Sorting Dictionary of Strings into an Dictionary - sorting

Question

I'm trying to sort an Dictionary that contains a lot of Dictionaries inside using Swift 2.
var dicListItems: [String: [String: AnyObject]] = [
"Micke": ["LastName": "Andrius", "Age": 41],
"Brian": ["LastName": "Zini", "Age": 35],
"Frank": ["LastName": "Kramer", "Age": 28],
"Derek": ["LastName": "Allen", "Age": 25]
]
I'd like to sort by some different ways:
1) From LastName:
[
"Derek": ["LastName": "Allen", "Age": 25],
"Micke": ["LastName": "Andrius", "Age": 41],
"Frank": ["LastName": "Kramer", "Age": 28],
"Brian": ["LastName": "Zini", "Age": 35]
]
2) From FirstName:
[
"Brian": ["LastName": "Zini", "Age": 35],
"Derek": ["LastName": "Allen", "Age": 25],
"Frank": ["LastName": "Kramer", "Age": 28],
"Micke": ["LastName": "Andrius", "Age": 41]
]
3) From Age:
[
"Derek": ["LastName": "Allen", "Age": 25],
"Brian": ["LastName": "Zini", "Age": 35],
"Frank": ["LastName": "Kramer", "Age": 28],
"Micke": ["LastName": "Andrius", "Age": 41]
]

Answer 1

There are some problems with your situation:
Dictionary (and Set) is unordered collection (not like Array https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/CollectionTypes.html#//apple_ref/doc/uid/TP40014097-CH8-ID105).
Where is your "FirstName" in your demo data?
I suppose that you can convert your data into this kind of things (it's an Array so sortable):
var dicListItems: [[String : AnyObject]] = [
["FirstName" :"Micke", "LastName": "Andrius", "Age": 41],
["FirstName" : "Brian", "LastName": "Zini", "Age": 35],
["FirstName" : "Frank", "LastName": "Kramer", "Age": 28],
["FirstName" : "Derek", "LastName": "Allen", "Age": 25]
]
Then you can use .sort function of swift to sort your Array. For example, this is a sort by FirstName:
let dictListItems: [[String : AnyObject]] = [["FirstName" :"Micke", "LastName": "Andrius", "Age": 41], ["FirstName" : "Brian", "LastName": "Zini", "Age": 35], ["FirstName" : "Frank", "LastName": "Kramer", "Age": 28], ["FirstName" : "Derek", "LastName": "Allen", "Age": 25]]
let sortedList = dictListItems.sort {
item1, item2 in
let firstName1 = item1["FirstName"] as! String
let firstName2 = item2["FirstName"] as! String
return firstName1.compare(firstName2) != NSComparisonResult.OrderedAscending
}

Answer 2

The first problem, it is Objective-C, not Swift.
Second: you can't sort a Dictionary, you should use Array instead.
The solution in Swift 2 is here:
var listItems = [
["FirstName": "Micke", "LastName": "Andrius", "Age": 41],
["FirstName": "Brian", "LastName": "Zini", "Age": 35],
["FirstName": "Frank", "LastName": "Kramer", "Age": 28],
["FirstName": "Derek", "LastName": "Allen", "Age": 25]
]
listItems.sortInPlace( { ($0["FirstName"] as! String) < ($1["FirstName"] as! String)} )
print(listItems)
Obviously you can change the key in the sorting condition.