macOS开发：如何监听iOS设备接入或断开Mac的通知

实现方案 #

你可以通过IOKit框架监听USB设备的插拔事件，过滤Apple Vendor ID即可实现iPhone、iPad的接入/断开检测，具体实现步骤如下：

1. 项目配置 #

引入IOKit.framework到项目中，若应用开启了沙盒，需要在签名与权限配置中开启USB访问权限。

2. 导入依赖头文件 #

#import <IOKit/IOKitLib.h>
#import <IOKit/usb/IOUSBLib.h>

3. 核心实现代码 #

先声明全局变量存储监听上下文：

// 全局通知端口
IONotificationPortRef gNotifyPort;
// 设备接入迭代器
io_iterator_t gAddedIter;
// 设备断开迭代器
io_iterator_t gRemovedIter;

实现设备监听启动方法：

- (void)startMonitoringIOSDevices {
    // 创建USB设备匹配字典
    CFMutableDictionaryRef matchDict = IOServiceMatching(kIOUSBDeviceClassName);
    if (!matchDict) return;
    
    // 过滤Apple设备的固定Vendor ID: 0x05AC
    int appleVID = 0x05AC;
    CFNumberRef vidRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &appleVID);
    CFDictionarySetValue(matchDict, CFSTR(kUSBVendorID), vidRef);
    CFRelease(vidRef);
    
    // 初始化通知端口并加入当前RunLoop
    gNotifyPort = IONotificationPortCreate(kIOMasterPortDefault);
    CFRunLoopAddSource(CFRunLoopGetCurrent(), IONotificationPortGetRunLoopSource(gNotifyPort), kCFRunLoopDefaultMode);
    
    // 注册设备接入回调
    IOServiceAddMatchingNotification(gNotifyPort, kIOFirstMatchNotification, matchDict, DeviceAddedCallback, (__bridge void *)self, &gAddedIter);
    // 手动调用一次处理已连接的设备
    DeviceAddedCallback((__bridge void *)self, gAddedIter);
    
    // 注册设备断开回调，需重新创建匹配字典
    CFMutableDictionaryRef removeMatchDict = IOServiceMatching(kIOUSBDeviceClassName);
    CFNumberRef removeVidRef = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &appleVID);
    CFDictionarySetValue(removeMatchDict, CFSTR(kUSBVendorID), removeVidRef);
    CFRelease(removeVidRef);
    
    IOServiceAddMatchingNotification(gNotifyPort, kIOTerminatedNotification, removeMatchDict, DeviceRemovedCallback, (__bridge void *)self, &gRemovedIter);
    DeviceRemovedCallback((__bridge void *)self, gRemovedIter);
}

实现设备插拔回调函数：

// 设备接入回调
void DeviceAddedCallback(void *refCon, io_iterator_t iterator) {
    io_service_t device;
    while ((device = IOIteratorNext(iterator))) {
        // 读取设备产品名判断是否为iPhone/iPad
        CFStringRef productNameRef = IORegistryEntryCreateCFProperty(device, CFSTR(kUSBProductString), kCFAllocatorDefault, 0);
        if (productNameRef) {
            NSString *productName = (__bridge_transfer NSString *)productNameRef;
            if ([productName containsString:@"iPhone"] || [productName containsString:@"iPad"]) {
                // 切换到主线程更新UI
                dispatch_async(dispatch_get_main_queue(), ^{
                    // 这里调用你自己的NSView提示展示逻辑
                    NSLog(@"设备接入: %@", productName);
                });
            }
        }
        IOObjectRelease(device);
    }
}

// 设备断开回调
void DeviceRemovedCallback(void *refCon, io_iterator_t iterator) {
    io_service_t device;
    while ((device = IOIteratorNext(iterator))) {
        CFStringRef productNameRef = IORegistryEntryCreateCFProperty(device, CFSTR(kUSBProductString), kCFAllocatorDefault, 0);
        if (productNameRef) {
            NSString *productName = (__bridge_transfer NSString *)productNameRef;
            if ([productName containsString:@"iPhone"] || [productName containsString:@"iPad"]) {
                dispatch_async(dispatch_get_main_queue(), ^{
                    // 这里调用你自己的NSView提示移除逻辑
                    NSLog(@"设备断开: %@", productName);
                });
            }
        }
        IOObjectRelease(device);
    }
}

实现资源释放方法，避免内存泄漏：

- (void)stopMonitoringIOSDevices {
    if (gAddedIter) {
        IOObjectRelease(gAddedIter);
        gAddedIter = 0;
    }
    if (gRemovedIter) {
        IOObjectRelease(gRemovedIter);
        gRemovedIter = 0;
    }
    if (gNotifyPort) {
        IONotificationPortDestroy(gNotifyPort);
        gNotifyPort = NULL;
    }
}

注意事项 #

• 所有UI更新操作必须切换到主线程执行，否则会出现界面异常或崩溃
• 如果需要更精准的过滤，避免把其他Apple USB外设（比如妙控键盘、鼠标）纳入检测，可以在回调中额外匹配设备Product ID，接入对应设备打印PID后自行添加过滤规则即可
• 若应用使用沙盒机制，必须开启USB访问权限，否则无法获取USB设备信息

内容的提问来源于stack exchange，提问作者Edward Chou