Swift: Sort Array by sort descriptors

Question

I am using coredata so I need sort descriptors for my entities

For example, a Coordinate-entity has this class func:

class func sortDescriptors() -&g         


        

Answer 1

Swift 3 Version of @Darniel's answer

extension MutableCollection where Self : RandomAccessCollection {
    /// Sort `self` in-place using criteria stored in a NSSortDescriptors array
    public mutating func sort(sortDescriptors theSortDescs: [NSSortDescriptor]) {
        sort { by:
            for sortDesc in theSortDescs {
                switch sortDesc.compare($0, to: $1) {
                case .orderedAscending: return true
                case .orderedDescending: return false
                case .orderedSame: continue
                }
            }
            return false
        }

    }
}

extension Sequence where Iterator.Element : AnyObject {
    /// Return an `Array` containing the sorted elements of `source`
    /// using criteria stored in a NSSortDescriptors array.

    public func sorted(sortDescriptors theSortDescs: [NSSortDescriptor]) -> [Self.Iterator.Element] {
        return sorted {
            for sortDesc in theSortDescs {
                switch sortDesc.compare($0, to: $1) {
                case .orderedAscending: return true
                case .orderedDescending: return false
                case .orderedSame: continue
                }
            }
            return false
        }
    }
}