AVCaptureMetadataOutput setMetadataObjectTypes unsupported type found

Question

I know there are someone have ask this question.But it is a sorry i donot find the answer.

dispatchQueue = dispatch_queue_create(\"myQueue\", NULL);
[capture         


        

Answer 1

you need to do like this:

        if ([_captureSession canAddOutput:self.metadataOutput]) {
        [_captureSession addOutput:self.metadataOutput];
        // 这里注意,必须先将metadataOutput 加入到session,然后才能设置metadataObjectTypes,注意顺序,不然会crash
        self.metadataOutput.metadataObjectTypes = @[AVMetadataObjectTypeQRCode];
        [self.metadataOutput setMetadataObjectsDelegate:self queue:_videoDataOutputQueue];
    }