列出Swift中蓝牙设备范围内的设备 [英] List devices that are in range of Bluetooth device in Swift

问题描述

我在Xcode 6操场上有以下代码:

import Cocoa
import IOBluetooth

class BlueDelegate : IOBluetoothDeviceInquiryDelegate {
    func deviceInquiryComplete(sender: IOBluetoothDeviceInquiry, error: IOReturn, aborted: Bool) {
        aborted
        var devices = sender.foundDevices()
        for device : AnyObject in devices {
            if let thingy = device as? IOBluetoothDevice {
                thingy.getAddress()
            }
        }
    }
}

var inquiry = IOBluetoothDeviceInquiry(delegate: BlueDelegate())
inquiry.start()

在OSX下，我才刚刚开始使用蓝牙，而我目前想要的只是范围内的设备列表.

它似乎根本没有在调用我的委托方法.

我是OSX开发和Swift的新手，所以要保持谦虚. :)

解决方案

要告诉Playground您的代码在后台执行了某些操作，您必须import XCPlayground并调用XCPSetExecutionShouldContinueIndefinitely().
这将使IOBluetoothDeviceInquiry在Playground中保持活动状态，并允许它在完成后调用委托方法.

import Cocoa
import IOBluetooth
import XCPlayground

class BlueDelegate : IOBluetoothDeviceInquiryDelegate {
    func deviceInquiryComplete(sender: IOBluetoothDeviceInquiry, error: IOReturn, aborted: Bool) {
        aborted
        println("called")
        var devices = sender.foundDevices()
        for device : AnyObject in devices {
            if let thingy = device as? IOBluetoothDevice {
                thingy.getAddress()
            }
        }
    }
}

var delegate = BlueDelegate()
var inquiry = IOBluetoothDeviceInquiry(delegate: delegate)
inquiry.start()
XCPSetExecutionShouldContinueIndefinitely()

虽然上述方法可行，但我发现为需要异步代码，委托等概念的任务创建简单的传统测试项目更加容易.

I have the following code in a Xcode 6 playground:

import Cocoa
import IOBluetooth

class BlueDelegate : IOBluetoothDeviceInquiryDelegate {
    func deviceInquiryComplete(sender: IOBluetoothDeviceInquiry, error: IOReturn, aborted: Bool) {
        aborted
        var devices = sender.foundDevices()
        for device : AnyObject in devices {
            if let thingy = device as? IOBluetoothDevice {
                thingy.getAddress()
            }
        }
    }
}

var inquiry = IOBluetoothDeviceInquiry(delegate: BlueDelegate())
inquiry.start()

I'm just getting started with Bluetooth under OSX, and all I currently would like is a list of devices in range.

It doesn't seem to be calling my delegate method at all.

I'm new to OSX development and Swift, so be gentle. :)

解决方案

To tell a Playground that your code does something in the background, you have to import XCPlayground and call XCPSetExecutionShouldContinueIndefinitely().
This will keep the IOBluetoothDeviceInquiry alive in the Playground and allow it to call the delegate method when finished.

import Cocoa
import IOBluetooth
import XCPlayground

class BlueDelegate : IOBluetoothDeviceInquiryDelegate {
    func deviceInquiryComplete(sender: IOBluetoothDeviceInquiry, error: IOReturn, aborted: Bool) {
        aborted
        println("called")
        var devices = sender.foundDevices()
        for device : AnyObject in devices {
            if let thingy = device as? IOBluetoothDevice {
                thingy.getAddress()
            }
        }
    }
}

var delegate = BlueDelegate()
var inquiry = IOBluetoothDeviceInquiry(delegate: delegate)
inquiry.start()
XCPSetExecutionShouldContinueIndefinitely()

While the above approach works, I find it easier to create simple, traditional test projects for tasks that need concepts like async-code, delegation, ...

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