Ios 无法在Swift3中检索正确保存的NSKeyArchived对象
我无法在Swift 3中检索保存为NSkeyed存档的对象,我正在抓狂。该对象已成功保存为plist,但在加载回时返回为nil 以下是我使用的代码: 要保存为对象的类本身相当简单:Ios 无法在Swift3中检索正确保存的NSKeyArchived对象,ios,swift,swift3,nskeyedarchiver,nskeyedunarchiver,Ios,Swift,Swift3,Nskeyedarchiver,Nskeyedunarchiver,我无法在Swift 3中检索保存为NSkeyed存档的对象,我正在抓狂。该对象已成功保存为plist,但在加载回时返回为nil 以下是我使用的代码: 要保存为对象的类本身相当简单: import Foundation class ItemList:NSObject, NSCoding { var name: String = "" //Name of the Item list var contents: [Int] = [] //Ints referencing the C
import Foundation
class ItemList:NSObject, NSCoding {
var name: String = "" //Name of the Item list
var contents: [Int] = [] //Ints referencing the CoreData PackItems
init (listname:String, ContentItems:[Int]) {
self.name=listname
self.contents=ContentItems
}
//MARK: NSCoding
public convenience required init?(coder aDecoder: NSCoder) {
let thename = aDecoder.decodeObject(forKey: "name") as! String
let thecontents = aDecoder.decodeObject(forKey: "contents") as! [Int]
self.init(listname: thename,ContentItems: thecontents)
}
func encode(with aCoder: NSCoder) {
aCoder.encode(self.name,forKey:"name")
aCoder.encode(self.contents, forKey: "contents")
}
}
加载和保存对象的代码:
class FileHandler: NSObject {
class func getDocumentsDirectory() -> URL {
let filemgr = FileManager.default
let urls = filemgr.urls(for: .documentDirectory, in: .userDomainMask)
let result:URL = urls.first!
return result
}
///This returns the contents of the handed file inside the Documents directory as the object it was saved as.
class func getFileAsObject(filename:String) -> AnyObject? {
let path = getDocumentsDirectory().appendingPathComponent(filename)
if let result = NSKeyedUnarchiver.unarchiveObject(withFile: path.absoluteString) {
//Success
print("Loaded file '"+filename+"' from storage")
return result as AnyObject?
} else {
print("Error: Couldn't find requested object '"+filename+"' in storage at "+path.absoluteString)
return nil
}
}
///This saves the handed object under the given filename in the App's Documents directory.
class func saveObjectAsFile(filename:String, Object:AnyObject) {
let data = NSKeyedArchiver.archivedData(withRootObject: Object)
let fullPath = getDocumentsDirectory().appendingPathComponent(filename)
do {
try data.write(to: fullPath)
print("Wrote file '"+filename+"' to storage at "+fullPath.absoluteString)
} catch {
print("Error: Couldn't write file '"+filename+"' to storage")
}
}
}
…最后,这就是我所做的一切:
let testobject:ItemList = ItemList.init(listname: "testlist", ContentItems: [0,0,1,2])
FileHandler.saveObjectAsFile(filename:"Test.plist",Object:testobject)
let tobi = FileHandler.getFileAsObject(filename:"Test.plist") as! ItemList
唉,我将此作为输出:
Wrote file 'Test.plist' to storage at file:///…/data/Containers/Data/Application/6747B038-B0F7-4B77-85A8-9EA02BC574FE/Documents/Test.plist
Error: Couldn't find requested object 'Test.plist' in storage at file:///…/data/Containers/Data/Application/6747B038-B0F7-4B77-85A8-9EA02BC574FE/Documents/Test.plist
请注意,这是我自己的输出——因此我确认(并已检查)文件创建正确。但它无法加载。有人能告诉我我做错了什么吗?问题在于传递给
unarchiveObject(with file:)
的路径
更改:
if let result = NSKeyedUnarchiver.unarchiveObject(withFile: path.absoluteString) {
致:
另一方面,您应该使用对称API来编写和读取逻辑。写入数据时,将根对象归档到数据
对象,然后将数据
对象写入文件。但是在读取时,如果给定文件路径,则直接取消归档对象树
将编写代码更改为使用
archiveRootObject(:toFile:)
,或将读取代码更改为从文件加载数据,然后取消归档数据。当前代码可以正常工作(一旦解决了路径问题),但不一致。问题在于传递给unarchiveObject(with file:)
的路径
更改:
if let result = NSKeyedUnarchiver.unarchiveObject(withFile: path.absoluteString) {
致:
另一方面,您应该使用对称API来编写和读取逻辑。写入数据时,将根对象归档到数据
对象,然后将数据
对象写入文件。但是在读取时,如果给定文件路径,则直接取消归档对象树
将编写代码更改为使用archiveRootObject(:toFile:)
,或将读取代码更改为从文件加载数据,然后取消归档数据。您当前的代码可以工作(一旦您解决了路径问题),但并不一致