Swift4.0坑,二维码扫描

从Swift3+ 到Swift4二维码扫描遇到一个坑,Mark一下

output.metadataObjectTypes = [AVMetadataObject.ObjectType.qr]

代理方法
Swift3.0+

func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!)

Swift4.0

func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection)

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