swiftnsindexset

How to remove IndexSetA from IndexSetB in Swift？

In Objective-C, the NSIndexSet can removeIndexes:(NSIndexSet *)indexSet:

[aIndexSet removeIndexes: bIndexSet];

Is there some way to do this with IndexSet in Swift like the NSIndexSet in Objective-C?

Solution

  • There is a function, from the documentation

    mutating func subtract(_ other: IndexSet)

    Removes the elements of the given set from this set.

    var aIndexSet = IndexSet(integersIn: 0..<7)
let bIndexSet = IndexSet(integersIn: 4..<12)

aIndexSet.subtract(bIndexSet)

print(aIndexSet) // 0..<3