What's wrong here: Instance member cannot be used on type [duplicate]

Answer 1

You can use this code

var items:Array<(Int, Int, Int, String, NSDate)> {
        get {
            return [
                (1, 9, 7, "A", mydate),
                (2, 9, 7, "B", mydate),
                (3, 9, 7, "C", mydate),
                (4, 9, 7, "D", mydate)
            ]
        }
    }

Answer 2

The compiler gets confused because it doesn't know the type of the optional NSDate. You can let it know explicitly about the type.

let items : Array<(Int, Int, Int, String, NSDate?)> = [
    (1, 9, 7, "A", nil),
    (2, 9, 7, "B", mydate),
    (3, 9, 7, "C", mydate),
    (4, 9, 7, "D", mydate)
]

Edit: For the problem with using instance variable, you could initialise your items with a closure.

let items : Array<(Int, Int, Int, String, NSDate?)> = {
    let mydate = NSDate()
    return [
        (1, 9, 7, "A", nil),
        (2, 9, 7, "B", mydate),
        (3, 9, 7, "C", mydate),
        (4, 9, 7, "D", mydate)
    ]
    }()

Answer 3

The problem here is that you are using self before the class is fully initialised. You can either have a getter which will be called every time you access the variable or compute it lazily.

Here is some code:

class TableViewController: UITableViewController {
    let mydate = NSDate()
    var items : [(Int,Int,Int,String,NSDate)] {
        get {
            return [
                (1, 9, 7, "A", mydate),
                (2, 9, 7, "B", mydate),
                (3, 9, 7, "C", mydate),
                (4, 9, 7, "D", mydate)
            ]

        }
    }
}

Lazy computation:

class TableViewController: UITableViewController {
    let mydate = NSDate()
    lazy var items : [(Int,Int,Int,String,NSDate)] =  {

            return [
                (1, 9, 7, "A", self.mydate),
                (2, 9, 7, "B", self.mydate),
                (3, 9, 7, "C", self.mydate),
                (4, 9, 7, "D", self.mydate)
            ]


    }()
}