如何解决unarchiveObject（withFile :)的弃用

Question

在iOS 12.1中unarchiveObject(withFile:)已弃用。
如何转换NSKeyedUnarchiver.unarchiveObject(withFile: String)为使用对NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(data: Data)或的调用NSKeyedUnarchiver.unarchivedObject(ofClasses: [AnyClass]：数据）或NSKeyedUnarchiver.unarchivedObject(ofClass: NSCoding.Protocol, from: Data)？

我猜您必须拥有类似的东西let fileData = try Data(contentsOf: URL)，然后使用这些方法之一来取消存档数据。但是，我无法弄清楚，折旧随附的文档没有帮助（至少对我而言）。

存档的数据非常简单-只是一个字符串数组NameToBeSaved（此代码定义的类数组）：

class NameToBeSaved: NSObject, NSCoding {
var name: String

init(userEnteredName: String) {
    self.name = userEnteredName
    super.init()
}

func encode(with aCoder: NSCoder) {
    aCoder.encode(name, forKey: "name")
}

required init?(coder aDecoder: NSCoder) {
    name = aDecoder.decodeObject(forKey: "name") as! String
    super.init()
}

这是调用unarchiveObject（withFile :)的代码-

init() {
    if let archivedCategoryNames = NSKeyedUnarchiver.unarchiveObject(withFile: categoryNameArchiveURL.path) as? [NameToBeSaved] {
        allCategories += archivedCategoryNames
    } else {
        for category in starterCategories {
            let thisNewCategory = NameToBeSaved(userEnteredName: category)
            createNewCategory(thisNewCategory)
        }
        sortCategories()
    }
}

Answer 1

我不知道这是否是最好的解决方案，但这为我解决了转换（旧代码注释掉以进行比较）：

    init() {

    do {
        let rawdata = try Data(contentsOf: categoryNameArchiveURL)
        if let archivedCategoryNames = try NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(rawdata) as! [NameToBeSaved]? {
            allCategories += archivedCategoryNames
        }
    } catch {
        print("Couldn't read file")
        for category in starterCategories {
            let thisNewCategory = NameToBeSaved(userEnteredName: category)
            createNewCategory(thisNewCategory)
        }
        sortCategories()
    }

/*        if let archivedCategoryNames = NSKeyedUnarchiver.unarchiveObject(withFile: categoryNameArchiveURL.path) as? [NameToBeSaved] {
            allCategories += archivedCategoryNames
        } else {
            for category in starterCategories {
                let thisNewCategory = NameToBeSaved(userEnteredName: category)
                createNewCategory(thisNewCategory)
            }
            sortCategories()
        }
 */
}

Answer 2

Swift 5，删除前缀“NS”并集中使用以供将来的更改...

class KeyedUnarchiver : NSKeyedUnarchiver {
    open override class func unarchiveObject(with data: Data) -> Any? {
        do {
            let object = try NSKeyedUnarchiver.unarchivedObject(ofClasses: [NSObject.self], from: data)
            return object
        }
        catch let error {
            Swift.print("unarchiveObject(with:) \(error.localizedDescription)")
            return nil
        }
    }

    open override class func unarchiveObject(withFile path: String) -> Any? {
        do {
            let data = try Data(contentsOf: URL.init(fileURLWithPath: path))
            let object = try unarchivedObject(ofClasses: [NSObject.self], from: data)
            return object
        }
        catch let error {
            Swift.print("unarchiveObject(withFile:) \(error.localizedDescription)")
            return nil
        }
    }
}

Answer 3

问题：取消归档 sks 文件以用作 SKEmitterNode。

旧方法，已弃用：

let filePath = Bundle.main.path(forResource: "myParticleEmitter", ofType: "sks")!
let burnerPathUnarchived = NSKeyedUnarchiver.unarchiveObject(withFile: burnerPath) as! SKEmitterNode

新方法：

do {
    let fileURL = Bundle.main.url(forResource: "myParticleEmitter", withExtension: "sks")!
    let fileData = try Data(contentsOf: fileURL)
    let unarchivedData = try NSKeyedUnarchiver.unarchiveTopLevelObjectWithData(burnerData) as! SKEmitterNode
} catch {
    print("didn't work")
}

然后你可以这样做：

mySKEffectNode.addChild(unarchivedData)
mySKSpriteNode.addChild(mySKEffectNode)