Unable to add object to a NSMutableArray

Question

I'm attempting to load a mutable array and got stuck.

Essentially what I want to do is to be able to add any class object to a global array. In this example I merely have name & address.

Here's a playground snippet:

import Foundation
var gDownloaders:NSMutableArray?

class downloader {
    var name:String?
    var address:String?
    init(name:String, address:String) {
        self.name = name
        self.address = address
    }
}

let one = downloader(name: "Ric Lee", address: "901 Edgewood")
let two = downloader(name: "Richard Brauer", address:"1010 Red Oak")
let three = downloader(name: "Meredith Lind", address: "410 Sunset Blvd")

gDownloaders?.addObject(one)
gDownloaders?.addObject(two)
gDownloaders?.addObject(three)

println(gDownloaders)

BTW: Xcode insist that I have the '?'/gDownloaders.

All I'm getting is nil for gDownloaders; even though each of the three objects are bona fide with data.

What am I doing wrong?

...should I use the Array vs NSMutableArray class instead?

gDownloaders Is nil because you never assigned a value to it... — Martin R, Oct 04 '14 at 00:24
There are *a lot of* similar questions and answers for Objective-C, e.g. http://stackoverflow.com/questions/1827058/nsmutablearray-addobject-not-working — Martin R, Oct 04 '14 at 00:26
Yah... forgot to initialized it. Found that out about an hour later. — Frederick C. Lee, Oct 04 '14 at 20:29

score 2 · Accepted Answer · edited Aug 03 '15 at 10:09

2

You never initialize gDownloaders. You declare what type the variable gDownloaders should have, but you don't put anything in that variable.

Try:

var gDownloaders:NSMutableArray? = NSMutableArray()

edited Aug 03 '15 at 10:09

Hiren

12,720
7
52
72

answered Oct 04 '14 at 00:26

algal

27,584
13
78
80

Correct. I found that out about an hour later. Thanks. – Frederick C. Lee Oct 04 '14 at 20:28

score 0 · Answer 2 · answered Oct 04 '14 at 00:32

In swift, in a playground try this:

import Foundation

class downloader {
    var name:String?
    var address:String?
    init(name:String, address:String) {
        self.name = name
        self.address = address
    }
}

var gDownloaders = [downloader]()

let one = downloader(name: "Ric Lee", address: "901 Edgewood")
let two = downloader(name: "Richard Brauer", address:"1010 Red Oak")
let three = downloader(name: "Meredith Lind", address: "410 Sunset Blvd")

gDownloaders.append(one)
gDownloaders.append(two)
gDownloaders.append(three)

println(gDownloaders[0].name!)

Unable to add object to a NSMutableArray

2 Answers2