[UIWebView] Input fields inside iframe doesn't accept input on iOS #1106

Original issue by @sanidkpc on 2019-02-12T11:13:12Z

Ionic version:

[x] 4.x

I'm submitting a ...

[x ] bug report
[ ] feature request

Current behavior:

On iOS, text input inside an <iframe> won't receive any text value when typing using device keyboard. Immediately after tapping on the text input, the device keyboard popup then typing on keyboard, text input won't receive any value.

Expected behavior:

Input fields inside an iframe should behave as they do in a mobile web browser. The user should be able to drag the cursor and select/delete text and then be able to continue typing in the text field.

Other information:

Using WkWebView cordova-plugin-ionic-webview from https://github.com/ionic-team/cordova-plugin-ionic-webview. I can type in the input field inside the iframe but this plugin has some major issues with cookies set/stored in iOS. In our app authentication, cookies are not set/stored in iOS or ignored on First Application Execution [simulator or physical device].
WkWebView cookies related issues:
ionic-team/cordova-plugin-ionic-webview#22
ionic-team/cordova-plugin-ionic-webview#300

Iframe Content:

Iframe remote src content are written in AngularJS.

System info:

xcode: Version 10.1 (10B61)
Device: iPhone 7 plus v 11.4

Ionic info:

Ionic:

   ionic (Ionic CLI)  : 4.0.1
   Ionic Framework    : ionic-angular 3.9.2
   @ionic/app-scripts : 3.1.8

Cordova:

   cordova (Cordova CLI) : 8.1.2 (cordova-lib@8.1.1)
   Cordova Platforms     : browser 5.0.4, ios 4.5.4

System:

   Android SDK Tools : 26.1.1
   ios-deploy        : 1.9.4
   NodeJS            : v8.11.2 (/usr/local/bin/node)
   npm               : 6.2.0
   OS                : macOS High Sierra
   Xcode             : Xcode 10.1 Build version 10B61

Environment:

   ANDROID_HOME : /Users/bs228/Library/Android/sdk