Question

我遇到内存泄漏。根据探查器（带有分配），它发生在CIContext的createCGImage函数中。我一直在寻找关于stackoverflow的类似问题，但是我还没有找到解决方案。我试图将其包装在autoreleasepool中，但是仍然存在内存泄漏。

如何在不泄漏swift4中内存的情况下从CIContext创建CGImage？

func session(_ session: ARSession, didUpdate frame: ARFrame) {
    // Only run when currentFrame is finished
    guard self.currentPixelBuffer == nil else { return } // , case .normal = frame.camera.trackingState
    self.currentPixelBuffer = frame.capturedImage

    guard let currentPixelBuffer = self.currentPixelBuffer else {return }

    let ciImage = CIImage(cvPixelBuffer: currentPixelBuffer).oriented(CGImagePropertyOrientation.init(UIDevice.current.orientation))

    let cgImage: CGImage? = self.context?.createCGImage(ciImage, from: ciImage.extent)
    // var cgImage: CGImage?
    // autoreleasepool { [weak self] () -> () in
    //     cgImage = self?.context?.createCGImage(ciImage, from: ciImage.extent)
    // }

    guard let unwrappedCgImage = cgImage else { return }
    let uiImage = UIImage.init(cgImage: unwrappedCgImage)

    let visionImage = VisionImage(image: uiImage)

    self.backgroundQueue.async {
        self.textDetector?.detect(in: visionImage, completion: { [weak self] (features, error) in
        ...

P.s。这是我的上下文声明：

var context: CIContext? = CIContext.init(options: nil)

Answer 1

因此，问题实际上出在“ self.textDetector？.detect（in：visionImage ...）”调用中。它对visioningImage保持了强烈引用。

我无法解决该问题，但是我能够通过让VisionImage考虑到旋转而不是自己旋转图像来解决该问题。...

我最终得到了这个工作代码：

func session(_ session: ARSession, didUpdate frame: ARFrame) {
    // Only run when currentFrame is finished
    guard self.currentPixelBuffer == nil else { return } // , case .normal = frame.camera.trackingState
    self.currentPixelBuffer = frame.capturedImage

    guard let currentPixelBuffer = self.currentPixelBuffer else { return }
    let visionImage = VisionImage(buffer: self.getCMSampleBuffer(pixelBuffer: currentPixelBuffer))

    let metadata = VisionImageMetadata()
    switch UIApplication.shared.statusBarOrientation {
    case .landscapeLeft:
        metadata.orientation = .bottomRight
    case .landscapeRight:
        metadata.orientation = .topLeft
    case .portrait:
        metadata.orientation = .rightTop
    case .portraitUpsideDown:
        metadata.orientation = .leftBottom
    default:
        metadata.orientation = .topLeft
    }

    visionImage.metadata = metadata

    self.backgroundQueue.async {
        self.textDetector?.detect(in: visionImage, completion: { [weak self] (features, error) in

CIContext createCGImage内存泄漏？

1 个答案: