Historically iOS applications have had a number of limitations when running on a device, as Apple disallows the execution of dynamically generated code. Applications are compiled “Ahead of Time” (AOT) before deployment because of this. You can read more about this architecture here.
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Important changes are coming to watchOS! Checkout our support for Apple Watch Series 4 new processor architecture, ARM64_32 based on the Xamarin.iOS SDKs shipping with Visual Studio 2019 and Visual Studio 2019 for Mac.