![]() ![]() The instance is available through the shared and companion properties.Īccess objects through in Objective-C and MySingleton() in Swift has been deprecated. Kotlin singleton (made with an object declaration, including companion object) is imported to Swift/Objective-C as a class with a single instance. Kotlin extensions to other types are treated as top-level declarations with an additional receiver parameter. Kotlin extensions to "regular" Kotlin classes are imported to Swift and Objective-C as extensions and category members respectively. And the extension initializers aren't available as Kotlin constructors. That's why these declarations can't be overridden in Kotlin. Members of Objective-C categories and Swift extensions are imported to Kotlin as extensions. Learn more about the async/ await mechanism in Swift. Currently, this functionality is highly experimental and has certain limitations. Starting from Swift 5.5, Kotlin's suspend functions are also available for calling from Swift as async functions without using the completion handlers. Kotlin's suspending functions ( suspend) are presented in the generated Objective-C headers as functions with callbacks, or completion handlers in Swift/Objective-C terminology. We would appreciate your feedback on it in YouTrack. It may be dropped or changed at any time. Support for calling suspend functions from Swift code as async is Experimental. Note that the opposite reversed translation is not implemented yet: Swift/Objective-C error-throwing methods aren't imported to Kotlin as exception-throwing. Non- suspend functions without don't propagate Kotlin exceptions at all. Suspend functions without propagate only CancellationException as NSError. Other Kotlin exceptions reaching Swift/Objective-C are considered unhandled and cause program termination. When Kotlin function called from Swift/Objective-C code throws an exception which is an instance of one of the classes or their subclasses, it is propagated as NSError. Representations for suspend functions always have NSError*/ Error parameter in completion handler. When compiling to Objective-C/Swift framework, non- suspend functions having or inheriting annotation are represented as NSError*-producing methods in Objective-C and as throws methods in Swift. So if Swift or Objective-C code calls a Kotlin method which throws an exception to be handled, then the Kotlin method should be marked with a annotation specifying a list of "expected" exception classes. Kotlin has no concept of checked exceptions, all Kotlin exceptions are unchecked. The methods of kotlin.Any ( equals(), hashCode() and toString()) are mapped to the methods isEquals:, hash and description in Objective-C, and to the method isEquals(_:) and the properties hash, description in Swift. Each Kotlin file is translated into such a class. Top-level Kotlin functions and properties are accessible as members of special classes. Same goes for a protocol's read-only properties that are implemented as mutable. Writeable Objective-C properties overriding read-only properties of the superclass are represented as setFoo() method for the property foo. Kotlin constructors are imported as initializers to Swift/Objective-C. The latter happens with initializers declared in the Objective-C category or as a Swift extension, because Kotlin has no concept of extension constructors. Swift/Objective-C initializers are imported to Kotlin as constructors and factory methods named create. As a workaround, you can rename the conflicting Kotlin classes in the framework. This algorithm is not stable yet and can change between Kotlin releases. Thus, the Kotlin compiler renames Kotlin classes which have the same name but different package in the same framework. ![]() Objective-C does not support packages in a framework. The prefix is derived from the framework name. The names of Kotlin classes and interfaces are prefixed when imported to Objective-C. These classes and interfaces are placed into a package specified in build configuration ( platform.* packages for preconfigured system frameworks). ![]()
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