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watchOS 8.1 Release Notes

Update your apps to use new features, and test your apps against API changes.

Overview

The watchOS 8 SDK provides support to develop watchOS apps for Apple Watch devices running watchOS 8.1. The SDK comes bundled with Xcode 13, available from the Mac App Store. For information on the compatibility requirements for Xcode 13, see Xcode 13 Release Notes.

CoreData

Known Issues

  • NSExpression immediately forbids certain operations that have significant side effects, like creating and destroying objects. Additionally, casting string class names into Class objects with NSConstantValueExpression is deprecated. (84017178)

    Workaround: Pass temporary objects to NSExpression in the context parameter of expressionValue(with:context:), or with NSPredicate as the substitutionVariables parameter of evaluate(with:substitutionVariables:). You can create a derived predicate with all the substitution variables replaced (bound), using withSubstitutionVariables(_:) on an existing NSPredicate so that code using the object can continue to use a simple evaluate(with object: Any?) invocation.

See Also

watchOS 8