splash density="land-ldpi" src="resources/android/splash/drawable-land-ldpi-screen.png" />
        <splash density="land-mdpi" src="resources/android/splash/drawable-land-mdpi-screen.png" />
        <splash density="land-hdpi" src="resources/android/splash/drawable-land-hdpi-screen.png" />
        <splash density="land-xhdpi" src="resources/android/splash/drawable-land-xhdpi-screen.png" />
        <splash density="land-xxhdpi" src="resources/android/splash/drawable-land-xxhdpi-screen.png" />
        <splash density="land-xxxhdpi" src="resources/android/splash/drawable-land-xxxhdpi-screen.png" />
        <splash density="port-ldpi" src="resources/android/splash/drawable-port-ldpi-screen.png" />
        <splash density="port-mdpi" src="resources/android/splash/drawable-port-mdpi-screen.png" />
        <splash density="port-hdpi" src="resources/android/splash/drawable-port-hdpi-screen.png" />
        <splash density="port-xhdpi" src="resources/android/splash/drawable-port-xhdpi-screen.png" />
        <splash density="port-xxhdpi" src="resources/android/splash/drawable-port-xxhdpi-screen.png" />
        <splash density="port-xxxhdpi" src="resources/android/splash/drawable-port-xxxhdpi-screen.png" />
    </platform>
    <platform name="ios">
        <feature name="CDVWKWebViewEngine">
            <param name="ios-package" value="CDVWKWebViewEngine" />
        </feature>
        <preference name="CordovaWebViewEngine" value="CDVWKWebViewEngine" />
        <allow-intent href="itms:*" />
        <allow-intent href="itms-apps:*" />
        <icon height="57" src="resources/ios/icon/icon.png" width="57" />
        <icon height="114" src="resources/ios/icon/[email protected]" width="114" />
        <icon height="29" src="resources/ios/icon/icon-small.png" width="29" />
        <icon height="58" src="resources/ios/icon/[email protected]" width="58" />
        <icon height="87" src="resources/ios/icon/[email protected]" width="87" />
        <icon height="20" src="resources/ios/icon/icon-20.png" width="20" />
        <icon height="40" src="resources/ios/icon/[email protected]" width="40" />
        <icon height="60" src="resources/ios/icon/[email protected]" width="60" />
        <icon height="48" src="resources/ios/icon/[email protected]" width="48" />
        <icon height="55" src="resources/ios/icon/[email protected]" width="55" />
        <icon height="29" src="resources/ios/icon/icon-29.png" width="29" />
        <icon height="58" src="resources/ios/icon/[email protected]" width="58" />
        <icon height="87" src="resources/ios/icon/[email protected]" width="87" />
        <icon height="40" src="resources/ios/icon/icon-40.png" width="40" />
        <icon height="80" src="resources/ios/icon/[email protected]" width="80" />
        <icon height="120" src="resources/ios/icon/[email protected]" width="120" />
        <icon height="88" src="resources/ios/icon/[email protected]" width="88" />
        <icon height="50" src="resources/ios/icon/icon-50.png" width="50" />
        <icon height="100" src="resources/ios/icon/[email protected]" width="100" />
        <icon height="60" src="resources/ios/icon/icon-60.png" width="60" />
        <icon height="120" src="resources/ios/icon/[email protected]" width="120" />
        <icon height="180" src="resources/ios/icon/[email protected]" width="180" />
        <icon height="72" src="resources/ios/icon/icon-72.png" width="72" />
        <icon height="144" src="resources/ios/icon/[email protected]" width="144" />
        <icon height="76" src="resources/ios/icon/icon-76.png" width="76" />
        <icon height="152" src="resources/ios/icon/[email protected]" width="152" />
        <icon height="167" src="resources/ios/icon/[email protected]" width="167" />
        <icon height="172" src="resources/ios/icon/[email protected]" width="172" />
        <icon height="196" src="resources/ios/icon/[email protected]" width="196" />
        <icon height="1024" src="resources/ios/icon/icon-1024.png" width="1024" />
        <splash height="480" src="resources/ios/splash/Default~iphone.png" width="320" />
        <splash height="960" src="resources/ios/splash/Default@2x~iphone.png" width="640" />
        <splash height="1024" src="resources/ios/splash/Default-Portrait~ipad.png" width="768" />
        <splash height="768" src="resources/ios/splash/Default-Landscape~ipad.png" width="1024" />
        <splash height="1125" src="resources/ios/splash/Default-Landscape-2436h.png" width="2436" />
        <splash height="1242" src="resources/ios/splash/Default-Landscape-736h.png" width="2208" />
        <splash height="2048" src="resources/ios/splash/Default-Portrait@2x~ipad.png" width="1536" />
        <splash height="1536" src="resources/ios/splash/Default-Landscape@2x~ipad.png" width="2048" />
        <splash height="2732" src="resources/ios/splash/Default-Portrait@~ipadpro.png" width="2048" />
        <splash height="2048" src="resources/ios/splash/Default-Landscape@~ipadpro.png" width="2732" />
        <splash height="1136" src="resources/ios/splash/Default-568h@2x~iphone.png" width="640" />
        <splash height="1334" src="resources/ios/splash/Default-667h.png" width="750" />
        <splash height="2208" src="resources/ios/splash/Default-736h.png" width="1242" />
        <splash height="2436" src="resources/ios/splash/Default-2436h.png" width="1125" />
        <splash height="2732" src="resources/ios/splash/Default@2x~universal~anyany.png" width="2732" />
        <icon height="216" src="resources/ios/icon/[email protected]" width="216" />
        <splash height="2688" src="resources/ios/splash/Default-2688h~iphone.png" width="1242" />
        <splash height="1242" src="resources/ios/splash/Default-Landscape-2688h~iphone.png" width="2688" />
        <splash height="1792" src="resources/ios/splash/Default-1792h~iphone.png" width="828" />
        <splash height="828" src="resources/ios/splash/Default-Landscape-1792h~iphone.png" width="1792" />
    </platform>
    <plugin name="cordova-plugin-whitelist" spec="~1.3.3" />
    <plugin name="cordova-plugin-statusbar" spec="~2.4.2" />
    <plugin name="cordova-plugin-device" spec="~2.0.2" />
    <plugin name="cordova-plugin-splashscreen" spec="~5.0.2" />
    <plugin name="cordova-plugin-ionic-keyboard" spec="^2.0.5" />
</widget>

Answer 1

in my case the webview plugin was missing. it was earlier their but while trying to fix things for ios i ended up removing it. So i thought to check again for android and it was broken there too.

So, the only suspect i found was webview plugin. added and it worked on android. then same worked as is on ios too.