在带有 SIOSocket 的 Swift 闭包中使用 self

Question

我希望有人能帮助我。我试图将 SIOSocket 与 Swift 项目一起使用。

我正在使用 https://github.com/MegaBits/SIOSocket/issues/30 which seems to work, but i want to be able to declare a socket as a var like the Objective-C project example at https://github.com/MegaBits/WorldPin 中的示例。所以我可以在代码中的其他地方使用它来调用 emit。

我假设我不理解 Obj-C 块和 Swift 闭包基础知识以及 self 的使用或需要将 var 声明为块但不能似乎把我的头缠绕在它周围。任何帮助都感激不尽。

SIOSocket is on Github

Objective-C代码：

    @property SIOSocket *socket;

    [SIOSocket socketWithHost: @"http://localhost:3000" response: ^(SIOSocket *socket)
{
    self.socket = socket; //I Want to do this in swift

    __weak typeof(self) weakSelf = self;
    self.socket.onConnect = ^()
    {
        weakSelf.socketIsConnected = YES;
        [weakSelf mapView: weakSelf.mapView didUpdateUserLocation: weakSelf.mapView.userLocation];
    };

    [self.socket on: @"join" callback: ^(SIOParameterArray *args)
    {
        [weakSelf mapView: weakSelf.mapView didUpdateUserLocation: weakSelf.mapView.userLocation];
    }];

    [self.socket on: @"update" callback: ^(SIOParameterArray *args)
    {
        NSString *pinData = [args firstObject];

等等……

Swift代码：

private func connectToHost() {
    SIOSocket.socketWithHost(host, reconnectAutomatically: true, attemptLimit: 0, withDelay: 1, maximumDelay: 5, timeout: 20, response: {
        socket in

            self.socket = socket // This gives me a use of unresolved identifier self error

            socket.onConnect = {
                println("Connected to \(host)")
                socket.emit("add user", args: [username])
            }

            socket.on("login", callback: {(AnyObject data) -> Void in
                println(["login": data])
                socket.emit("new message", args: [message])
            })

            socket.onDisconnect = {
                println("Disconnected from \(host)")
            }
        })
    }

Answer 1

尝试将其更改为：

 SIOSocket.socketWithHost(host, reconnectAutomatically: true, attemptLimit: 0, withDelay: 1, maximumDelay: 5, timeout: 20, response: {(socket: SIOSocket) in

     self.socket = socket // This gives me a use of unresolved identifier self error

    //...
})

我把socket in改成了(socket: SIOSocket) in

Answer 2

您的代码应该可以工作，确保您拥有所有正确的类型和可选类型，通过使用 var 而不是 let 定义 socket 来确保它是一个 read-write 变量.

尝试使用 let response: (SIOSocket) -> Void = {...}.

在方法调用之前定义闭包

在带有 SIOSocket 的 Swift 闭包中使用 self

Using self in a Swift closure with SIOSocket

closures

objective-c

self

websocket

swift