Swift - multidimensional array sort

Question

In order to create table view programmatically i have a menu setup like below, it contains sections as well as cells.

var menu = [
    "section 1": [
        "point a",
        "point b",
        "point c"
    ],
    "section 2": [
        "point a",
        "point b",
        "point c",
        "point d",
        "point e"
    ],
    "section 3": [
        "point a"
    ]
]

struct Sections {
    var sectionName : String!
    var sectionObjects : [String]!
}

var sections = [Sections]()

for (key, value) in menu {
    print("\(key) -> \(value)")
    sections.append(Sections(sectionName: key, sectionObjects: value))
}

So i want it exactly inserted in this order (section 1 -> section 2 -> section 3).

But it is actually inserted in an other order(from print):

section 2 -> ["point a", "point b", "point c", "point d", "point e"]
section 1 -> ["point a", "point b", "point c"]
section 3 -> ["point a"]

I absolutely dont know why the order is changed in the menu array. Anybody can imagine why or have some suggestions?

Thanks and Greetings!

Community · Accepted Answer · 2017-05-23 11:50:34Z

2

Dictionaries in Swift don't have an order to them. So when you iterate through one, you won't necessarily encounter them in the same order that they were added.

Check out this answer for more detail: https://stackoverflow.com/a/24111700/3517395

edited May 23, 2017 at 11:50

CommunityBot

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answered Feb 20, 2016 at 17:43

yesthisisjoe

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Comments

Code Different · Accepted Answer · 2016-02-20 17:44:06Z

1

That's because Dictionary has no order. You must sort the keys yourself before iterating over them:

for key in menu.keys.sort() {
    let value = menu[key]!
    sections.append(Sections(sectionName: key, sectionObjects: value))
}

answered Feb 20, 2016 at 17:44

Code Different

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1 Comment

Code Different Over a year ago

for key in menu.keys.sort() iterate through the keys sorted alphabetically. It works as expected on my Mac.

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