!SignalR-Client-Swift.swift

Snippets 

CocoaPods

use_frameworks!
pod 'SwiftSignalRClient'

HubConnectionBuilder.swift

let hubConnection = HubConnectionBuilder(url: URL(string: "http://localhost:5000/playground")!)
    .withLogging(minLogLevel: .debug)
    .build()

HubConnectionDelegate.swift

public protocol HubConnectionDelegate: class {
    func connectionDidOpen(hubConnection: HubConnection)
    func connectionDidFailToOpen(error: Error)
    func connectionDidClose(error: Error?)
}

Invoke.swift

// invoking a hub method and receiving a result
hubConnection.invoke(method: "Add", 2, 3, resultType: Int.self) { result, error in
    if let error = error {
        print("error: \(error)")
    } else {
        print("Add result: \(result!)")
    }
}

// invoking a hub method that does not return a result
hubConnection.invoke(method: "Broadcast", "Playground user", "Sending a message") { error in
    if let error = error {
        print("error: \(error)")
    } else {
        print("Broadcast invocation completed without errors")
    }
}

InvokeArray.swift

hubConnection.invoke(method: "Add", arguments: [2, 3], resultType: Int.self) { result, error in
    if let error = error {
        print("error: \(error)")
    } else {
        print("Add result: \(result!)")
    }
}

On.swift

hubConnection.on(method: "AddMessage") {(user: String, message: String) in
    print(">>> \(user): \(message)")
}

OnArgumentExtractor.swift

hubConnection.on(method: "AddMessage", callback: { argumentExtractor in
    let user = try argumentExtractor.getArgument(type: String.self)
    var message = ""
    if argumentExtractor.hasMoreArgs() {
        message = try argumentExtractor.getArgument(type: String.self)
    }
    print(">>> \(user): \(message)")
})

Send.swift

hubConnection.send(method: "Broadcast", "Playground user", "Testing send") { error in
    if let error = error {
        print("Send failed: \(error)")
    }
}

Start.swift

hubConnection.start()

Stop.swift

hubConnection.stop()

Stream.swift

let streamHandle = hubConnection.stream(method: "StreamNumbers", 1, 10000, itemType: Int.self,
                                        streamItemReceived: { item in print(">>> \(item!)") }) { error in
        print("Stream closed.")
        if let error = error {
            print("Error: \(error)")
        }
    }

DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(2)) {
    hubConnection.cancelStreamInvocation(streamHandle: streamHandle) { error in
        print("Canceling stream invocation failed: \(error)")
    }
}

Hello

I am using this library.

I try to invoke method

    hubConnection.invoke(method: "getUserStatus", "e30fca3b-a2b9-4200-b89c-13f68a1226b2", resultType: pStatus.self) { result, error in
        if let error = error {
            print("fapa==error: \(error)")
        } else {
            print("fapa==Add result: \(result!)")
        }
    }

I want to read the response.

From below link, I create the class & set it as resultType: pStatus.self in above method.
https://gist.github.com/moozzyk/be9be3881e36191891ead2980108bcc5

I get response as below.

2019-11-17T11:53:58.879Z debug: Message received: {"type":1,"target":"partnerStatus","arguments":[{"UserId":"e30fca3b-a2b9-4200-b89c-13f68a1226b2","Online":false,"Status":"Last Seen 08/11/2019 07:19 ص","LastSeen":"2019-11-08T07:19:58.8444713"}]}
2019-11-17T11:53:58.879Z debug: Message received: {"type":3,"invocationId":"1","result":null}

Also I get below log.

2019-11-17T11:53:58.879Z debug: Server method with invocationId 1 completed successfully
2019-11-17T11:53:58.879Z error: Error while getting result for server method with invocationId 1
fapa==error: serializationError(underlyingError: Swift.DecodingError.valueNotFound(Swift.KeyedDecodingContainer<ChatTestSignalR.pStatus.(unknown context at $10924b7e0).CodingKeys>, Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "result", intValue: nil)], debugDescription: "Cannot get keyed decoding container -- found null value instead.", underlyingError: nil)))

I am not understanding why I didn't get response for my main method of getUserStatus?

I also get message as "No handler registered for method 'partnerStatus'"

The getUserStatus status method is supposed to return pStatus but it returned null hence the error 'while getting result for server method with invocationId 1'.

"No handler registered for method 'partnerStatus'" means that the server invoked a client method but there was no code registered to handle this invocation. You register handlers with the HubConnection.on method.

Hi
I have more than 8 args in "on" function what should i do?!!!

func on<T1: Decodable, T2: Decodable, T3: Decodable, T4: Decodable, T5: Decodable, T6: Decodable, T7: Decodable, T8: Decodable>(method: String, callback: @escaping (_ arg1: T1, _ arg2: T2, _ arg3: T3, _ arg4: T4, _ arg5: T5, _ arg6: T6, _ arg7: T7, _ arg8: T8) -> Void) {
    let cb: (ArgumentExtractor) throws -> Void = { argumentExtractor in
        let arg1 = try argumentExtractor.getArgument(type: T1.self)
        let arg2 = try argumentExtractor.getArgument(type: T2.self)
        let arg3 = try argumentExtractor.getArgument(type: T3.self)
        let arg4 = try argumentExtractor.getArgument(type: T4.self)
        let arg5 = try argumentExtractor.getArgument(type: T5.self)
        let arg6 = try argumentExtractor.getArgument(type: T6.self)
        let arg7 = try argumentExtractor.getArgument(type: T7.self)
        let arg8 = try argumentExtractor.getArgument(type: T8.self)
        callback(arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8)
    }

    self.on(method: method, callback: cb)
}

If you control your server you can reduce the number of parameters (e.g. by creating struct). If you don't control the server then you can just create an extension method copy what you have above and add more parameters. You can also just register this callback directly on HubConnection as the .on extension methods are just syntactical sugar to doing this directly:

https://github.com/moozzyk/SignalR-Client-Swift/blob/4c35a3a6d11132d7a0022db0c4e9264b223224d2/Sources/SignalRClient/HubConnection.swift#L119-L131

Next time please open an issue in the repo.