ios - How to compare fetched ObjectID with string? -


i have view controller shows details of item in core data. specific item passed controller previous controller.

here basic code:

class itemdetailviewcontroller: uiviewcontroller, uitableviewdelegate, uitableviewdatasource{  @iboutlet weak var itemlabel: uilabel!  var selecteditemobjectid:string!          override func viewdidappear(animated: bool) {                  //fetch the list of items context                 var appdel:appdelegate = (uiapplication.sharedapplication().delegate as! appdelegate)                 var request = nsfetchrequest(entityname: "item")                 var context:nsmanagedobjectcontext = appdel.managedobjectcontext!                 var error: nserror?                 var results:nsarray = context.executefetchrequest(request, error: &error)!                  //optional, avoids potential compiler error                 request.returnsobjectsasfaults = false                  if (results.count > 0) {                     fetchresult in results {                         println("populating details page...")                         println("fetchresult.objectid \(fetchresult.objectid)")                         println("selecteditemobjectid \(selecteditemobjectid)")                         //if array entry matches data passed us, populate item details screen                         if (fetchresult.objectid  == selecteditemobjectid) {                              itemlabel.text = fetchresult.valueforkey("itemname") as? string                          } else {                     println("no items in database...")                 }             }

the problem having that, eyes, both of objectid's compare each other same. yet if statement not triggered , itemlabel.text never changed. here output when loop iterates through 1 should match:

populating details page... fetchresult.objectid 0xd000000000080000 <x-coredata://5f0ae77f-a83a-41bc-9361-0de37f120776/item/p2> selecteditemobjectid 0xd000000000080000 <x-coredata://5f0ae77f-a83a-41bc-9361-0de37f120776/item/p2>

they same! if statement formed wrong? going using objectid's wrong way?

i figured out. in if comparison, needed use fetchresult.fetchresult.objectid.description instead of fetchresult.fetchresult.objectid.

see corrected code below:

class itemdetailviewcontroller: uiviewcontroller, uitableviewdelegate, uitableviewdatasource{  @iboutlet weak var itemlabel: uilabel!  var selecteditemobjectid:string!          override func viewdidappear(animated: bool) {                  //fetch the list of items context                 var appdel:appdelegate = (uiapplication.sharedapplication().delegate as! appdelegate)                 var request = nsfetchrequest(entityname: "item")                 var context:nsmanagedobjectcontext = appdel.managedobjectcontext!                 var error: nserror?                 var results:nsarray = context.executefetchrequest(request, error: &error)!                  //optional, avoids potential compiler error                 request.returnsobjectsasfaults = false                  if (results.count > 0) {                     fetchresult in results {                         println("populating details page...")                         println("fetchresult.objectid \(fetchresult.objectid)")                         println("selecteditemobjectid \(selecteditemobjectid)")                         //if array entry matches data passed us, populate item details screen                         if (fetchresult.objectid.description  == selecteditemobjectid) {                              itemlabel.text = fetchresult.valueforkey("itemname") as? string                          } else {                     println("no items in database...")                 }             }

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