如何在 Swift/Xcode 中对 1 个数组进行排序并通过相同的键更改对多个其他数组重新排序 [英] How to sort 1 array in Swift / Xcode and reorder multiple other arrays by the same keys changes
问题描述
很抱歉问题的措辞过于复杂.我的主要经验是使用 PHP,它有一个名为 array_multisort 的命令.语法如下:
Sorry for the complex wording of the question. My main experience is with PHP and it has a command called array_multisort. The syntax is below:
bool array_multisort ( array &$array1 [, mixed $array1_sort_order = SORT_ASC [, mixed $array1_sort_flags = SORT_REGULAR [, mixed $... ]]] )
它允许您对 1 个数组进行排序,并根据原始数组中的键更改对多个其他数组进行重新排序.
It lets you sort 1 array and the reorder multiple other arrays based on the key changes in the original.
Swift/Xcode 7.2 中是否有等效的命令?
Is there an equivalent command in Swift / Xcode 7.2?
我目前有一组数组:
名字年龄城市国家活跃
Active 是用户在我的应用中处于活动状态的时间数组(以秒为单位).我想对降序或升序以及其他数组进行排序以保持一致.
Active is an array of time in seconds that a user has been active within my app. I would like to order that descending or ascending and the other arrays to change to remain consistent.
推荐答案
您可以按排序顺序创建索引数组并将其用作映射:
You could create an array of indexes in sorted order and use it as a mapping:
var names = [ "Paul", "John", "David" ]
var ages = [ 35, 42, 27 ]
let newOrder = names.enumerate().sort({$0.1<$1.1}).map({$0.0})
names = newOrder.map({names[$0]})
ages = newOrder.map({ages[$0]})
这是对技术的改进:
这是相同的方法,但在一个步骤中进行排序和分配.(可以重新分配给原始数组或单独的数组)
It's the same approach but does the sorting and assignment in one step. (can be reassigned to original arrays or to separate ones)
(firstNames,ages,cities,countries,actives) =
{(
$0.map{firstNames[$0]},
$0.map{ages[$0]},
$0.map{cities[$0]},
$0.map{countries[$0]},
$0.map{actives[$0]}
)}
(firstNames.enumerated().sorted{$0.1<$1.1}.map{$0.0})
和一个 Array 扩展,使其在原位排序时更易于使用:
and an Array extension to make it even easier to use if you are sorting in place:
extension Array where Element:Comparable
{
func ordering(by order:(Element,Element)->Bool) -> [Int]
{ return self.enumerated().sorted{order($0.1,$1.1)}.map{$0.0} }
}
extension Array
{
func reorder<T>(_ otherArray:inout [T]) -> [Element]
{
otherArray = self.map{otherArray[$0 as! Int]}
return self
}
}
firstNames.ordering(by: <)
.reorder(&firstNames)
.reorder(&ages)
.reorder(&cities)
.reorder(&countries)
.reorder(&actives)
结合前两者:
extension Array
{
func reordered<T>(_ otherArray:[T]) -> [T]
{
return self.map{otherArray[$0 as! Int]}
}
}
(firstNames,ages,cities,countries,actives) =
{(
$0.reordered(firstNames),
$0.reordered(ages),
$0.reordered(cities),
$0.reordered(countries),
$0.reordered(actives)
)}
(firstNames.ordering(by:<))
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