在 iOS 15+ 中检测所有相机和麦克风

Question

任何人都知道是否可以使用 AVCaptureDevice.DiscoverySession 来检测任何连接的摄像头或麦克风，而无需遍历每种不同的类型、检查它们并将它们附加到数组中？

例如，我用来检测连接的摄像头或麦克风的方法是使用这样的 for 循环，但现在这种方法已被弃用，我很好奇他们的新 AVCaptureDevice.DiscoverySession 方法是否有解决方案.

//旧的方式是这样的：

for eachDevice in AVCaptureDevice.devices() {print(eachDevice)}

//新方法是这样的：

let discoverFrontFacingWideAngleCamerasConnected = AVCaptureDevice.DiscoverySession.init(deviceTypes: [.builtInWideAngleCamera], mediaType: .video, position: .front)

for device in discoverFrontFacingWideAngleCamerasConnected.devices {
    print("there is a front facing wide angle camera named -> \(device.localizedName)")
} 

//但是我该怎么办？？

let allCamerasAndMicrophonesConnected = AVCaptureDevice.DiscoverySession.init(ANY CAMERAS OR MICS)

Answer 1

解决方案

以下是在 iOS 上使用 Swift 获取相机和麦克风的方法：

public func getListOfCamerasOnTheDevice() -> [AnyHashable] {
        let session = AVCaptureDevice.DiscoverySession(
            deviceTypes: [
                .builtInWideAngleCamera,
                .builtInTelephotoCamera,
                .builtInMicrophone
            ],
            mediaType: .video,
            position: .unspecified)

        let captureDevices = session.devices
        var names: [AnyHashable] = []
        for device in captureDevices {
            guard let device = device as? AVCaptureDevice else {
                continue
            }
            
            names.append(device.localizedName)
        }
        
        return names
    }
    
    public func getListOfMicrophonesOnTheDevice() -> [AnyHashable] {
        let session = AVCaptureDevice.DiscoverySession(
            deviceTypes: [
                .builtInMicrophone
            ],
            mediaType: .audio,
            position: .unspecified)

        let captureDevices = session.devices
        var names: [AnyHashable] = []
        
        for device in captureDevices {
            guard let device = device as? AVCaptureDevice else {
                continue
            }
            
            names.append(device.localizedName)
        }
        
        return names
    }

iPhone 12 Pro Max 上的输出

• getListOfCamerasOnTheDevice() - [AnyHashable("Back Camera"), AnyHashable("Front Camera"), AnyHashable("Back Telephoto Camera")]

• getListOfMicrophonesOnTheDevice() - [AnyHashable("iPhone Microphone")]

所有选项

当然，还有更多的 AVCaptureDevice 设备类型。这是来自the official Apple documentation 的当前列表。

相机

static let builtInWideAngleCamera: AVCaptureDevice.DeviceType // A built-in wide-angle camera.

static let builtInUltraWideCamera: AVCaptureDevice.DeviceType // A built-in camera with a shorter focal length than that of the wide-angle camera.

static let builtInTelephotoCamera: AVCaptureDevice.DeviceType // A built-in camera device with a longer focal length than the wide-angle camera.

static let builtInDualCamera: AVCaptureDevice.DeviceType // A device that consists of a wide-angle and telephoto camera.

static let builtInDualWideCamera: AVCaptureDevice.DeviceType // A device that consists of two cameras of fixed focal length, one ultrawide angle and one wide angle.

static let builtInTripleCamera: AVCaptureDevice.DeviceType // A device that consists of three cameras of fixed focal length, one ultrawide angle, one wide angle, and one telephoto.

static let builtInDuoCamera: AVCaptureDevice.DeviceType // A built-in dual camera device. (Deprecated)

麦克风

static let builtInMicrophone: AVCaptureDevice.DeviceType // A built-in microphone.

外部设备

static let externalUnknown: AVCaptureDevice.DeviceType // An unknown external device type.

桌面视图

static let deskViewCamera: AVCaptureDevice.DeviceType // A virtual overhead camera that captures a user’s desk.

深度感应（测试版）

static let builtInLiDARDepthCamera: AVCaptureDevice.DeviceType // A device that consists of two cameras, one LiDAR and one YUV.

static let builtInTrueDepthCamera: AVCaptureDevice.DeviceType // A device that consists of two cameras, one Infrared and one YUV.