未在QR扫描仪的swift 4中调用AVCaptureMetadataOutputObjectsDelegate [英] AVCaptureMetadataOutputObjectsDelegate not called in swift 4 for QR scanner

问题描述

我正在iOS上的QR码扫描仪应用程序上工作，在那里我在委托方法 captureOutput:didOutputMetadataObjects:fromConnection:上获取输出 AVCaptureOutput .

I was working on QR code scanner app on iOS where i was getting output AVCaptureOutput on the delegate method captureOutput:didOutputMetadataObjects:fromConnection:.

它在swift 3上运行良好.在我更新到xcode 9和swift 4之后，它停止了工作.

It was working perfectly on swift 3. After I've updated to xcode 9 and swift 4, it stopped working.

推荐答案

好的，我发现了一个更新

Okay I've found an update here.

发现 AVCaptureMetadataOutputObjectsDelegate 方法已更改

来自

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

到

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

更改此委托方法后，现在可以正常工作了.

After changing this delegate method, its working good now.

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