Question

我正在开发一款能够根据录制的视频创建框架的应用程序：

var videoFrames:[UIImage] = [UIImage]()
func loadImages(){
    let generator = AVAssetImageGenerator(asset: asset)
    generator.generateCGImagesAsynchronously(forTimes: capturedFrames, completionHandler: {requestedTime, image, actualTime, result, error in
        DispatchQueue.main.async {
            if let image = image {
                self.videoFrames.append(UIImage(cgImage: image))                }
        }
    })
}

代码适用于最多加载+/- 300张图像。还有更多，应用程序因内存问题而被终止 - 我对swift相当新 - 我该如何进一步调试它？

有没有更好的方法存储这么多图像？分裂成几个数组会解决这个问题吗？

我的目标是有效地存储数千张照片（最高可达1920x1080） - 也许您可以推荐一些更好的方法？

Answer 1

将图像写入磁盘并使用图像名称和路径维护数据库。

if let image = image {
       let uiImage = UIImage(cgImage: image)
       let fileURL = URL(fileURLWithPath: ("__file_path__" + "\(actualTime).png"))
       UIImagePNGRepresentation(uiImage).write(to: fileURL)
       //write filepath and image name to database
}

Answer 2

我添加了一些我的代码，它是我在一个从未发布的应用程序中的旧代码。它在objC中但概念仍然有效，其他代码之间的主要区别在于处理程序还考虑了捕获视频的方向，当然你必须给方向变量赋值。 / p>

__block int i = 0;

AVAssetImageGeneratorCompletionHandler handler = ^(CMTime requestedTime, CGImageRef im, CMTime actualTime, AVAssetImageGeneratorResult result, NSError *error){

        if (result == AVAssetImageGeneratorSucceeded) {

            NSMutableDictionary * metadata = @{}.mutableCopy;
            [metadata setObject:@(recordingOrientation) forKey:(NSString*)kCGImagePropertyOrientation];;
            NSString * path = [mainPath stringByAppendingPathComponent:[NSString stringWithFormat:@"Image_%.5ld.jpg",(long)i]];
            CFURLRef url = (__bridge_retained CFURLRef)[NSURL fileURLWithPath:path];
            CFMutableDictionaryRef metadataImage = (__bridge_retained CFMutableDictionaryRef) metadata;
            CGImageDestinationRef destination = CGImageDestinationCreateWithURL(url, kUTTypeJPEG, 1, NULL);
            CGImageDestinationAddImage(destination, im, metadataImage);
            if (!CGImageDestinationFinalize(destination)) {
                DLog(@"Failed to write image to %@", path);
            }
            else {
                DLog(@"Writing image to %@", path);

            }

        }
        if (result == AVAssetImageGeneratorFailed) {
            //DLog(@"Failed with error: %@ code %d", [error localizedDescription],error.code)
           DLog(@"Failed with error: %@ code %ld for CMTime requested %@ and CMTime actual %@", [error localizedDescription],(long)error.code, CFAutorelease( CMTimeCopyDescription(kCFAllocatorDefault, requestedTime)), CFAutorelease(CMTimeCopyDescription(kCFAllocatorDefault,actualTime)));
            DLog(@"Asset %@",videoAsset);
        }
        if (result == AVAssetImageGeneratorCancelled) {
            NSLog(@"Canceled");
        }
++i;
}

UIImage数组中的数百张图片 - 内存泄漏

2 个答案: