Swift:UnsafeMutablePointer.deinitialize在附加到数组时带有负数的致命错误 [英] Swift: UnsafeMutablePointer.deinitialize fatal error with negative count when appending to array
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
):
致命错误:UnsafeMutablePointer.deinitialize with negative count
fatal error: UnsafeMutablePointer.deinitialize with negative count
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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