Passing Objects To WatchKit with NSKeyedArchiver - swift

Question

class Parent: NSObject, NSCoding {
var name : String?
var childs : [Child]?
override init() {}
func encode(with aCoder: NSCoder) {
aCoder.encode(name, forKey: "name")
aCoder.encode(childs, forKey: "childs")
}
required init(coder aDecoder: NSCoder) {
name = aDecoder.decodeObject(forKey: "name") as? String
childs = aDecoder.decodeObject(forKey: "childs") as? [Child]
super.init()
}
}
class Child: NSObject, NSCoding {
var name: String?
override 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()
}
}
// iOS side:
public func session(_ session: WCSession, didReceiveMessage message: [String : Any], replyHandler: #escaping ([String : Any]) -> Swift.Void) {
var parent = Parent()
parent.name = "John"
var child1 = Child()
var child2 = Child()
parent.childs = [child1, child2]
NSKeyedArchiver.setClassName("Parent", for: Parent.self)
let data = NSKeyedArchiver.archivedData(withRootObject: parent)
replyHandler(["parent": data as AnyObject])
}
// watchOS side:
if WCSession.isSupported() {
session = WCSession.default()
session!.sendMessage(["getParent": "getParent"], replyHandler: { (response) -> Void in
if let rawParent = response as? [String:Data] {
NSKeyedUnarchiver.setClass(Parent.self, forClassName: "Parent")
if let parent = NSKeyedUnarchiver.unarchiveObject(with: data) as? Parent {
// do something
}
}
}, errorHandler: { (error) -> Void in
print(error)
})
}
in this case as you can see I used the NSKeyedUnarchiver.setClass and NSKeyedArchiver.setClassName methods which are working but I still get a runtime crash:
[NSKeyedUnarchiver decodeObjectForKey:]: cannot decode object of class (Child) for key (NS.objects)
If I remove the NSKeyedUnarchiver.setClass(Parent.self, forClassName: "Parent") and the NSKeyedArchiver.setClassName("Parent", for: Parent.self) rows I get the same error but for Parent class. So I am sure that I have to use the same method call for Child but I dont know where.
Anybody has any idea?

Answer 1

Okey I found the solution, if you have the same structure you just simply set the class names after each other
NSKeyedArchiver.setClassName("Parent", for: Parent.self)
NSKeyedArchiver.setClassName("Child", for: Child.self)
and the same when you unarchive it:
NSKeyedUnarchiver.setClass(Parent.self, forClassName: "Parent")
NSKeyedUnarchiver.setClass(Child.self, forClassName: "Child")