Swift：UnsafeMutablePointer.deinitialize在附加到数组时带有负数的致命错误

问题描述

以下代码会产生此错误（附加到导出器）：

The code below generates this error (appending to exporters):

    var exporters = [AVAssetExportSession]()

    let exporter = AVAssetExportSession(asset: mainComposition, presetName: AVAssetExportPresetHighestQuality)!
    exporter.videoComposition = videoComposition
    exporter.outputFileType = AVFileTypeMPEG4
    exporter.outputURL = exportURL
    exporter.shouldOptimizeForNetworkUse = true
    exporters.append(exporter)

StackOverflow上关于 UnsafeMutablePointer.deinitialize 的其他帖子不会流失这个问题很少发生，这不会持续发生。

The other posts on StackOverflow regarding UnsafeMutablePointer.deinitialize do not shed much light on the issue, which doesn't happen consistently.

任何想法？

推荐答案

我有类似的错误，问题是由多个线程同时修改数组引起的。在串行调度队列中包装追加调用为我解决了这个问题。

I had a similar error, the issue was caused by multiple threads modifying the array at the same time. Wrapping the append calls in a serial dispatch queue solved it for me.

    let serialQueue = DispatchQueue(label: "myqueue")

    serialQueue.sync {
        exporters.append(exporter)
    }

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