swift - Swift AVCaptureDevice中的可选类型

let captureDeviceInput: AVCaptureDeviceInput?

    do {
        captureDeviceInput = try AVCaptureDeviceInput(device: device)
        if session.canAddInput(captureDeviceInput) {
            session.addInput(captureDeviceInput)
        }

    }

获取“可选类型'avCaptureDeviceImput'的值？”的编译错误未打开”。有办法解决这个问题吗？

最佳答案

有办法解决这个问题吗？
对。属性是可选类型。你得把它打开。

captureDeviceInput = try AVCaptureDeviceInput(device: device)
if let captureDeviceInput = captureDeviceInput
{
    if session.canAddInput(captureDeviceInput) {
            session.addInput(captureDeviceInput)
    }
}
else
{
    // Do something for a nil result (or nothing, if reasonable)
}

关于swift - Swift AVCaptureDevice中的可选类型，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/47535139/