Swift 2.0 array initialization

Question

I have a class (NavBar) with a couple variables that I want to place in an array. I am currently getting this error.

'Instance member buttonOne cannot be used on type NavBar'

The code throwing the error is as follows.

// Buttons
var buttonOne: Button?
var buttonTwo: Button?
var buttonThree: Button?
var buttonFour: Button?
var buttonFive: Button?
var buttonsArray: [Button] = [buttonOne, buttonTwo, buttonThree, buttonFour, buttonFive]

do at least what Arsen recommended. However, the error you posted barely relates to the optionality of your Button instances. — Arthur Gevorkyan
– Arthur Gevorkyan, Commented Oct 7, 2015 at 12:22
Your code is missing some context for this error to make complete sense. — nhgrif
– nhgrif, Commented Oct 7, 2015 at 12:33
@Abhinav below provided enough of the answer. I had to initiate the array empty first then later within a function I add the values to the array. — Cody Weaver
– Cody Weaver, Commented Oct 8, 2015 at 1:34

Abhinav · Accepted Answer · 2015-10-07 12:28:07Z

3

Well, error says it all, you cannot add instance variables into another instance variable (Array). What you are looking for is something like this:

class navBar {

var buttonOne: Button?
var buttonTwo: Button?
var buttonThree: Button?
var buttonFour: Button?
var buttonFive: Button?

    var buttonsArray : [Button?] = []

    func addValues() {
        buttonOne = Button()
        buttonTwo = Button()
        buttonThree = Button()
        buttonFour = Button()
        buttonFive = Button()

        buttonsArray = [buttonOne, buttonTwo, buttonThree, buttonFour, buttonFive]
    }
}

answered Oct 7, 2015 at 12:28

Abhinav

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2 Comments

nhgrif Over a year ago

This is the only answer which correctly address (and explains) the actual error being asked about in the question.

Cody Weaver Over a year ago

@Abhinav I would really appreciate you marking this question as a good question if you feel that way.

Arsen · Accepted Answer · 2015-10-07 12:11:23Z

1

You cannot store optional values in array of values. Use [Button?] instead of [Button]

var buttonsArray: [Button?] = [buttonOne, buttonTwo, buttonThree, buttonFour, buttonFive]

answered Oct 7, 2015 at 12:11

Arsen

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1 Comment

nhgrif Over a year ago

Assuming the variables in the question are all instance variables of a class, this will produce the same error. You're only solving a problem that's not being asked about.

Adam · Accepted Answer · 2015-10-07 12:41:45Z

0

Not sure what your base class is but you should get the idea. The following setup works:

class Button {}

class MyClass {

    var buttonOne: Button?
    var buttonTwo: Button?
    var buttonThree: Button?
    var buttonFour: Button?
    var buttonFive: Button?
    var buttonsArray: [Button?]

    init() {
        buttonsArray = [buttonOne, buttonTwo, buttonThree, buttonFour, buttonFive]
    }
}

Ad Arsen pointed out, the array should be of [Button?] type to handle optionals and the array itself should be constructed in your init method. Depending on your base class this can be initWithCoder: or some other initialiser.

edited Oct 7, 2015 at 12:41

answered Oct 7, 2015 at 12:28

Adam

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