1、CoreData使用
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import UIKit
import CoreData
class CoreDataManager: NSObject {
static let coreDataManager :CoreDataManager = CoreDataManager()
lazy var applicationDocumentsDirectory: NSURL = {
// The directory the application uses to store the Core Data store file. This code uses a directory named "com.pixolity.ios.coredata" in the application's documents Application Support directory.
let urls = NSFileManager.defaultManager().URLsForDirectory(.DocumentDirectory,inDomains: .UserDomainMask)
print("\(urls[urls.count-1])")
return urls[urls.count-1] as NSURL
}()
lazy var managedObjectModel: NSManagedObjectModel = {
// The managed object model for the application. This property is not optional. It is a fatal error for the application not to be able to find and load its model.
let modelURL = NSBundle.mainBundle().URLForResource("Model",withExtension: "momd")!
return NSManagedObjectModel(contentsOfURL: modelURL)!
}()
lazy var persistentStoreCoordinator: NSPersistentStoreCoordinator? = {
// The persistent store coordinator for the application. This implementation creates and return a coordinator,having added the store for the application to it. This property is optional since there are legitimate error conditions that could cause the creation of the store to fail.
// Create the coordinator and store
var coordinator: NSPersistentStoreCoordinator? = NSPersistentStoreCoordinator(managedObjectModel: self.managedObjectModel)
let url = self.applicationDocumentsDirectory.URLByAppendingPathComponent("swift_demo.sqlite")
var error: NSError? = nil
var failureReason = "There was an error creating or loading the application's saved data."
do {
try coordinator!.addPersistentStoreWithType(NSsqliteStoreType,configuration: nil,URL: url,options: nil)
} catch var error1 as NSError {
error = error1
coordinator = nil
// Report any error we got.
var dict = [String: AnyObject]()
dict[NSLocalizedDescriptionKey] = "Failed to initialize the application's saved data"
dict[NSLocalizedFailureReasonErrorKey] = failureReason
dict[NSUnderlyingErrorKey] = error
error = NSError(domain: "YOUR_ERROR_DOMAIN",code: 9999,userInfo: dict)
// Replace this with code to handle the error appropriately.
// abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application,although it may be useful during development.
NSLog("Unresolved error \(error),\(error!.userInfo)")
abort()
} catch {
fatalError()
}
return coordinator
}()
lazy var managedObjectContext: NSManagedObjectContext = {
// Returns the managed object context for the application (which is already bound to the persistent store coordinator for the application.) This property is optional since there are legitimate error conditions that could cause the creation of the context to fail.
let coordinator = self.persistentStoreCoordinator
var managedObjectContext = NSManagedObjectContext(concurrencyType: .MainQueueConcurrencyType)
managedObjectContext.persistentStoreCoordinator = coordinator
return managedObjectContext
}()
// MARK: - Core Data Saving support
func saveContext () {
if managedObjectContext.hasChanges {
do {
try managedObjectContext.save()
} catch {
// Replace this implementation with code to handle the error appropriately.
// abort() causes the application to generate a crash log and terminate. You should not use this function in a shipping application,although it may be useful during development.
let nserror = error as NSError
NSLog("Unresolved error \(nserror),\(nserror.userInfo)")
abort()
}
}
}
}
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override func viewDidLoad() {
super.viewDidLoad()
let fetchRequst = NSFetchRequest(entityName: "Person")
let ageSort = NSSortDescriptor(key: "age",ascending: true)
let nameSort = NSSortDescriptor(key: "name",ascending: true)
fetchRequst.sortDescriptors = [ageSort,nameSort]
frc = NSFetchedResultsController(fetchRequest: fetchRequst,managedObjectContext: managerObjectContext!,sectionNameKeyPath: nil,cacheName: nil)
frc.delegate = self
do {
try frc.performFetch()
}catch let error as NSError{
print("performFetch error :\(error)")
}
self.tableView.tableFooterView = UIView(frame: CGRect(x: 0,y: 0,width: 0,height: 0))
}
实现 NSFetchedResultsController 代理方法
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func controllerWillChangeContent(controller: NSFetchedResultsController) {
self.tableView.beginUpdates()
}
func controller(controller: NSFetchedResultsController,didChangeObject anObject: AnyObject,atIndexPath indexPath: NSIndexPath?,forChangeType type: NSFetchedResultsChangeType,newIndexPath: NSIndexPath?) {
if(type == .Delete){
self.tableView.deleteRowsAtIndexPaths([indexPath!],withRowAnimation: .Automatic)
}else if type == .Insert{
self.tableView.insertRowsAtIndexPaths([newIndexPath!],withRowAnimation: .Automatic)
}
}
func controllerDidChangeContent(controller: NSFetchedResultsController) {
self.tableView.endUpdates()
}
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override func tableView(tableView: UITableView,numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation,return the number of rows
let sectionInfo = frc.sections![section] as NSFetchedResultsSectionInfo
return sectionInfo.numberOfObjects
}
override func tableView(tableView: UITableView,cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = UITableViewCell(style: .Subtitle,reuseIdentifier: TableViewConstants.cellIdentifier)
let person = frc.objectAtIndexPath(indexPath) as! Person
cell.textLabel!.text = "Name: \(person.name!)"
cell.detailTextLabel!.text = "Phone:\(person.phoneNum!)"
return cell
}
func newPerson()->Bool{
let managerObjectContext = CoreDataManager.coreDataManager.managedObjectContext
let newPerson = NSEntityDescription.insertNewObjectForEntityForName("Person",inManagedObjectContext: managerObjectContext) as? Person
if let person = newPerson {
person.name = self.nameTextField.text
if let phoneNum = Int(self.phoneTextfield.text!){
person.phoneNum = phoneNum
}
if let age = Int(self.ageTextfield.text!){
person.age = age
}
do{
try managerObjectContext.save()
return true
}catch let error as NSError{
print("Failed to save :\(error) ")
}
}else{
print("Failed to creat new person")
}
return false
}
