Sorting Using Multiple Criteria ( Swift )

self.trialCores = screen.trialCores.sorted {
            if $0.tag != $1.tag {
                return $0.tag < $1.tag
            } else {
                return $0.direction.count < $1.direction.count
            }
        }

 

let sortedContacts = contacts.sort {
    if $0.lastName != $1.lastName { // first, compare by last names
        return $0.lastName < $1.lastName
    }
    /*  last names are the same, break ties by foo
    else if $0.foo != $1.foo {
        return $0.foo < $1.foo
    }
    ... repeat for all other fields in the sorting
    */
    else { // All other fields are tied, break ties by last name
        return $0.firstName < $1.firstName
    }
}

 

 

출처: https://stackoverflow.com/questions/37603960/swift-sort-array-of-objects-with-multiple-criteria