ios - "Message from debugger: Terminated due to memory issue "图片

Question

我正在尝试从相册中获取图像，此代码从特定相册中获取所有图像，但在滚动应用程序时将关闭并给出错误“来自调试器的消息:由于内存问题而终止”。请检查代码并找到错误。(我想在没有内存警告的情况下获取所有相册和图像，如“Lalalab”应用程序)。

 func fatchImagesfromAlbum() {
        DispatchQueue.global(qos: .background).async {
        self.photoAssets = self.fetchResult as! PHFetchResult<AnyObject>

        let fetchOptions = PHFetchOptions()
        fetchOptions.predicate = NSPredicate(format: "mediaType = %d", PHAssetMediaType.image.rawValue)


        self.photoAssets = PHAsset.fetchAssets(in: self.assetCollection, options: fetchOptions) as! PHFetchResult<AnyObject>

        for i in 0..<self.photoAssets.count{
                let asset = self.photoAssets.object(at: i)
                let imageSize = CGSize(width: asset.pixelWidth,
                                       height: asset.pixelHeight)

                let options = PHImageRequestOptions()
                options.deliveryMode = .fastFormat
                options.isSynchronous = true

                self.imageManager.requestImage(for: asset as! PHAsset, targetSize: imageSize, contentMode: .aspectFill, options: options, resultHandler: { (image, info) -> Void in


                    self.images.append(image!)
                    let url:NSURL = info!["PHImageFileURLKey"] as! NSURL
                    let urlString: String = url.path!
                    let theFileName = (urlString as NSString).lastPathComponent
                    print("file name\(info!)")
                    self.imageName.append("\(theFileName)")
                    self.imagePath.append("\(urlString)")

                })

                print(self.imagePath)
                print(self.imageName)
                DispatchQueue.main.async
                    {
                        [unowned self] in

                        self.collectionView.reloadData()
                }


        }
    }
    PHPhotoLibrary.shared().register(self)

    if fetchResult == nil {
        let allPhotosOptions = PHFetchOptions()
        allPhotosOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: true)]
        fetchResult = PHAsset.fetchAssets(with: allPhotosOptions)
    }


    }

Answer 1

遇到这样的问题；它与制作 weak 或 unowned 引用无关。当您的 Objective-C 代码或使用 Cocoa 类创建对象时，您应该做的是处理 autoreleasepool ，尝试在 autoreleasepool 中调用您的方法:

autoreleasepool {
    fatchImagesfromAlbum()
}

_{应该是 fetchImagesfromAlbum 而不是 fatchImagesfromAlbum 吗？}

引自 Advanced Memory Management Programming Guide :

Autorelease pool blocks provide a mechanism whereby you can relinquish ownership of an object, but avoid the possibility of it being deallocated immediately (such as when you return an object from a method). Typically, you don’t need to create your own autorelease pool blocks, but there are some situations in which either you must or it is beneficial to do so.

但是，应该不需要在autoreleasepool中执行整个方法，可能内存问题的原因是迭代地执行 fetchAssets 或 requestImage(在 for 循环内)。

引用:Is it necessary to use autoreleasepool in a Swift program?