The use of Swift's protocol in Cocoa Collection (i)

protocol Reusable:class {static var reuseindentifier:string {get} static var nib:uinib? {Get}}extension Reusable {static var reuseindentifier:string {return String (self)} static var nib:uinib? {return nil}}Extension UITableView {func Registerreusablecell<t:uitableviewcell where t:reusable> (_: T.type) {i            F Let nib = t.nib {self.registernib (nib, forcellreuseidentifier:t.reuseindentifier)}else { Self.registerclass (T.self, Forcellreuseidentifier:t.reuseindentifier)}} func dequeuereusablecell< T:uitableviewcell where T:reusable> (Indexpath:nsindexpath), T {return Self.dequeuereusablecellwithiden Tifier (T.reuseindentifier, Forindexpath:indexpath) as!        T} func Registerreusableheaderfooterview<t:uitableviewheaderfooterview where T:reusable> (_: T.Type) {        If let nib = t.nib {self.registernib (nib, Forheaderfooterviewreuseidentifier:t.reuseindentifier)        } else {Self.registerclass (t.self, Forheaderfooterviewreuseidentifier:t.reuseindentifier)}} Func Dequeuereusableheaderfooterview<t:uitableviewheaderfooterview where t:reusablE> ()-T? {return Self.dequeuereusableheaderfooterviewwithidentifier (t.reuseindentifier) as!    T? }}class Jhtableviewcell:uitableviewcell, reusable {static var nib:uinib?        {return uinib (nibname:string (jhtableviewcell.self), Bundle:nil)} override func awakefromnib () { Super.awakefromnib ()} override Func setselected (Selected:bool, Animated:bool) {super.setselected (select Ed, animated:animated)}}
Class Codebasedcustomcell:uitableviewcell, reusable {}

The use of Swift's protocol in Cocoa Collection (i)