Ios 使用NSKeyedUnarchiver解码URL对象数组

我正在尝试使用NSKeyedUnarchiver解码URL对象数组。代码如下：

let urlArray: [URL] = [URL(string: "https://apple.com")!,
                       URL(string: "https://google.com")!]

do {
    let archivedUrls = try NSKeyedArchiver.archivedData(withRootObject: urlArray, requiringSecureCoding: false)
    let _ = try NSKeyedUnarchiver.unarchivedObject(ofClass: NSArray.self, from: archivedUrls)
} catch {
    print(error)
}

我得到以下错误：

Error Domain=NSCocoaErrorDomain Code=4864 "value for key 'NS.objects' was of unexpected class 'NSURL'. Allowed classes are '{(
    NSArray
)}'." UserInfo={NSDebugDescription=value for key 'NS.objects' was of unexpected class 'NSURL'. Allowed classes are '{(
    NSArray
)}'.}

如果我用

替换
让我尝试NSKeyedUnarchiver.unarchivedObject（类：NSArray.self，from:archivedUrls）
，让我尝试NSKeyedUnarchiver.unarchivedObject（类：[NSArray.self，NSURL.self]，from:archivedUrls）

，那么它就工作了。但这意味着它可以解码

NSArray

或

NSURL

对象，而不是包含

NSURL

对象的

NSArray

如果我将数组改为

字符串的数组

，则一切正常：

let stringArray: [String] = ["string", "string2"]

do {
    let archivedStrings = try NSKeyedArchiver.archivedData(withRootObject: stringArray, requiringSecureCoding: false)
    let _ = try NSKeyedUnarchiver.unarchivedObject(ofClass: NSArray.self, from: archivedStrings)
} catch {
    print(error)
}

---

有人对这种行为有解释吗？

如果您不需要安全编码（

要求安全编码：false

），您可以使用

unarchiveTopLevelObjectWithData（:）

）

或者您可以使用

unarchivedObject（对于类：from:）

指定存档中包含的类型

NSString

似乎是此规则的例外

do {
    let archivedUrls = try NSKeyedArchiver.archivedData(withRootObject: urlArray, requiringSecureCoding: false)
    if let urls = try NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(archivedUrls) as? [URL] {
        print(urls)
    } else {
        print("not URLs")
    }
} catch {
    print(error)
}

do {
    let archivedUrls = try NSKeyedArchiver.archivedData(withRootObject: urlArray, requiringSecureCoding: true)
    if let urls = try NSKeyedUnarchiver.unarchivedObject(ofClasses: [NSArray.self, NSURL.self], from: archivedUrls) as? [URL] {
        print(urls)
    } else {
        print("not URLs")
    }
} catch {
    print(error)
}