Saving array using NSUserDefaults crashes app - ios

Question

I feel as if I am doing things correctly, but I am getting an error at the end of my data conversion and retrieval. Please see the code below:
class Task:NSObject, NSCoding {
var name:String
var notes:String
var date:NSDate
var taskCompleted:Bool
init(name:String, notes:String,date:NSDate, taskCompleted:Bool){
self.name = name
self.notes = notes
self.date = date
self.taskCompleted = taskCompleted
}
required init(coder decoder: NSCoder){
self.name = (decoder.decodeObjectForKey("name") as! String?)!
self.notes = (decoder.decodeObjectForKey("notes") as! String?)!
self.date = (decoder.decodeObjectForKey("date") as! NSDate?)!
self.taskCompleted = (decoder.decodeObjectForKey("taskCompleted") as! Bool?)!
}
func encodeWithCoder(coder: NSCoder) {
coder.encodeObject(self.name, forKey: "name")
coder.encodeObject(self.notes, forKey: "notes")
coder.encodeObject(self.date, forKey: "date")
coder.encodeObject(self.taskCompleted, forKey: "taskCompleted")
}
}
I then save and get the data as follows:
let nowData = NSKeyedArchiver.archivedDataWithRootObject([nowTasks])
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(nowData, forKey: "nowData")
let loadedData = defaults.dataForKey("nowData")
let loadedArray = NSKeyedUnarchiver.unarchiveObjectWithData(loadedData!) as! [Task]
When I call print(loadedArray.first) I get the error: NSArray element failed to match the Swift Array Element type

Answer 1

Looks like your code should work fine even with some really weird forced casting going on in your decoder method. Try like this:
class Task: NSObject, NSCoding {
var name = String()
var notes = String()
var date: NSDate
var taskCompleted: Bool
init(name: String, notes: String, date: NSDate, taskCompleted: Bool){
self.name = name
self.notes = notes
self.date = date
self.taskCompleted = taskCompleted
}
required init(coder decoder: NSCoder){
self.name = decoder.decodeObjectForKey("name") as! String
self.notes = decoder.decodeObjectForKey("notes") as! String
self.date = decoder.decodeObjectForKey("date") as! NSDate
self.taskCompleted = decoder.decodeBoolForKey("taskCompleted")
}
func encodeWithCoder(coder: NSCoder) {
coder.encodeObject(name, forKey: "name")
coder.encodeObject(notes, forKey: "notes")
coder.encodeObject(date, forKey: "date")
coder.encodeBool(taskCompleted, forKey: "taskCompleted")
}
}
Testing with plist files:
let task1 = Task(name: "task1", notes: "note a", date: NSDate(), taskCompleted: false)
let task2 = Task(name: "task2", notes: "note b", date: NSDate(), taskCompleted: true)
let documentsDirectory = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory, inDomains: .UserDomainMask).first!
let fileURL = documentsDirectory.URLByAppendingPathComponent("data.plist")
if let filePath = fileURL.path {
NSKeyedArchiver.archiveRootObject([task1,task2], toFile: filePath)
if let loadedArray = NSKeyedUnarchiver.unarchiveObjectWithFile(filePath) as? [Task] {
print(loadedArray.count)
print(loadedArray.first?.name ?? "")
print(loadedArray.first?.notes ?? "")
print(loadedArray.first!.date )
print(loadedArray.first!.taskCompleted)
print(loadedArray.last?.name ?? "")
print(loadedArray.last?.notes ?? "")
print(loadedArray.last!.date )
print(loadedArray.last!.taskCompleted)
}
}