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Apple Platforms

NIO offers extensions to provide first-class support for Apple platforms (iOS 12+, macOS 10.14+, tvOS 12+, watchOS 6+) via NIO Transport Services. NIO Transport Services uses Network.framework and DispatchQueues to schedule tasks.

To use NIO Transport Services in gRPC Swift you need to provide a NIOTSEventLoopGroup to the builder for your client or server. gRPC Swift provides a helper method to provide the correct EventLoopGroup based on the network preference:

PlatformSupport.makeEventLoopGroup(loopCount:networkPreference:) -> EventLoopGroup

Here networkPreference defaults to .best, which chooses the .networkFramework implementation if it is available (iOS 12+, macOS 10.14+, tvOS 12+, watchOS 6+) and uses .posix otherwise.

Note that the TLS implementation used by gRPC depends on the type of EventLoopGroup provided to the client or server and that some combinations are not supported. See the TLS docs for more.