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我無法檢索到在Swift 3中保存爲NSkeyed存檔的對象,並且正在縮小我的頭。對象保存成功是plist,但裝回時返回零無法在Swift3中檢索正確保存的NSKeyArchived對象
這裏是我使用的代碼:
類本身保存爲一個對象是相當容易:
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")
}
}
加載和保存對象的代碼:
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")
}
}
}
...最後,這是我做的叫了這一切:
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,我得到這個作爲輸出:
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
請注意,這是我自己的輸出 - 所以我做的(並已選中),該文件被正確創建。但它不會加載。誰能告訴我我做錯了什麼?
謝謝Maddy,這是一個出色而簡潔的答案! – Averett