I am trying to implement NSSecureCoding but am getting some problems my code is this. a class called WrapperClass:
public class WrapperClass:NSObject, NSCoding, NSSecureCoding {
public static var supportsSecureCoding: Bool = true
var attributedStrings = [TextDocumentClass]()
init(pAttributedStrings:[TextDocumentClass]) {
self.attributedStrings = pAttributedStrings
}
required public init?(coder aDecoder: NSCoder){
self.attributedStrings = aDecoder.decodeObject(of: [TextDocumentClass.self], forKey: "attributedStrings") as? [TextDocumentClass]
//return self
}
public func encode(with aCoder: NSCoder) {
aCoder.encode(attributedStrings,forKey:"attributedStrings")
}
}
when this code get run i get nil instead of array of TextDocumentClass and i don't now why, i have tried using the following classes in aDecoder.decodeObject ([TextDocumentClass.self], NSArray.self and TextDocumentClass.self] but they all give the same I have made my own ValueTransformer because i need to support some classes that i don't think is included with the default for NSSecureUnarchiveFromDataTransformer
@objc(MyTestClassValueTransformer)
final class MyClassValueTransformer: NSSecureUnarchiveFromDataTransformer {
static let name = NSValueTransformerName(rawValue: String(describing: MyClassValueTransformer.self))
public static func register() {
let transformer = MyClassValueTransformer()
ValueTransformer.setValueTransformer(transformer, forName: name)
}
override static var allowedTopLevelClasses: [AnyClass] {
return super.allowedTopLevelClasses + [WrapperClass.self, UIFont.self, NSObject.self, NSParagraphStyle.self]
}
override public class func transformedValueClass() -> AnyClass {
return WrapperClass.self
}
override public class func allowsReverseTransformation() -> Bool {
return true
}
override public func transformedValue(_ value: Any?) -> Any? {
guard let data = value as? Data else {
return nil
}
do {
let box = try NSKeyedUnarchiver.unarchivedObject(
ofClass: WrapperClass.self,
from: data
)
return box
} catch {
return nil
}
}
override public func reverseTransformedValue(_ value: Any?) -> Any? {
guard let box = value as? WrapperClass else {
return nil
}
do {
let data = try NSKeyedArchiver.archivedData(
withRootObject: box,
requiringSecureCoding: true
)
return data
} catch {
return nil
}
}
}
The class TextDocumentClass contains the following variables NSAttributedString, String, Bool and Int
public class TextDocumentClass:NSObject, NSCoding, NSSecureCoding {
public static var supportsSecureCoding: Bool = true
var attributedText: NSAttributedString!
var uuid:String!
var isDeleted:Bool!
var isChanged:Bool!
var prevPageUUID:String!
var nextPageUUID:String!
var order:Int!
var lastUpdatedDate:String!
var isPDF: Bool!
var pdfURL: String!
var pdfPageNumber: Int!
init (pAttributedText:NSAttributedString, pUUID:String, pPrevPageUUID:String, pNextPageUID:String, pOrder:Int, pIsDeleted: Bool, pIsChanged: Bool, pLastUpdatedDate: String, isPDF: Bool = false, pdfURL: String = "", pdfPageNumber: Int = -1) {
self.attributedText = pAttributedText
self.uuid = pUUID
self.isDeleted = pIsDeleted
self.isChanged = pIsChanged
self.prevPageUUID = pPrevPageUUID
self.nextPageUUID = pNextPageUID
self.order = pOrder
self.lastUpdatedDate = pLastUpdatedDate
self.isPDF = isPDF
self.pdfURL = pdfURL
self.pdfPageNumber = pdfPageNumber
}
required public init?(coder aDecoder: NSCoder){
self.attributedText = (aDecoder.decodeObject(of: NSAttributedString.self, forKey: "attributedText"))!
self.prevPageUUID = (aDecoder.decodeObject(of: NSString.self, forKey: "prevPageUUID") as? String)!
self.nextPageUUID = (aDecoder.decodeObject(of: NSString.self, forKey: "nextPageUUID") as? String)!
self.uuid = (aDecoder.decodeObject(of: NSString.self, forKey: "uuid") as? String)!
self.isChanged = (aDecoder.decodeObject(of: NSNumber.self, forKey: "isChanged")?.boolValue)!
self.isDeleted = (aDecoder.decodeObject(of: NSNumber.self, forKey: "isDeleted")?.boolValue)!
self.order = (aDecoder.decodeObject(of: NSNumber.self, forKey: "order")?.intValue)!
self.lastUpdatedDate = (aDecoder.decodeObject(of: NSString.self, forKey: "lastUpdatedDate") as? String)!
self.isPDF = aDecoder.decodeObject(of: NSNumber.self, forKey: "isPDF")?.boolValue ?? false
self.pdfURL = (aDecoder.decodeObject(of: NSString.self, forKey: "pdfURL") as? String ?? "")
self.pdfPageNumber = aDecoder.decodeObject(of: NSNumber.self, forKey: "PDFpageNumber")?.intValue ?? -1
}
public func encode(with aCoder: NSCoder) {
aCoder.encode(attributedText,forKey:"attributedText")
aCoder.encode(prevPageUUID,forKey:"prevPageUUID")
aCoder.encode(nextPageUUID,forKey:"nextPageUUID")
aCoder.encode(uuid,forKey:"uuid")
aCoder.encode(isChanged,forKey:"isChanged")
aCoder.encode(isDeleted,forKey:"isDeleted")
aCoder.encode(order,forKey:"order")
aCoder.encode(lastUpdatedDate,forKey:"lastUpdatedDate")
aCoder.encode(isPDF, forKey: "isPDF")
aCoder.encode(pdfURL, forKey: "pdfURL")
aCoder.encode(pdfPageNumber, forKey: "PDFpageNumber")
}
override public init() {
self.attributedText = NSAttributedString()
self.uuid = ""
self.isDeleted = false
self.isChanged = false
self.prevPageUUID = ""
self.nextPageUUID = ""
self.order = -1
self.lastUpdatedDate = ""
self.isPDF = false
self.pdfURL = ""
self.pdfPageNumber = -1
}
}
A little extra information not sure if it helps, i figure out how to get a error about why its nil
//this code line
let temp = try aDecoder.decodeTopLevelObject(of: [BaselineClass.self], forKey: "attributedStrings")
//gives this print in console
Allowed classes are:
{(
"'demo.BaselineClass' (0x100f6fc40) [/private/var/containers/Bundle/Application/EF7BF8EB-A98B-4B52-AE8F-1FB05F31ECC3/demo.app]"
)}" UserInfo={NSDebugDescription=value for key 'attributedStrings' was of unexpected class 'NSArray' (0x1fc4b89e0) [/System/Library/Frameworks/CoreFoundation.framework].
Allowed classes are:
{(
"'demo.BaselineClass' (0x100f6fc40) [/private/var/containers/Bundle/Application/EF7BF8EB-A98B-4B52-AE8F-1FB05F31ECC3/demo.app]"
)}}
//if i change the code line to use NSArray.self so it looks like this
let temp = try aDecoder.decodeTopLevelObject(of: NSArray.self, forKey: "attributedStrings")
//i get this in console instead
Allowed classes are:
{(
"'NSArray' (0x1fc4b89e0) [/System/Library/Frameworks/CoreFoundation.framework]"
)}" UserInfo={NSDebugDescription=value for key 'NS.objects' was of unexpected class 'demo.BaselineClass' (0x103363c40) [/private/var/containers/Bundle/Application/1E080145-14D1-4D03-9520-E87C39B8F2C7/demo.app].
Allowed classes are:
{(
"'NSArray' (0x1fc4b89e0) [/System/Library/Frameworks/CoreFoundation.framework]"
)}}
Any help in solving this is appreciated thanks.
After communication back and forth with Apple the following solved my problem. When decoding the array of classes se code
self.attributedStrings = aDecoder.decodeObject(of: [TextDocumentClass.self], forKey: "attributedStrings") as? [TextDocumentClass]
it should be changed to this.
self.attributedStrings = aDecoder.decodeObject(of: [NSArray.self, TextDocumentClass.self], forKey: "attributedStrings") as? [TextDocumentClass]
Then i also had some other small bug in my TextDocumentClass public initialiser where instead of decodeObject for bool and int i should use decodeBool and decodeInt32.