ICYMI: Core Data at CMD+R 2014

https://github.com/QueryKit

Transcript

1. ICYMI:&Core&Data
   !@kylefuller
   

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2. !@kylefuller
   

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5. CoreData
   

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6. What%is%Core%Data?
   

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7. Framework)for)persistence)and)
   object)graph)management
   

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8. Database
   

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9. SQL$Wrapper$or$ORM
   

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11. Change'No*fica*on
    

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12. Key$Value$Observing
    

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13. RACObserve(person, "name").subscribeNext { name in
    println("Person's name did change to \(name).")
    }
    

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14. NSManagedObjectContextObjectsDidChangeNo5fica5on
    

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15. NSDeletedObjectsKey
    

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16. NSInsertedObjectsKey
    

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17. NSUpdatedObjectsKey
    

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18. Valida&on
    

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20. var name = "Kyle"
    var error:NSError?
    if person.validateValue(
    AutoreleasingUnsafeMutablePointer(&name),
    forKey:"name",
    error:&error)
    {
    println("\(name) is a valid name.")
    }
    

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21. Properga(on
    

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23. Migra&ons
    

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24. NSMigratePersistentStoresAutoma1callyOp1on
    

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25. class Person : NSManagedObject {¬
    var name:String
    + var birthdate:NSDate?
    }
    

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26. Components
    

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27. NSManagedObject
    

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28. class Person : NSManagedObject {
    var name:String
    }
    

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29. @objc(Person) class Person : NSManagedObject {
    @NSManaged var name:String
    }
    

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31. Mogenerator
    

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32. $ brew install mogenerator
    

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33. $ mogenerator --model=Model.xcdatamodeld
    --machine-dir=Model/Machine
    --human-dir=Model
    

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34. ├── Machine
    │ ├── _Organisation.swift
    │ └── _Person.swift
    ├── Organisation.swift
    └── Person.swift
    

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35. let person:NSManagedObject = ...;
    person.valueForKey("name")
    

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36. NSManagedObjectContext
    

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38. NSManagedObjectContext(concurrencyType)
    

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39. enum NSManagedObjectContextConcurrencyType : UInt {
    case ConfinementConcurrencyType
    case PrivateQueueConcurrencyType
    case MainQueueConcurrencyType
    }
    

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40. context.performBlock {
    }
    

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41. context.performBlockAndWait {
    }
    

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42. NSPersistentStoreCoordinator
    

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43. NSPersistentStore
    

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44. NSSQLiteStoreType
    

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45. let options = [
    NSPersistentStoreUbiquitousContentNameKey: "Posts"
    ]
    

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46. NSInMemoryStoreType
    

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47. Stack
    

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50. Performance
    

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55. Locking
    

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56. Write&Ahead&Locking
    

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58. Boilerplate
    

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59. KFData/Store
    

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61. Querying
    

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62. NSFetchRequest
    • predicate
    • sortDescriptors
    

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63. NSFetchRequest
    • predicate
    • sortDescriptors
    • fetchLimit
    • fetchOffset
    • fetchBatchSize
    • ...
    

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64. NSSortDescriptor
    NSSortDescriptor(key: "title", ascending: true)
    

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65. NSPredicate
    NSPredicate(format: "author == 'Kyle'")
    

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66. Every&Ar(cle
    

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67. Every&Ar(cle
    • Ordered&by&Title
    • Wri.en&Kyle
    

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68. let fetchRequest = NSFetchRequest(entityName: "Article")
    

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69. fetchRequest.sortDescriptors = [NSSortDescriptor(key: "title", ascending: true)]
    

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70. fetchRequest.predicate = NSPredicate(format: "author == 'Kyle'")
    

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71. var error:NSError?
    let articles = managedObjectContext.executeFetchRequest(fetchRequest, error: &error)
    

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72. let fetchRequest = NSFetchRequest(entityName: "Article")
    fetchRequest.sortDescriptors = [NSSortDescriptor(key: "title", ascending: true)]
    fetchRequest.predicate = NSPredicate(format: "author == 'Kyle'")
    var error:NSError?
    let articles = managedObjectContext.executeFetchRequest(fetchRequest, error: &error)
    

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73. let fetchRequest = NSFetchRequest(entityName: "Article")
    fetchRequest.sortDescriptors = [NSSortDescriptor(key: "title", ascending: true)]
    fetchRequest.predicate = NSPredicate(format: "author == 'Kyle'")
    var error:NSError?
    let articles = managedObjectContext.executeFetchRequest(fetchRequest, error: &error)
    if let error = error {
    println("Failed to execute fetch request: \(error)")
    } else {
    println("Success")
    }
    

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74. "Article"
    "title"
    "author == 'Kyle'"
    .
    

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76. let result = Article.queryset(context)
    .filter(Article.attributes.author == "Kyle")
    .orderBy(Article.attributes.title)
    

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78. Asyncronous)Fetching
    

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79. NSAsyncronousFetchRequest
    

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80. let request = NSAsyncronousFetchRequest(fetchRequest:fetchRequest) {
    result in
    }
    var error:NSError?
    managedObjectContext.executeRequest(request, &error)
    

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81. Fetched'Results'Controller
    

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82. // MARK: NSFetchedResultsControllerDelegate
    func controllerDidChangeContent(controller: NSFetchedResultsController) {
    tableView.reloadData()
    }
    // MARK: UITableViewDataSource
    func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    return fetchedResultsController.sections?.count
    }
    func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    let sectionInfo = fetchedResultsController.sections[section] as NSFetchedResultsSectionInfo
    return sectionInfo.numberOfObjects()
    }
    func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    return cell from managed object
    }
    

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83. func controllerWillChangeContent(controller: NSFetchedResultsController) {
    tableView.beginUpdates()
    }
    func controller(controller: NSFetchedResultsController, didChangeObject
    anObject: AnyObject, atIndexPath indexPath: NSIndexPath?, forChangeType type:
    NSFetchedResultsChangeType, newIndexPath: NSIndexPath?)
    {
    // Insert, reload or remove rows
    }
    func controllerDidChangeContent(controller: NSFetchedResultsController) {
    tableView.endUpdates()
    }
    

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84. Boilerplate
    

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85. - (instancetype)initWithTableView:(UITableView *)tableView fetchedResultsController:(NSFetchedResultsController *)fetchedResultsController {
    NSParameterAssert(tableView != nil);
    NSParameterAssert(fetchedResultsController != nil);
    if (self = [super init]) {
    _tableView = tableView;
    tableView.dataSource = self;
    _fetchedResultsController = fetchedResultsController;
    _fetchedResultsController.delegate = self;
    }
    return self;
    }
    - (instancetype)initWithTableView:(UITableView *)tableView managedObjectContext:(NSManagedObjectContext *)managedObjectContext fetchRequest:(NSFetchRequest *)fetchRequest sectionNameKeyPath:(NSString *)sectionNameKeyPath cacheName:(NSString *)cacheName {
    NSParameterAssert(managedObjectContext != nil);
    NSParameterAssert(fetchRequest != nil);
    NSFetchedResultsController *fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest managedObjectContext:managedObjectContext sectionNameKeyPath:sectionNameKeyPath cacheName:cacheName];
    return [self initWithTableView:tableView fetchedResultsController:fetchedResultsController];
    }
    - (NSManagedObjectContext *)managedObjectContext {
    return [_fetchedResultsController managedObjectContext];
    }
    - (NSFetchRequest *)fetchRequest {
    return [_fetchedResultsController fetchRequest];
    }
    - (BOOL)performFetch:(NSError **)error {
    BOOL result = [self.fetchedResultsController performFetch:error];
    [self.tableView reloadData];
    return result;
    }
    #pragma mark -
    - (id )sectionInfoForSection:(NSUInteger)section {
    return self.fetchedResultsController.sections[section];
    }
    - (id )objectAtIndexPath:(NSIndexPath *)indexPath {
    return [self sectionInfoForSection:indexPath.section].objects[indexPath.row];
    }
    #pragma mark - NSFetchedResultsControllerDelegate
    - (void)controllerWillChangeContent:(NSFetchedResultsController *)controller {
    [self.tableView beginUpdates];
    }
    - (void)controller:(NSFetchedResultsController *)controller didChangeSection:(id )sectionInfo atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type {
    NSIndexSet *indexSet = [NSIndexSet indexSetWithIndex:sectionIndex];
    switch(type) {
    case NSFetchedResultsChangeInsert:
    [self.tableView insertSections:indexSet withRowAnimation:UITableViewRowAnimationFade];
    break;
    case NSFetchedResultsChangeDelete:
    [self.tableView deleteSections:indexSet withRowAnimation:UITableViewRowAnimationFade];
    break;
    case NSFetchedResultsChangeUpdate:
    case NSFetchedResultsChangeMove:
    break;
    }
    }
    - (void)controller:(NSFetchedResultsController *)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath *)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath *)newIndexPath {
    switch(type) {
    case NSFetchedResultsChangeInsert:
    [self.tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
    break;
    case NSFetchedResultsChangeDelete:
    [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    break;
    case NSFetchedResultsChangeUpdate: {
    [self.tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
    break;
    }
    case NSFetchedResultsChangeMove:
    [self.tableView deleteRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationFade];
    [self.tableView insertRowsAtIndexPaths:@[newIndexPath] withRowAnimation:UITableViewRowAnimationFade];
    break;
    }
    }
    - (void)controllerDidChangeContent:(NSFetchedResultsController *)controller {
    [self.tableView endUpdates];
    }
    #pragma mark - UITableViewDataSource
    - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
    NSUInteger count = [self.fetchedResultsController.sections count];
    return (NSInteger)count;
    }
    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
    id sectionInfo = [self sectionInfoForSection:section];
    return (NSInteger)sectionInfo.numberOfObjects;
    }
    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    if (self.cellForManagedObject == nil) {
    NSString *reason = [NSString stringWithFormat:@"%@: You must override %@ or set %@", NSStringFromClass([self class]), NSStringFromSelector(@selector(tableView:cellForRowAtIndexPath:)), NSStringFromSelector(@selector(cellForManagedObject))];
    @throw [NSException exceptionWithName:NSInternalInconsistencyException reason:reason userInfo:nil];
    }
    NSManagedObject *managedObject = [self objectAtIndexPath:indexPath];
    return self.cellForManagedObject(tableView, indexPath, managedObject);
    }
    - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section {
    return [[self sectionInfoForSection:section] name];
    }
    - (NSString *)tableView:(UITableView *)tableView titleForFooterInSection:(NSInteger)section {
    return nil;
    }
    - (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
    switch (editingStyle) {
    case UITableViewCellEditingStyleDelete: {
    NSManagedObject *managedObject = [self objectAtIndexPath:indexPath];
    [self.managedObjectContext deleteObject:managedObject];
    NSError *error;
    if ([self.managedObjectContext save:&error] == NO) {
    NSLog(@"%@: Failed to save managed object context after deleting %@", NSStringFromClass([self class]), error);
    }
    break;
    }
    case UITableViewCellEditingStyleInsert:
    break;
    case UITableViewCellEditingStyleNone:
    break;
    }
    }
    

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86. UIKit&Data&Sources
    • Kyle&Fuller:&KFData/UI
    • Ash&Furrow:&UICollec8onView+NSFetchedResultsController
    • Sam&Soffes:&SSDataKit
    

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87. Debugging
    

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88. let viewController = CCLEntityListViewController(context)
    presentViewController(viewController, animated:true)
    

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90. !@kylefuller
    

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