NSKeyedArchiver & NSKeyedUnarchiver / Swift 3.0

Question

我正在使用 NSKeyedArchiver 和 NSKeyedUnarchiver 将一些复杂数据存储在 Core-Data 中，稍后在我的应用程序中检索它。到目前为止，它一直运行良好，但在迁移之后，Swift 3.0 似乎对我的代码不满意。

我的代码很早就有这个：

        var firstArray = [Int](), secondArray = [CGFloat]()
        .......
        // stores some values in firstArray and also in secondArray.
         .......

存储数据的代码如下所示：

        let masterArray = [firstArray, secondArray] as [Any]
        let dataForApp:NSData = NSKeyedArchiver.archivedData(withRootObject: masterArray) as NSData
        entityFieldsDico = ["dataForAppArray":dataForApp]
        // Use entityFieldsDico to save dataForApp in Core-Data under the key "dataForAppArray".

检索数据的代码如下所示：

    if let archiveData = dbRecord.value(forKey: "dataForAppArray") {
        let archiveArray = NSKeyedUnarchiver.unarchiveObject(with: archiveData as! Data)
        firstArray = (archiveArray as! Array)[0] as [Int]
        secondArray = (archiveArray as! Array)[1] as [CGFloat]
    }

问题出现在检索数据的代码中。它只是在构建时崩溃。

如果我注释掉这两行：

        //firstArray = (archiveArray as! Array)[0] as [Int]
        //secondArray = (archiveArray as! Array)[1] as [CGFloat]

除了 firstArray & 中的数据（显然）不可用之外，该程序可以运行。

如果我不将它们注释掉，我就会崩溃，一条很长的消息以如下所示的内容结尾。（我添加了一些...（点）来缩短消息。）

.............
0  swift                    0x000000010d71fa3d PrintStackTraceSignalHandler(void*) + 45
1  swift                    0x000000010d71f466 SignalHandler(int) + 470
2  libsystem_platform.dylib 0x00007fffa0c5a52a _sigtramp + 26
3  libsystem_platform.dylib 0x0000000000000003 _sigtramp + 1597659891
4  swift                    0x000000010b25b4e3 swift::constraints::ConstraintGraphScope::~ConstraintGraphScope() + 899
5  swift                    0x000000010b2f45f4 swift::constraints::ConstraintSystem::solveSimplified(llvm::SmallVectorImpl<swift::constraints::Solution>&, swift::FreeTypeVariableBinding) + 24868
...........
Objects-normal/arm64/UP_ViewController.dia -emit-dependencies-path /Users/me/Library/Developer/Xcode/DerivedData/TheApp-dszaazmmftlmwbicuwcwaplkjdfs/Build/Intermediates/TheApp.build/Debug-iphoneos/TheApp.build/Objects-normal/arm64/UP_ViewController.d -emit-reference-dependencies-path /Users/me/Library/Developer/Xcode/DerivedData/TheApp-dszaazmmftlmwbicuwcwaplkjdfs/Build/Intermediates/TheApp.build/Debug-iphoneos/TheApp.build/Objects-normal/arm64/UP_ViewController.swiftdeps -o /Users/me/Library/Developer/Xcode/DerivedData/TheApp-dszaazmmftlmwbicuwcwaplkjdfs/Build/Intermediates/TheApp.build/Debug-iphoneos/TheApp.build/Objects-normal/arm64/UP_ViewController.o -embed-bitcode-marker 
1.  While type-checking 'computeFunction' at /Users/me/Documents/iOS/TheApp/TheApp/UP_ViewController.swift:184:5
2.  While type-checking expression at [/Users/me/Documents/iOS/TheApp/TheApp/UP_ViewController.swift:235:17 - line:235:66] RangeText="firstArray = (archiveArray as! Array)[0] as [Int]"

我有谁遇到过这种问题，请告诉我你是如何解决的。

Answer 1

您需要将您的 archiveArray 转换为 Array<Array<Any>> 然后您可以获得包含 Any 类型值的数组数组。

你的解决方案是

if let archiveData = dbRecord.value(forKey: "dataForAppArray") {
            if let archiveArray = NSKeyedUnarchiver.unarchiveObject(with: archiveData as! Data) as? Array<Array<Any>> {
                firstArray = archiveArray[0] as! [Int]
                secondArray = archiveArray[1] as! [CGFloat]
            }

}

举个例子加深理解

var firstArray = [Int](), secondArray = [CGFloat]()
firstArray.append(1)
firstArray.append(1)
firstArray.append(1)

secondArray.append(1.1)
secondArray.append(1.2)
secondArray.append(1.3)

print(firstArray) //[1, 1, 1]
print(secondArray) //[1.1, 1.2, 1.3]

let masterArray = [firstArray, secondArray] as [Any] //[[1, 1, 1], [1.1, 1.2, 1.3]]
let dataForApp:NSData = NSKeyedArchiver.archivedData(withRootObject: masterArray) as NSData

现在 unarchiveObject return Any 然后打印输出以便区分两个输出。

let archiveArray1 = NSKeyedUnarchiver.unarchiveObject(with: dataForApp as Data)
print(archiveArray1!)

输出将是

现在将数组转换为 Array<Array<Any>>

if let archiveArray = NSKeyedUnarchiver.unarchiveObject(with: dataForApp as Data) as? Array<Array<Any>> {
            print(archiveArray)
}

输出将是

[[1, 1, 1], [1.1, 1.2, 1.3]]

希望你明白我的意思。

NSKeyedArchiver & NSKeyedUnarchiver / Swift 3.0

NSKeyedArchiver & NSKeyedUnarchiver / Swift 3.0

nskeyedarchiver

ios

nskeyedunarchiver

swift3