ios - Swift 4 中的 UIImagePickerController 内存泄漏 Xcode 9

Question

在我的应用程序中，当我使用 UIImagePickerController 时，我发现内存泄漏，我以为这是我的应用程序，但在寻找解决方案时，我找到了一个 Apple 的示例，我还发现这个示例有同样的内存泄漏。

您可以在以下 URL 中找到示例。

https://developer.apple.com/library/content/samplecode/PhotoPicker/Introduction/Intro.html#//apple_ref/doc/uid/DTS40010196

根据 UIImagePickerController 文档:

https://developer.apple.com/documentation/uikit/uiimagepickercontroller

在第 5 点中，您说您必须使用委托(delegate)对象关闭图像选择器，在 Apple 的示例中，UIImagePickerDelegate 正在执行关闭操作。

问题是当您选择图像并使用它时，内存泄漏会浪费大约 21 MB 的内存。

没有内存泄漏的已用内存

内存泄漏的已用内存

内存泄漏

这是呈现 UIImagePickerController 的代码:

@IBAction func showImagePickerForPhotoPicker(_ sender: UIBarButtonItem) {
    showImagePicker(sourceType: UIImagePickerControllerSourceType.photoLibrary, button: sender)
}

fileprivate func showImagePicker(sourceType: UIImagePickerControllerSourceType, button: UIBarButtonItem) {
    // If the image contains multiple frames, stop animating.
    if (imageView?.isAnimating)! {
        imageView?.stopAnimating()
    }
    if capturedImages.count > 0 {
        capturedImages.removeAll()
    }

    imagePickerController.sourceType = sourceType
    imagePickerController.modalPresentationStyle =
        (sourceType == UIImagePickerControllerSourceType.camera) ?
            UIModalPresentationStyle.fullScreen : UIModalPresentationStyle.popover

    let presentationController = imagePickerController.popoverPresentationController
    presentationController?.barButtonItem = button   // Display popover from the UIBarButtonItem as an anchor.
    presentationController?.permittedArrowDirections = UIPopoverArrowDirection.any

    if sourceType == UIImagePickerControllerSourceType.camera {
        // The user wants to use the camera interface. Set up our custom overlay view for the camera.
        imagePickerController.showsCameraControls = false

        // Apply our overlay view containing the toolar to take pictures in various ways.
        overlayView?.frame = (imagePickerController.cameraOverlayView?.frame)!
        imagePickerController.cameraOverlayView = overlayView
    }

    present(imagePickerController, animated: true, completion: {
        // Done presenting.
    })
}

这是委托(delegate)中关闭 UIImagePickerController 的代码:

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    let image = info[UIImagePickerControllerOriginalImage]
    capturedImages.append(image as! UIImage)

    if !cameraTimer.isValid {
        // Timer is done firing so Finish up until the user stops the timer from taking photos.
        finishAndUpdate()
    } else {
        dismiss(animated: true, completion: nil)
    }
}

func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
    dismiss(animated: true, completion: {
        // Done cancel dismiss of image picker.
    })
}

fileprivate func finishAndUpdate() {
    dismiss(animated: true, completion: { [weak self] in
        guard let `self` = self else {
            return
        }

        if `self`.capturedImages.count > 0 {
            if self.capturedImages.count == 1 {
                // Camera took a single picture.
                `self`.imageView?.image = `self`.capturedImages[0]
            } else {
                // Camera took multiple pictures; use the list of images for animation.
                `self`.imageView?.animationImages = `self`.capturedImages
                `self`.imageView?.animationDuration = 5    // Show each captured photo for 5 seconds.
                `self`.imageView?.animationRepeatCount = 0   // Animate forever (show all photos).
                `self`.imageView?.startAnimating()
            }

            // To be ready to start again, clear the captured images array.
            `self`.capturedImages.removeAll()
        }
    })
}

我仍在寻找解决方案，我们将不胜感激。

Answer 1

我遇到了同样的问题。很多其他人也是如此。追溯到 2008 年。非常疯狂。

• http://iphonedevsdk.com/forum/iphone-sdk-development/3816-uiimagepickercontroller-memory-issues.html
• UIImagePickerController leaking memory after launch and during taking a picture. Makes app crash after taking more than a 100 pictures
• UIImagePickerController Memory Leak

不幸的是，我能找到的最佳答案是使用单例，这很糟糕。 [IE。有意保留 UIImagePickerController 的一个实例，这样您每次想要选择图像时都可以访问它。] 这是其他人的建议。

此外，我只花了一个小时用使用单例的代码写了这个答案，我就是无法避免内存泄漏 [虽然我认为我有一秒钟]。也许我只是做错了 - 请随意尝试。但我不会发布功能失调的代码作为答案。

最佳答案 [这就是我解决问题的方法] 是使用第三方 pod/库。我使用了 ImagePicker，它快速、快速、免费、漂亮，而且没有内存泄漏! [麻省理工学院许可证]

在这里查看: https://github.com/hyperoslo/ImagePicker