2

我在使用 PBJVision 时遇到了一些问题。

我将它集成到一个 Swift 项目中，当我尝试设置预览层的框架时，它会导致框架不一致： img_1678

我有这个代码：

var _previewLayer: AVCaptureVideoPreviewLayer = PBJVision.sharedInstance().previewLayer
@IBOutlet weak var previewView: UIView! // this is the white view in the back

let bounds = self.previewView.layer.bounds
_previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
_previewLayer.bounds = bounds
_previewLayer.position = CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds))
previewView.layer.addSublayer(_previewLayer)
4

2 回答 2

4

您是否尝试过在布局子视图_previewLayer时调整框架的大小？previewView

您的子类UIView，为您previewView设置一个属性AVCaptureVideoPreviewLayer，并将其框架设置为与您的视图边界相匹配：

class PreviewView: UIView {

    let previewLayer: AVCaptureVideoPreviewLayer?

    override func layoutSubviews() {
        self.previewLayer?.frame = self.bounds;
    }
}
于 2016-02-03T04:24:21.450 回答
0

我遇到过同样的问题。

我尝试了@rkyr 推荐（在viewDidLayoutSubviews方法中设置框架），但没有成功。我也想在不添加子类的情况下修复它。

我能够通过 2 个更改来修复它： - 确保 previewLayer 被定义为AVCaptureVideoPreviewLayer(subclass of CALayer) 而不是CALayer，这就是我的情况

var previewLayer: AVCaptureVideoPreviewLayer? // :CALayer

  • 确保设置了图层的框架，并在设置了图层会话的所有设置后将其添加到视图中：此代码有效：

    captureSession = AVCaptureSession()
let captureDevice = AVCaptureDevice.default(for: AVMediaType.video)
do {
    let input = try AVCaptureDeviceInput(device: captureDevice!)
    captureSession?.addInput(input)
} catch {
    onErrorCloseAndReturn(error: error)
}
let dataOutput = AVCaptureVideoDataOutput()
dataOutput.videoSettings = [((kCVPixelBufferPixelFormatTypeKey as NSString) as String): NSNumber(value: kCVPixelFormatType_32BGRA)]
dataOutput.alwaysDiscardsLateVideoFrames = true
if captureSession!.canAddOutput(dataOutput) {
    captureSession?.addOutput(dataOutput)
}
captureSession?.commitConfiguration()
let queue = DispatchQueue(label: "captureQueue")
dataOutput.setSampleBufferDelegate(self, queue: queue)
captureSession?.startRunning()

previewLayer = AVCaptureVideoPreviewLayer(session: captureSession!)
previewLayer?.frame = self.view.layer.bounds
self.view.layer.addSublayer(previewLayer!)

我锄头它有帮助... e

于 2018-05-31T16:15:31.323 回答