我在Swift 3中创建了一篇关于如何做到简单易读的博客文章。您可以在这里找到它:
http://master-method.com/index.php/2016/11/23/sort-a-sequence-i-e-arrays-of-objects-by-multiple-properties-in-swift-3/
您还可以在GitHub存储库中找到代码:
https://github.com/jallauca/SortByMultipleFieldsSwift.playground
如果你有一个位置列表,你就可以做到这一点:
struct Location {
var city: String
var county: String
var state: String
}
var locations: [Location] {
return [
Location(city: "Dania Beach", county: "Broward", state: "Florida"),
Location(city: "Fort Lauderdale", county: "Broward", state: "Florida"),
Location(city: "Hallandale Beach", county: "Broward", state: "Florida"),
Location(city: "Delray Beach", county: "Palm Beach", state: "Florida"),
Location(city: "West Palm Beach", county: "Palm Beach", state: "Florida"),
Location(city: "Savannah", county: "Chatham", state: "Georgia"),
Location(city: "Richmond Hill", county: "Bryan", state: "Georgia"),
Location(city: "St. Marys", county: "Camden", state: "Georgia"),
Location(city: "Kingsland", county: "Camden", state: "Georgia"),
]
}
let sortedLocations =
locations
.sorted(by:
ComparisonResult.flip <<< Location.stateCompare,
Location.countyCompare,
Location.cityCompare
)