类型“AVCaptureDevice”没有成员“defaultDevice”答案

【问题标题】：Type 'AVCaptureDevice' has no member 'defaultDevice'类型“AVCaptureDevice”没有成员“defaultDevice”
【发布时间】：2017-10-26 02:52:11
【问题描述】：

使用二维码阅读器。我是编程新手，所以这可能很容易解决。错误是“类型'AVCaptureDevice'没有成员'defaultDevice'”提前感谢您的帮助！

 //Creating session
    let session = AVCaptureSession()
    //Define capture device
    let captureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)

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

【问题讨论】：

检查这个：developer.apple.com/documentation/avfoundation/avcapturedevice/…

标签： swift avcapturedevice

【解决方案1】：

您使用的是旧的 Swift 2 API。行：

let captureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)

应该是：

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

【讨论】：

【解决方案2】：

这是 swift 3.0

let captureDevice = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)

在 Swift 4.1 中

AVCaptureDevice.default(for: AVMediaType.video)
{
   let input = AVCaptureDeviceInput(device: captureDevice)
   session.addInput(input)
}

希望对你有帮助

【讨论】：