Initializer for conditional binding must have Optional type, not 'AVCaptureVideoPreviewLayer'

2
votes

2 errors occur after migrating to swift 4.

First error:

Initializer for conditional binding must have Optional type, not AVCaptureVideoPreviewLayer.

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Second error:

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

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How Should I correct these errors?

Thanks

2
iosiphonexcode9swift4

2 Answers

5
votes

I think you just remove if let ... condition and changes

like simple 

let cameraLayer = AVCaptureVideoPreviewLayer(session: self.cameraSession)

And same for second error means you should use directly videoDevices no need to use if let... condition.

1
votes

The initializer of AVCaptureVideoPreviewLayer doesn't return an optional. Thus, the if condition is always true, and the if statement ist useless. You should remove the if and it's braces.