如何使用手机默认相机

Question

我正在尝试在我的应用程序中使用我的 iPhone 相机。我使用 xcode 11 和 swift 5

错误发生在以下行中：

let usecamera = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)

错误信息：

Type 'AVCaptureDevice' has no member 'defaultDevice'

我尝试了下面的代码，但它不起作用：

 let captureDevice = AVCaptureDevice.default(.builtInDualCamera,
    for: AVMediaType.video,
    position: .back)

    do {
        let input = try AVCaptureDeviceInput(device: captureDevice)
        session.addInput(input)

    }

但收到错误消息：

Value of optional type 'AVCaptureDevice?' must be unwrapped to a value of type 'AVCaptureDevice'

Answer 1

错误 1 修复

您需要将行更新到最新 swift

let usecamera = AVCaptureDevice.default(for: .video)

错误 2 修复

如错误所述 captureDevice 是可选的，您需要使用 captureDevice! 或安全地 guard ，因此替换

let captureDevice = AVCaptureDevice.default(.builtInDualCamera,
for: AVMediaType.video,
position: .back)

和

guard  let captureDevice = AVCaptureDevice.default(.builtInDualCamera,
for: AVMediaType.video,
position: .back) else { return }

如何使用手机默认相机

how to use the phones defualt camera

xcode

swift

swift5