Version 100.11.0 of the ArcGIS Runtime SDK for iOS adopted Apple's recommended approach for handling OAuth authentication, using ASWebAuthenticationSession. This formalizes the handling of OAuth authentication, decoupling it from the UIApplicationDelegate and other application URL handling.
Apple’s recent iOS 14.5 release updates ASWebAuthenticationSession, causing a crash when using Runtime 100.11.0 with typical ArcGIS OAuth configurations. This crash occurs in Debug builds. It does not currently appear to affect Release builds.
The Runtime team has identified a solution which we expect to release soon. No code change will be required in your apps, but in the meantime please be aware that if you are using ArcGIS Runtime SDK for iOS version 100.11.0 with iOS 14.5, OAuth workflows will cause your app to crash.
This does not affect ArcGIS Runtime SDKs for .NET or Qt when targeting iOS, and does not affect ArcGIS Runtime SDK for iOS 100.10 or earlier, or iOS versions prior to 14.5.