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How, or can you, define conformances for a type in a library?
I've created a library that defines an encoded reference type, and was in the process of adding Transferrable conformance to the main class that represents the data. Doing so wants a type defined for the transferrable, so I'm adding a type for this data representation into the library. The extension on UniformTypeIdentifiers is trivial, but I'd like to also mark that the type itself conforms to public.data (UTType.data). Since this is in a swift package, there isn't an application-relevant Info.plist that would normally hold these additional details. Can I add the conformance through the library? Or is the whole aspect of Transferrable and associated UTTypes expected to be something only defined at the application level?
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1.1k
Aug ’23
Question about formatting of Measurement<...> items
I was experimenting in a playground with the specifying the kind of measurement with MeasurementUnit and then formatting it with the new foundation formatters, specifically MeasurementFormatter. The particular example I was using is a UnitDuration, exploring the various options and outputs. let times = [1,10,100,1000,10103,2354,83674,182549].map { Measurement<UnitDuration>(value: $0, unit: .microseconds) } print("unitStyle: .medium, unitOptions: .providedUnit") f.unitOptions = .providedUnit f.unitStyle = .medium for t in times {     print(f.string(from: t)) } What I gathered from this exploration is that the unit you use when you create a Measurement<UnitDuration> is stashed within it - in this case I created them with microseconds. What I'd like to do have a uniform scale for the times I'm printing that more aligned with the size based on the values. For example, if all my examples are recorded in microseconds, but more usefully represent milliseconds - is there a way to deal with this just in the formatting itself? I tried updating the unit representation to transform the MeasurementUnit<Duration> instances, but the unit property is a constant: Cannot assign to property: 'unit' is a 'let' constant. I did find the convert(to:) that would let me transform to another specific unit. Is there, by chance, any way to pass in the unit to use directly to a MeasurementFormatter instance, or do I need to back out and transform the various instances to get to a specific unit? Likewise, are there any built-in methods to MeasurementUnit that align the SI units chosen to the scale of the data being used as a value? Or is that something I'd need to create a heuristic/algorithm to and do and apply it myself when I wanted that result?
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1.3k
Mar ’22
Loading a lighting resource for a RealityKit view on macOS - image not embedded in app bundle
I'm trying to load up a virtual skybox, different from the built-in default, for a simple macOS rendering of RealityKit content. I was following the detail at https://developer.apple.com/documentation/realitykit/environmentresource, and created a folder called "light.skybox" with a single file in it ("prairie.hdr"), and then I'm trying to load that and set it as the environment on the arView when it's created: let ar = ARView(frame: .zero) do { let resource = try EnvironmentResource.load(named: "prairie") ar.environment.lighting.resource = resource } catch { print("Unable to load resource: \(error)") } The loading always fails when I launch the sample app, reporting "Unable to load resource ..." and when I look in the App bundle, the resource that's included there as Contents/Resources/light.realityenv is an entirely different size - appearing to be the default lighting. I've tried making the folder "light.skybox" explicitly target the app bundle for inclusion, but I don't see it get embedded with it toggle that way, or just default. Is there anything I need to do to get Xcode to process and include the lighting I'm providing? (This is inspired from https://stackoverflow.com/questions/77332150/realitykit-how-to-disable-default-lighting-in-nonar-arview, which shows an example for UIKit)
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1k
Aug ’24
debugging issues with Shared Private Key Bonjour connections
Like the post at https://forums.developer.apple.com/forums/thread/118035, I'm hitting an issue where I'm receiving: boringssl_session_set_peer_verification_state_from_session(448) [C1.1.1.1:2][0x12b667210] Unable to extract cached certificates from the SSL_SESSION object In my app logs. I tried to pin the SSL version to TLS 1.2 per Quinn's advice in that post, and then started digging further enabling CFNETWORK_DIAGNOSTICS=3 to see what was exposed on the Console.log (since it didn't show up in the Xcode console) The related log lines: 0 debug boringssl 15:43:04.978874-0700 MeetingNotes boringssl_context_log_message(2206) [C5:2][0x11080a760] Reading SSL3_RT_HANDSHAKE 16 bytes 0 debug boringssl 15:43:04.979007-0700 MeetingNotes boringssl_context_log_message(2206) [C5:2][0x11080a760] Writing SSL3_RT_CHANGE_CIPHER_SPEC 1 bytes 0 debug boringssl 15:43:04.979141-0700 MeetingNotes boringssl_context_log_message(2206) [C5:2][0x11080a760] Writing SSL3_RT_HANDSHAKE 16 bytes 0 debug boringssl 15:43:04.979260-0700 MeetingNotes nw_protocol_boringssl_write_bytes(87) [C5:2][0x11080a760] write request: 51 0 debug boringssl 15:43:04.979387-0700 MeetingNotes nw_protocol_boringssl_write_bytes(158) [C5:2][0x11080a760] total bytes written: 51 921460 debug boringssl 15:43:09.937961-0700 MeetingNotes boringssl_context_log_message(2206) [C5:2][0x11080a760] Writing SSL3_RT_ALERT 2 bytes 0 error boringssl 15:43:04.979630-0700 MeetingNotes boringssl_session_set_peer_verification_state_from_session(448) [C5:2][0x11080a760] Unable to extract cached certificates from the SSL_SESSION object Have a number of references to SSL3_RT in the messages, and I was curious if that indicated that I was using TLS1.3, which apparently doesn't support private shared keys. The constraints that I used riffs on the sample code from the tic-tac-toe example project: private static func tlsOptions(passcode: String) -> NWProtocolTLS.Options { let tlsOptions = NWProtocolTLS.Options() let authenticationKey = SymmetricKey(data: passcode.data(using: .utf8)!) let authenticationCode = HMAC<SHA256>.authenticationCode( for: "MeetingNotes".data(using: .utf8)!, using: authenticationKey ) let authenticationDispatchData = authenticationCode.withUnsafeBytes { DispatchData(bytes: $0) } // Private Shared Key (https://datatracker.ietf.org/doc/html/rfc4279) is *not* supported in // TLS 1.3 [https://tools.ietf.org/html/rfc8446], so this pins the TLS options to use version 1.2: // @constant tls_protocol_version_TLSv12 TLS 1.2 [https://tools.ietf.org/html/rfc5246] sec_protocol_options_set_max_tls_protocol_version(tlsOptions.securityProtocolOptions, .TLSv12) sec_protocol_options_set_min_tls_protocol_version(tlsOptions.securityProtocolOptions, .TLSv12) sec_protocol_options_add_pre_shared_key( tlsOptions.securityProtocolOptions, authenticationDispatchData as __DispatchData, stringToDispatchData("MeetingNotes")! as __DispatchData ) /* RFC 5487 - PSK with SHA-256/384 and AES GCM */ // Forcing non-standard cipher suite value to UInt16 because for // whatever reason, it can get returned as UInt32 - such as in // GitHub actions CI. let ciphersuiteValue = UInt16(TLS_PSK_WITH_AES_128_GCM_SHA256) sec_protocol_options_append_tls_ciphersuite( tlsOptions.securityProtocolOptions, tls_ciphersuite_t(rawValue: ciphersuiteValue)! ) return tlsOptions } Is there something I'm missing in setting up the proper constraints to request TLS version 1.2 with a private shared key to be used? And beyond that, any suggestions for debugging or narrowing down what might be failing?
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1.2k
Apr ’24