Swift：nskeyedunarchiver 失败并以“NSInvalidArgumentException”终止应用程序，原因：“-[__NSCFData count]

编程问答 2022-04-29

问题描述

NSKeyedUnarchiver.UnarchivedArrayOfObjects() 使用“NSinvalidargumentexception”终止应用程序，原因：“-[__NSCFData count]

  1. track 符合 NSManagedobject 然而，decodedTrackLocation 被声明为 @Published public var decodedTrackLocation: [CLLocation] = []，因为它不是持久的，而是应该在内存中。

  2. 以下代码适用于某些“保存”，但有时会引发异常，我不知道该怎么做。

  3. 它在 'if let final =' 崩溃并抛出这个异常：

2021-06-01 17:42:28.052628+0200 GeoTrack[12300:1124356] -[__NSCFData count]: unrecognized selector sent to instance 0x17a61df50
2021-06-01 17:42:28.061055+0200 GeoTrack[12300:1124356] *** Terminating app due to uncaught exception 'NSinvalidargumentexception',reason: '-[__NSCFData count]: unrecognized selector sent to instance 0x17a61df50'
*** First throw call stack:
(0x1a9e27298 0x1bdb81480 0x1a9d362a8 0x1a9e298f4 0x1a9e2b89c 0x1ad67168c 0x1ad707e24 0x1026e5988 0x102704310 0x1b0345f94 0x1b0345fb0 0x1b0345f94 0x1b0737d74 0x1b0733e68 0x1b02225f4 0x1b088b190 0x1031f7ae8 0x102ee7ae8 0x102ee932c 0x102ef776c 0x1a9da62e0 0x1a9da0740 0x1a9d9f818 0x1c04a5570 0x1ac6cb0e8 0x1ac6d0664 0x1025696dc 0x1a9a7e140)
libc++abi: terminating with uncaught exception of type NSException
*** Terminating app due to uncaught exception 'NSinvalidargumentexception',reason: '-[__NSCFData count]: unrecognized selector sent to instance 0x17a61df50'
terminating with uncaught exception of type NSException
  1. NSKeyedUnarchiver 失败的原因是因为我做了一些愚蠢的事情，我存储了错误的数据。我无法理解的是为什么此代码所在的 do-try-catch 块不起作用/无法捕获。 任何帮助将不胜感激。

问题中的代码：

do{
   let out = try Data(referencing: NSData(data: track.trackLocation).decompressed(using: .lzma))
   let archiver = try NSKeyedUnarchiver(forReadingFrom: out)
   archiver.requiresSecureCoding = true
   archiver.decodingFailurePolicy = .setErrorAndReturn
   if let final = archiver.decodeArrayOfObjects(ofClass: CLLocation.self,forKey: NSKeyedArchiveRootObjectKey){
      track.decodedTrackLocation = final
   }
} catch {
   print(error)
}

do{
   let out = try Data(referencing: NSData(data: track.trackLocation).decompressed(using: .lzma))
   if let final = try NSKeyedUnarchiver.unarchivedArrayOfObjects(ofClass: CLLocation.self,from: out){
       track.decodedTrackLocation = final
   }
} catch {
   print(error)
}

解决方法

因为它不是一个错误被抛出（抛出），它是一个 NSInvalidArgumentException，一个 NSException，在 Objective-C 上。你可以找找 :) - Larme

我学到了新东西！

invalidargumentexceptioniosiosnskeyedunarchiverswiftswiftswiftswift