NSDateformatter dateFromString AnyObject - ios

Question

I have an array of AnyObjects of NSDates and I am trying to convert to weekdays like (Mon, Tue, Wed..)
The Array looks like this when I print it to the console:
[2014-12-03 22:16:26 +0000, 2014-12-05 22:16:26 +0000, 2014-12-11
22:16:26 +0000]
This is my Code:
var xAxisDates = [AnyObject]()
func dateformatter() {
let formatter = NSDateFormatter()
formatter.dateFormat = "yyyy-MM-dd HH:mm:ss Z"
let weekDayFormatter = NSDateFormatter()
weekDayFormatter.dateFormat = "EEE"
println(xAxisDates)
for i in xAxisDates{
let date = formatter.dateFromString(i as String)
println(weekDayFormatter.stringFromDate(date!))
}
}
The code crash at :
let date = formatter.dateFromString(i as String)
I have been trying all day to figure out what I am doing wrong, and read practically every question on NSDateFormatter but to no avail. I am down casting i as String because if I don´t I get error message AnyObject is not convertible to String. My feeling is that the type do not match up, but I am not sure, and I don´t know how to find out. I have attached the error message as picture if that helps. If you can recommend a tutorial or book or something on how to understand what is wrong I would appreciate it, as I am trying to learn.
Any help would be much appreciated !

Answer 1

The xAxisDates array contains NSDate objects, therefore
let date = formatter.dateFromString(i as String)
does not make any sense, and i as String already crashes because i is an NSDate
and not a String.
You just need to convert the dates to a string:
for i in xAxisDates {
println(weekDayFormatter.stringFromDate(i as NSDate))
}
or better check if the array elements actually are NSDate objects:
for i in xAxisDates {
if let date = i as? NSDate {
println(weekDayFormatter.stringFromDate(date))
}
}

Answer 2

extension NSDate {
var weekdayName: String {
let formatter = NSDateFormatter()
formatter.dateFormat = "EEEE"
return formatter.stringFromDate(self)
}
}
let myArrayOfAnyObjects:[AnyObject] = [NSDate()]
myArrayOfAnyObjects.first!.weekdayName // "Tuesday"