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You need to make use of the keychain to do what you want as user credentials are not allowed to pass on from one installed app to another app or the iOS system.<br />
<br />
<a href="https://developer.apple.com/documentation/security/keychain_services/keychain_items/using_the_keychain_to_manage_user_secrets" rel="ugc">https://developer.apple.com/documentation/security/keychain_services/keychain_items/using_the_keychain_to_manage_user_secrets</a>
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You need to make use of the keychain to do what you want as user credentials are not allowed to pass on from one installed app to another app or the iOS system.

https://developer.apple.com/documentation/security/keychain_services/keychain_items/using_the_keychain_to_manage_user_secrets [https://developer.apple.com/documentation/security/keychain_services/keychain_items/using_the_keychain_to_manage_user_secrets]

Richard Lloyd

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Thank you. I'll investigate
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I am developing a PWA that requires a variable containing the users authentication key to passed to the installed version when the user adds the application to their home screen.<br />
<br />
The android version maintains cookies and session ccokies in the install, but IOS loses cookies, session variables, querystrings and any other means of transferring the key to the app when it is installed. <br />
<br />
Is there a way to get round this sandboxing of the installed app to save users having to login again once they have installed the app on IOS?
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I am developing a PWA that requires a variable containing the users authentication key to passed to the installed version when the user adds the application to their home screen.

The android version maintains cookies and session ccokies in the install, but IOS loses cookies, session variables, querystrings and any other means of transferring the key to the app when it is installed. 

Is there a way to get round this sandboxing of the installed app to save users having to login again once they have installed the app on IOS?

Tranfer Auth Key to IOS PWA

iOS is a mobile operating system developed by Apple; it is a derivative of the Mac OS X desktop operating system, with which it shares many (but not all) common frameworks and other components. These include Cocoa Touch, the Mach/Darwin/XNU kernel and code from the Berkeley Software Distribution (BSD). Each iOS application runs in its own secure sandbox to prevent altering other applications, the operating system, or any other data.

cache

Installation is the act of making a computer program program ready for execution. Because the process varies programs often come with a specialized program responsible for doing whatever is needed for their installation. Installation may be part of a larger software deployment process. Cross platform installer builders that produce installers for Windows, Mac OS X and Linux include InstallAnywhere, InstallBuilder and Install4J. Installers for Microsoft Windows include Windows Installer, InstallShield, and Wise Installation Studio; free installer-authoring tools include NSIS, IzPack, Clickteam, InnoSetup, InstallSimple and WiX. Mac OS X includes Installer, and also includes a separate software updating application.

Installation

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.

JavaScript

Android is a mobile operating system developed by Google, based on the Linux kernel and designed primarily for touchscreen mobile devices such as smartphones and tablets. Android's user interface is based on direct manipulation, using touch gestures that loosely correspond to real-world actions, such as swiping, tapping and pinching, to manipulate on-screen objects, along with a virtual keyboard for text input. In addition to touchscreen devices, variants of Android are also used on notebooks, game consoles, digital cameras, televisions, automobiles and other electronics. Applications are usually developed in Java programming language using the Android software development kit (SDK), but other development environments are also available, including Delphi, Ruby and Visual Studio (using C++).