Ios 检查是否调用了委托方法

我有以下连接到TCP套接字的功能（Raspberry Pi上的服务器，我通过接入点直接连接到该服务器）

当我连接到Raspberry Pi的Wifi热点时，会调用以下委托方法，我可以开始写入数据：

func stream(_ aStream: Stream, handle eventCode: Stream.Event) {
    if aStream === inputStream {
        switch eventCode {
        case Stream.Event.errorOccurred:
            print("input: ErrorOccurred: \(aStream.streamError?.localizedDescription)")
            self.Label.text = "Disconnected"
        case Stream.Event.openCompleted:
            print("input: OpenCompleted")
        case Stream.Event.hasBytesAvailable:
            print("input: HasBytesAvailable")
            // Here you can `read()` from `inputStream`

        default:
            break
        }
    }
    else if aStream === outputStream {
        switch eventCode {
        case Stream.Event.errorOccurred:
            print("output: ErrorOccurred: \(aStream.streamError?.localizedDescription)")
            self.Label.text = "Disconnected"
        case Stream.Event.openCompleted:
            print("output: OpenCompleted")
        case Stream.Event.hasSpaceAvailable:
            // print("output: HasSpaceAvailable")
            // Here you can write() to `outputStream`
            self.write(f: l)
            self.write(f: r)
        default:
            break
        }
    }
}

但当我连接到另一个WiFi时，不会调用此方法。

---

如何检测此方法未被调用，以便提醒用户他未连接，应该再次尝试连接？

如何检测？我假设print/alertcontroller/assert不起作用？编写一些代码，检测是否调用了stream（）方法，如果没有调用，我想使用警报通知用户他连接到了错误的服务器network@DanielGretzke使用断点。检测是否调用了方法很容易：放置一个打印、消息、断点，或者，在方法定义的开始处。检测何时不调用方法仍然取决于上下文：代码中调用的流方法在哪里？它是否位于具有完成和错误处理程序的块中？因为这是您可能需要添加代码的地方，而不是方法本身。能否显示实际调用委托方法的代码？在StreamDelegate中调用流（：handle:）。但我找不到在流（：handle:）方法未被调用时调用的错误处理程序

func stream(_ aStream: Stream, handle eventCode: Stream.Event) {
    if aStream === inputStream {
        switch eventCode {
        case Stream.Event.errorOccurred:
            print("input: ErrorOccurred: \(aStream.streamError?.localizedDescription)")
            self.Label.text = "Disconnected"
        case Stream.Event.openCompleted:
            print("input: OpenCompleted")
        case Stream.Event.hasBytesAvailable:
            print("input: HasBytesAvailable")
            // Here you can `read()` from `inputStream`

        default:
            break
        }
    }
    else if aStream === outputStream {
        switch eventCode {
        case Stream.Event.errorOccurred:
            print("output: ErrorOccurred: \(aStream.streamError?.localizedDescription)")
            self.Label.text = "Disconnected"
        case Stream.Event.openCompleted:
            print("output: OpenCompleted")
        case Stream.Event.hasSpaceAvailable:
            // print("output: HasSpaceAvailable")
            // Here you can write() to `outputStream`
            self.write(f: l)
            self.write(f: r)
        default:
            break
        }
    }
}