swift - CoreData - PickerView updating a tableView -
look code:
models:
import foundation import coredata class trainingdetails: nsmanagedobject { @nsmanaged var exercisename: string @nsmanaged var repsnumber: string @nsmanaged var setsnumber: string @nsmanaged var trainingday: trainingday } and
import foundation import coredata class trainingday: nsmanagedobject { @nsmanaged var day: string @nsmanaged var dayindex: nsnumber @nsmanaged var trainingdetails: nsset } and function here:
func pickerview(pickerview: uipickerview, didselectrow row: int, incomponent component: int) { let currentday = daysarray[row] let fetchrequest = nsfetchrequest(entityname: "trainingdetails") let predicate = nspredicate(format: "trainingday.day == %@", currentday) fetchrequest.predicate = predicate let sort = nssortdescriptor(key: "exercisename", ascending: true) fetchrequest.sortdescriptors = [sort] detailsarray = (moc!.executefetchrequest(fetchrequest, error: nil) as? [trainingdetails])! exercisetableview.reloaddata() } now, can see, have pickerview should update tableview everytime selected different option inside it, that's not happening. know instead of let currentday = daysarray[row] should attribute fetchedresultscontroller coredata currentday, try update tableview.
my question is: right think this? how do it?
i'm new swift, love examples on how it.
thanks in advance!!
update -> full code
import uikit import coredata class exerciseviewcontroller: uiviewcontroller, uitableviewdelegate, uitableviewdatasource, uipickerviewdatasource, uipickerviewdelegate, nsfetchedresultscontrollerdelegate { override func viewdidload() { super.viewdidload() vdl() //sets stepper configs setsstepper.wraps = false setsstepper.autorepeat = true setsstepper.continuous = true setsstepper.tintcolor = uicolor.redcolor() setsstepper.minimumvalue = 0 setsstepper.maximumvalue = 500 setsstepper.value = 0 //reps stepper configs repsstepper.wraps = false repsstepper.autorepeat = true repsstepper.continuous = true repsstepper.tintcolor = uicolor.orangecolor() repsstepper.minimumvalue = 0 repsstepper.maximumvalue = 500 repsstepper.value = 0 exercisetableview.reloaddata() } var moc = (uiapplication.sharedapplication().delegate as! appdelegate).managedobjectcontext var fetchedresultscontroller: nsfetchedresultscontroller? @iboutlet var exercisetableview: uitableview! @iboutlet var dayspickerview: uipickerview! @iboutlet var exercisename: uitextfield! @iboutlet var setsstepper: uistepper! @iboutlet var repsstepper: uistepper! @iboutlet var setsnumber: uilabel! @iboutlet var repsnumber: uilabel! var daysarray = [trainingday]() var detailsarray = [trainingdetails]() func vdl () { let fetchrequest = nsfetchrequest(entityname: "trainingday") let sort = nssortdescriptor(key: "dayindex", ascending: true) fetchrequest.sortdescriptors = [sort] daysarray = (moc!.executefetchrequest(fetchrequest, error: nil) as? [trainingday])! if daysarray.count == 0 { // nothing there let dayentity = nsentitydescription.entityforname("trainingday", inmanagedobjectcontext: moc!) let days = ["sunday", "monday", "tuesday", "wednesday", "thursday", "friday", "saturday"] (index, name) in enumerate(days) { let newday = trainingday(entity: dayentity!, insertintomanagedobjectcontext: moc) newday.day = name newday.dayindex = index daysarray.append(newday) println("name: \(newday.day) index: \(newday.dayindex)") } var error: nserror? moc!.save(&error) } } func appendtrainingdetailstoarray () { let row = dayspickerview.selectedrowincomponent(0) let currentday = daysarray[row] let detailsentity = nsentitydescription.entityforname("trainingdetails", inmanagedobjectcontext: moc!) let trainingdetails = trainingdetails(entity: detailsentity!, insertintomanagedobjectcontext: moc) trainingdetails.exercisename = exercisename.text trainingdetails.repsnumber = repsnumber.text! trainingdetails.setsnumber = setsnumber.text! trainingdetails.trainingday = currentday var error: nserror? moc?.save(&error) if let err = error { var status = err.localizedfailurereason println("\(status)") } else { println("current setting: \(trainingdetails.trainingday)") } } func fetchtrainingdetails() -> nsfetchrequest { let fetchrequest = nsfetchrequest(entityname: "trainingdetails") fetchrequest.predicate = nil let sortdescriptor = nssortdescriptor(key: "trainingday", ascending: true) fetchrequest.sortdescriptors = [sortdescriptor] fetchrequest.fetchbatchsize = 20 return fetchrequest } @ibaction func donebutton(sender: anyobject) { appendtrainingdetailstoarray() fetchedresultscontroller = nsfetchedresultscontroller(fetchrequest: fetchtrainingdetails(), managedobjectcontext: moc!, sectionnamekeypath: nil, cachename: nil) fetchedresultscontroller?.delegate = self fetchedresultscontroller?.performfetch(nil) exercisetableview.reloaddata() } @ibaction func setsstepperaction(sender: uistepper) { println("\(int(sender.value))") setsnumber.text = int(sender.value).description } @ibaction func repsstepper(sender: uistepper) { println("\(int(sender.value))") repsnumber.text = int(sender.value).description } func numberofsectionsintableview(tableview: uitableview) -> int { return fetchedresultscontroller?.sections?.count ?? 0 } func tableview(tableview: uitableview, numberofrowsinsection section: int) -> int { return fetchedresultscontroller?.sections?[section].numberofobjects ?? 0 } func tableview(tableview: uitableview, cellforrowatindexpath indexpath: nsindexpath) -> uitableviewcell { let cell = tableview.dequeuereusablecellwithidentifier("exercisecell", forindexpath: indexpath) as! uitableviewcell let details = fetchedresultscontroller!.objectatindexpath(indexpath) as! trainingdetails cell.textlabel!.text = "\(details.exercisename)" cell.detailtextlabel!.text = "sets: #\(details.setsnumber) reps: #\(details.repsnumber)" return cell } func tableview(tableview: uitableview, caneditrowatindexpath indexpath: nsindexpath) -> bool { if self.fetchedresultscontroller == nil { return false } else { return true } } func tableview(tableview: uitableview, commiteditingstyle editingstyle: uitableviewcelleditingstyle, forrowatindexpath indexpath: nsindexpath) { println("section , row \(indexpath.section) \(indexpath.row) ") if self.fetchedresultscontroller == nil { println("error when trying delete object managed object") } else if (editingstyle == uitableviewcelleditingstyle.delete) { switch editingstyle { case .delete: moc?.deleteobject(fetchedresultscontroller?.objectatindexpath(indexpath) as! trainingdetails) moc?.save(nil) case .insert: break case .none: break } } } //picker view delegate , datasource methods func numberofcomponentsinpickerview(pickerview: uipickerview) -> int { return 1 } func pickerview(pickerview: uipickerview, numberofrowsincomponent component: int) -> int { return daysarray.count } func pickerview(pickerview: uipickerview, titleforrow row: int, forcomponent component: int) -> string! { let trainingday = daysarray[row] return trainingday.day } func pickerview(pickerview: uipickerview, didselectrow row: int, incomponent component: int) { let currentday = daysarray[row] let fetchrequest = nsfetchrequest(entityname: "trainingdetails") let predicate = nspredicate(format: "trainingday.day == %@", currentday) fetchrequest.predicate = predicate let sort = nssortdescriptor(key: "exercisename", ascending: true) fetchrequest.sortdescriptors = [sort] detailsarray = (moc!.executefetchrequest(fetchrequest, error: nil) as? [trainingdetails])! exercisetableview.reloaddata() } // mark: nsfetchedresultscontrollerdelegate func controllerwillchangecontent(controller: nsfetchedresultscontroller) { self.exercisetableview.beginupdates() } func controller(controller: nsfetchedresultscontroller, didchangeobject anobject: anyobject, atindexpath indexpath: nsindexpath?, forchangetype type: nsfetchedresultschangetype, newindexpath: nsindexpath?) { switch type { case nsfetchedresultschangetype.insert: // note insert, insert row @ __newindexpath__ if let insertindexpath = newindexpath { self.exercisetableview.insertrowsatindexpaths([insertindexpath], withrowanimation: uitableviewrowanimation.fade) } case nsfetchedresultschangetype.delete: // note delete, delete row @ __indexpath__ if let deleteindexpath = indexpath { self.exercisetableview.deleterowsatindexpaths([deleteindexpath], withrowanimation: uitableviewrowanimation.fade) } case nsfetchedresultschangetype.update: // note update, update row @ __indexpath__ if let updateindexpath = indexpath { let cell = self.exercisetableview.cellforrowatindexpath(updateindexpath) let details = self.fetchedresultscontroller!.objectatindexpath(updateindexpath) as? trainingdetails cell!.textlabel!.text = "\(details!.exercisename)" cell!.detailtextlabel!.text = "sets: #\(details!.setsnumber) reps: #\(details!.repsnumber)" } case nsfetchedresultschangetype.move: // note move, delete row @ __indexpath__ if let deleteindexpath = indexpath { self.exercisetableview.deleterowsatindexpaths([deleteindexpath], withrowanimation: uitableviewrowanimation.fade) } // note move, insert row @ __newindexpath__ if let insertindexpath = newindexpath { self.exercisetableview.insertrowsatindexpaths([insertindexpath], withrowanimation: uitableviewrowanimation.fade) } } } func controller(controller: nsfetchedresultscontroller, didchangesection sectioninfo: nsfetchedresultssectioninfo, atindex sectionindex: int, forchangetype type: nsfetchedresultschangetype) { switch type { case .insert: let sectionindexset = nsindexset(index: sectionindex) self.exercisetableview.insertsections(sectionindexset, withrowanimation: uitableviewrowanimation.fade) case .delete: let sectionindexset = nsindexset(index: sectionindex) self.exercisetableview.deletesections(sectionindexset, withrowanimation: uitableviewrowanimation.fade) default: "" } } func controllerdidchangecontent(controller: nsfetchedresultscontroller) { exercisetableview.endupdates() } }
so, need change fetch request associated fetchedresultscontroller, , invoke performfetch() on it, , reload table view. in
func pickerview(pickerview: uipickerview, didselectrow row: int, incomponent component: int) { let currentday = daysarray[row] //update fetch request related fetchedresultscontroller.fetchrequest table view controller uses data let fetchrequest = fetchedresultscontroller.fetchrequest let predicate = nspredicate(format: "trainingday.day == %@", currentday) fetchrequest.predicate = predicate let sort = nssortdescriptor(key: "exercisename", ascending: true) fetchrequest.sortdescriptors = [sort] //perform fetch afresh fetchedresultscontroller.performfetch(nil); //now reload table view exercisetableview.reloaddata() } refer: documentation
modifying fetch request cannot change fetch request modify results. if want change fetch request, must:
if using cache, delete (using deletecachewithname:).
typically should not use cache if changing fetch request.
change fetch request.
invoke performfetch:.
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