这个答案对我有用但是它需要一些修改，例如创建桥接头以导入某些特定的IOKit部件。
首先，将IOKit.framework添加到您的项目中（在“链接的框架和库”中单击“ +”）。
然后创建一个新的空“ .m”文件，无论其名称如何。然后，Xpre将询问是否应创建“桥接标头”。说是。
忽略“ .m”文件。在Xpre刚刚创建的新的“ YOURAPPNAME-Bridging-Header.h”文件中，添加以下行：
#include <IOKit/IOKitLib.h>#include <IOKit/usb/IOUSBLib.h>#include <IOKit/hid/IOHIDKeys.h>
现在，您可以使用链接答案中的代码。这是一个简化的版本：
class USBDetector { class func monitorUSBEvent() { var portIterator: io_iterator_t = 0 let matchingDict = IOServiceMatching(kIOUSBDeviceClassName) let gNotifyPort: IonotificationPortRef = IonotificationPortCreate(kIOMasterPortDefault) let runLoopSource: Unmanaged<CFRunLoopSource>! = IonotificationPortGetRunLoopSource(gNotifyPort) let gRunLoop: CFRunLoop! = CFRunLoopGetCurrent() CFRunLoopAddSource(gRunLoop, runLoopSource.takeRetainedValue(), kCFRunLoopDefaultMode) let observer = UnsafeMutablePointer<Void>(unsafeAddressOf(self)) _ = IOServiceAddMatchingNotification(gNotifyPort, kIOMatchedNotification, matchingDict, deviceAdded, observer, &portIterator) deviceAdded(nil, iterator: portIterator) _ = IOServiceAddMatchingNotification(gNotifyPort, kIOTerminatedNotification, matchingDict, deviceRemoved, observer, &portIterator) deviceRemoved(nil, iterator: portIterator) }}func deviceAdded(refCon: UnsafeMutablePointer<Void>, iterator: io_iterator_t) { var kr: kern_return_t = KERN_FAILURE while case let usbDevice = IOIteratorNext(iterator) where usbDevice != 0 { let deviceNameAsCFString = UnsafeMutablePointer<io_name_t>.alloc(1) defer {deviceNameAsCFString.dealloc(1)} kr = IORegistryEntryGetName(usbDevice, UnsafeMutablePointer(deviceNameAsCFString)) if kr != KERN_SUCCESS { deviceNameAsCFString.memory.0 = 0 } let deviceName = String.fromCString(UnsafePointer(deviceNameAsCFString)) print("Active device: (deviceName!)") IOObjectRelease(usbDevice) }}func deviceRemoved(refCon: UnsafeMutablePointer<Void>, iterator: io_iterator_t) { // ...}注意：
deviceAdded并且
deviceRemoved必须是函数（不是方法）。
要使用此代码，只需启动观察器：
USBDetector.monitorUSBEvent()
这将列出当前已插入的设备，并且在每个新的USB设备插入/拔出事件中，它将打印设备名称。
