osx - How to get the correct callback value for NSUndoManager in Swift? -

osx - How to get the correct callback value for NSUndoManager in Swift? -

i have nsdocument subclass, hooked nsarraycontroller. reference, i'm trying translate illustration chapter 9 of cocoa programming mac os x 4th edition.

it seems this question asked before, need utilize object-based undo nsundomanager. in order pass 2 values method beingness invoked, i'm packaging them nsobject subclass 2 instance variables.

when kvo methods inserting , deleting employees array called clicking on buttons in application, work expected.

however, when removeobjectfromemployeesatindex called during undo operation, index passed in wildly out of bounds (for first row, seems 55, after index increases thousands next few rows).

how can right index perform undo action?

class document: nsdocument { var employee_list: array<person> = [] var employees: array<person> { { homecoming self.employee_list } set { if newvalue == self.employee_list { homecoming } self.employee_list = newvalue } } func insertobject(person: person, inemployeesatindex index: int) { self.undomanager.registerundowithtarget(self, selector: selector("removeobjectfromemployeesatindex:"), object: index) if (!self.undomanager.undoing) { self.undomanager.setactionname("add person") } employees.insert(person, atindex: index) } func removeobjectfromemployeesatindex(index: int) { allow person = self.employees[index] allow pair = personindexpair(person: person, index: index) self.undomanager.registerundowithtarget(self, selector: selector("insertpersonindexpair:"), object: pair) if (!self.undomanager.undoing) { self.undomanager.setactionname("remove person") } employees.removeatindex(index) } func insertpersonindexpair(pair: personindexpair) { insertobject(pair.person, inemployeesatindex: pair.index) } }

edit: i've worked around issue passing string, seems pretty obtuse:

self.undomanager.registerundowithtarget(self, selector: selector("removeobjectfromemployeesatstringindex:"), object: string(index)) //... func removeobjectfromemployeesatstringindex(index: string) { if allow = index.toint() { removeobjectfromemployeesatindex(i) } }

use nsnumber instead of int.

class="lang-swift prettyprint-override">self.undomanager.registerundowithtarget(self, selector:selector("removeobjectfromemployeesatstringindex:"), object: nsnumber(integer: index)) //... func removeobjectfromemployeesatstringindex(index: nsnumber) { removeobjectfromemployeesatindex(index.integervalue) }

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