Swift WeakArray

Version 1.0
WeakArray offers a collection type that behaves like a Swift Array, but will not retain any of its objects.

Released under the Apache License, version 2.0

How to Install

This should only be used with the latest version of Xcode 6.

1. Clone this repository.
2. Add WeakArray.xcodeproj to your main target.
3. Link the WeakArray framework in your main target.

Usage

First make sure to import WeakArray:

import WeakArray

When creating a weak array, specify the collection type as you would with an Array:

typealias myType = AnyObject
let a = WeakArray<MyType>()

You can also pass in an array literal when creating a weak array, but because Arrays cannot hold optionals you'll need to get a non-optional value first if you want to do this:

let view: UIView? = UIView()
let a = WeakArray<UIView>(array: [view!])

Otherwise a WeakArray works just like an Array:

let a = WeakArray<AnyObject>()

let view: UIView? = UIView()

// Operator +=
a += view

// Append
a.append(view)

// Replace with index
a[0] = view

// Replace with range
a[0..1] = [view, view]

// Remove Last
a.removeLast()

// Remove at index
let view: UIView? = a.removeAtIndex(0)

// isEmpty and count
if (!a.isEmpty) {
	println("Count: \(a.count)")
}

You can also enumerate over a WeakArray like you would an Array, but keep in mind it will skip over nil values while count will include them, so count may not match the number of enumerations you get.

func testIterationIsNotInterruptedByNilObject() {
    var a = WeakArray<UIView>()
    var obj1: UIView? = UIView()
    var obj2: UIView? = UIView()
    var obj3: UIView? = UIView()
    a += obj1
    a += obj2
    a += obj3
    obj2 = nil
    var i = 0     
    for value in a {
        i++
    }
    XCTAssert(a.count == 3, "")
    XCTAssert(i == 2, "")
}