DictionaryのSortは事前に配列をソートしておく

SortDictionary.swift

import Foundation

enum Gender {
    case female
    case male
    case other
}

let array = [
    (name: "Shun",   gender: Gender.male),
    (name: "Mai",    gender: Gender.female),
    (name: "Tomoya", gender: Gender.male),
    (name: "Koji",   gender: Gender.male),
    (name: "Nozomi", gender: Gender.female),
    (name: "Hikaru", gender: Gender.other),
    (name: "Kenta",  gender: Gender.male),
    (name: "Nao",    gender: Gender.female),
    (name: "Keiko",  gender: Gender.female),
]
let dictionary =  Dictionary(grouping: array, by: {$0.gender})
let sortedDictionary = Dictionary(grouping: array.sorted(by: { $0.name < $1.name}), by: {$0.gender})

print("--- not sorted ------------------------")
print(dictionary[.female]!)
print("--- not sorted ------------------------")
print(dictionary[.male]!)
print("--- not sorted ------------------------")
print(dictionary[.other]!)
print("--- sorted ------------------------")
print(sortedDictionary[.female]!)
print("--- sorted ------------------------")
print(sortedDictionary[.male]!)
print("--- sorted ------------------------")
print(sortedDictionary[.other]!)