Ios_sn_coredata (b)

The previous article is about how to carry out the basic operation of CoreData, this article is about Nsfetchedresultscontroller get CoreData data how with tableview perfect combination, and animation operation implementation.

The combination of the results of Nsfetchedresultscontroller and TableView

-(Nsinteger) Numberofsectionsintableview: (UITableView *) TableView {    return [[self.querydata sections] count];} -(Nsinteger) TableView: (UITableView *) Table numberofrowsinsection: (nsinteger) Section {    if ([[Self.querydata Sections] Count] > 0) {        id <NSFetchedResultsSectionInfo> sectioninfo = [[self.querydata sections] Objectatindex:section];        return [Sectioninfo numberofobjects];    } else        return 0;}

　　

Implementation of Nsfetchedresultscontrollerdelegate Proxy method

The method by which the data in the CoreData will change the call

-(void) Controllerwillchangecontent: (Nsfetchedresultscontroller *) Controller {        //The fetch controller is about to Start sending change notifications, so prepare the table view for updates.    [Self.tableview beginupdates];}

CoreData the method of changing calls in the row data can implement some animations when the data changes

-(void) Controller: (Nsfetchedresultscontroller *) controller didchangeobject: (ID) anobject Atindexpath: (Nsindexpath * ) Indexpath Forchangetype: (nsfetchedresultschangetype) type Newindexpath: (Nsindexpath *) Newindexpath {UITableView *t        Ableview = Self.tableview; Switch (type) {case Nsfetchedresultschangeinsert: [TableView insertrowsatindexpaths:@[newind            Expath] withrowanimation:uitableviewrowanimationright];                    Break Case Nsfetchedresultschangedelete: [TableView Deleterowsatindexpaths:@[indexpath] Withrowanimation:uitableviewr            Owanimationbottom];                    Break Case nsfetchedresultschangeupdate: [TableView Reloadrowsatindexpaths:@[indexpath] Withrowanimation:uitableviewr            Owanimationleft];                    Break Case Nsfetchedresultschangemove: [TableView Deleterowsatindexpaths:@[indexpath] Withrowanimation:uitableviewrow            Animationautomatic]; [tabLeview Insertrowsatindexpaths:@[newindexpath] withrowanimation:uitableviewrowanimationautomatic];    Break }}

The method that is called when the data in the CoreData group is changed can also implement some animations

-(void) Controller: (Nsfetchedresultscontroller *) controller didchangesection: (ID <nsfetchedresultssectioninfo >) sectioninfo atindex: (nsuinteger) Sectionindex Forchangetype: (nsfetchedresultschangetype) type{    switch ( Type) {case                    Nsfetchedresultschangeinsert:            [Self.tableview insertsections:[nsindexset Indexsetwithindex: Sectionindex] withrowanimation:uitableviewrowanimationautomatic];            break;        Case Nsfetchedresultschangemove: Break            ;        Case nsfetchedresultschangeupdate: Break            ;        Case Nsfetchedresultschangedelete:            [Self.tableview deletesections:[nsindexset Indexsetwithindex:sectionindex] Withrowanimation:uitableviewrowanimationautomatic];            break;    }}

Method called when data in CoreData has changed

-(void) Controllerdidchangecontent: (Nsfetchedresultscontroller *) Controller {    self.datalist = self.queryData.fetchedObjects.mutableCopy;    NSLog (@ "%@", self.datalist);    [Self.tableview endupdates];}

　　

Ios_sn_coredata using Demo

Ios_sn_coredata (b)