This has been asked and answered before using NSSortDescriptor where it is quite easy. But is there a Swift-standard way using Array.sort()?
struct Sortable {
let isPriority: Bool
let ordering: Int
}
Sorting an array of Sortables by one property is simple:
sort { $0.ordering < $1.ordering }
But I want to sort by isPriority then by ordering - and I can't get my head around a simple statement to make that happen.
Yes there is a very simple way using the Array.sort()
Code:
var sorted = array.sorted({ (s1, s2) -> Bool in
if s1.isPriority && !s2.isPriority {
return true //this will return true: s1 is priority, s2 is not
}
if !s1.isPriority && s2.isPriority {
return false //this will return false: s2 is priority, s1 is not
}
if s1.isPriority == s2.isPriority {
return s1.ordering < s2.ordering //if both save the same priority, then return depending on the ordering value
}
return false
})
The sorted array:
true - 10
true - 10
true - 12
true - 12
true - 19
true - 29
false - 16
false - 17
false - 17
false - 17
false - 18
Another a bit shorter solution:
let sorted = array.sorted { t1, t2 in
if t1.isPriority == t2.isPriority {
return t1.ordering < t2.ordering
}
return t1.isPriority && !t2.isPriority
}
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