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swiftoptional-binding

Swift Initializer for conditional binding must have Optional type, not '[AVCaptureDevice]'

I have this following code in my swift project

if let availabeDevices = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInMicrophone,
.builtInWideAngleCamera], mediaType: AVMediaType.video, position: .back).devices {

            captureDevice = availabeDevices.first
        }

When i run this code it gives me an error on if line that reads:

Initializer for conditional binding must have Optional type, not '[AVCaptureDevice]'

I tried adding ? after .devices,but that gave this error:

Cannot use optional chaining on non-optional value of type '[AVCaptureDevice]'

What do i do?

Solution

  • Use below lines. 

    if let captureDevice = AVCaptureDevice.DiscoverySession(deviceTypes: [.builtInMicrophone, .builtInWideAngleCamera], 
mediaType: AVMediaType.video, 
position: .back).devices.first {
            self.captureDevice = captureDevice
        }