在TableView上添加一个SearchBar
我想在我的tableview中添加一个search栏，里面填充了来自Core Data的数据。 下面是我的TableViewController的代码的一部分。 在tableview中放置一个后，如何开始执行search栏function？
let managedObjectContext = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext var fetchedLastName = [String]() var fetchedFirstName = [String]() var fetchedImage = [UIImage]() override func viewDidLoad() { super.viewDidLoad() NSNotificationCenter.defaultCenter().addObserver(self, selector: "reloadData:",name:"load", object: nil) let entityDescription = NSEntityDescription.entityForName("Faculty", inManagedObjectContext: managedObjectContext) let request = NSFetchRequest() request.entity = entityDescription do{ let objects = try managedObjectContext.executeFetchRequest(request) let results = objects if results.count > 0 { for var i = 0; i < results.count; i += 1{ let match = results[i] as! NSManagedObject fetchedLastName.append((match.valueForKey("lastname") as? String)!) fetchedFirstName.append((match.valueForKey("firstname") as? String)!) let image = match.valueForKey("image") as! NSData fetchedImage.append(UIImage(data: image)!) } } else { } } catch{} } func reloadData(notification: NSNotification){ fetchedLastName.removeAll() fetchedFirstName.removeAll() fetchedImage.removeAll() let entityDescription = NSEntityDescription.entityForName("Faculty", inManagedObjectContext: managedObjectContext) let request = NSFetchRequest() request.entity = entityDescription do{ let objects = try managedObjectContext.executeFetchRequest(request) let results = objects if results.count > 0 { for var i = 0; i < results.count; i += 1{ let match = results[i] as! NSManagedObject fetchedLastName.append((match.valueForKey("lastname") as? String)!) fetchedFirstName.append((match.valueForKey("firstname") as? String)!) let image = match.valueForKey("image") as! NSData fetchedImage.append(UIImage(data: image)!) } } else { } } catch{} self.tableView.reloadData() } override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCellWithIdentifier("TEACH", forIndexPath: indexPath) as! TEACHTableViewCell let row = indexPath.row print(fetchedFirstName) cell.facultyName.text = fetchedLastName[row] + ", " + fetchedFirstName[row] cell.facultyImage.image = fetchedImage[row] return cell } } 试试这个代码全部testing：
// // TEACHTableViewController.swift // TEACH // // Created by ICST340.N1 on 9/29/15. // Copyright © 2015 IyoTugs. All rights reserved. // import UIKit import CoreData class TEACHTableViewController: UITableViewController, UISearchBarDelegate, UISearchControllerDelegate, UISearchResultsUpdating { var searchController = UISearchController() var filteredTableData = [[String: AnyObject?]]() var tableData = [[String: AnyObject?]]() let managedObjectContext = (UIApplication.sharedApplication().delegate as! AppDelegate).managedObjectContext var fetchedLastName = [String]() var fetchedFirstName = [String]() var fetchedImage = [UIImage]() override func viewDidLoad() { super.viewDidLoad() //setup search controller searchController = UISearchController(searchResultsController: nil) searchController.searchResultsUpdater = self searchController.dimsBackgroundDuringPresentation = false searchController.delegate = self tableView.tableHeaderView = searchController.searchBar definesPresentationContext = true searchController.searchBar.sizeToFit() NSNotificationCenter.defaultCenter().addObserver(self, selector: "reloadData:",name:"load", object: nil) let entityDescription = NSEntityDescription.entityForName("Faculty", inManagedObjectContext: managedObjectContext) let request = NSFetchRequest() request.entity = entityDescription do{ let objects = try managedObjectContext.executeFetchRequest(request) let results = objects if results.count > 0 { for var i = 0; i < results.count; i += 1{ let match = results[i] as! NSManagedObject fetchedLastName.append((match.valueForKey("lastname") as? String)!) fetchedFirstName.append((match.valueForKey("firstname") as? String)!) //added this is convert the image let image = match.valueForKey("image") as! NSData let realImage = UIImage(data: image)! fetchedImage.append(UIImage(data: image)!) tableData.append(["firstName" : match.valueForKey("firstname"), "lastName" : match.valueForKey("firstname"), "image" : realImage]) } } else { } } catch{} // Uncomment the following line to preserve selection between presentations // self.clearsSelectionOnViewWillAppear = false // Uncomment the following line to display an Edit button in the navigation bar for this view controller. // self.navigationItem.rightBarButtonItem = self.editButtonItem() } func reloadData(notification: NSNotification){ fetchedLastName.removeAll() fetchedFirstName.removeAll() //Added this to remove all images fetchedImage.removeAll() tableData.removeAll() let entityDescription = NSEntityDescription.entityForName("Faculty", inManagedObjectContext: managedObjectContext) let request = NSFetchRequest() request.entity = entityDescription do{ let objects = try managedObjectContext.executeFetchRequest(request) let results = objects if results.count > 0 { for var i = 0; i < results.count; i += 1{ let match = results[i] as! NSManagedObject fetchedLastName.append((match.valueForKey("lastname") as? String)!) fetchedFirstName.append((match.valueForKey("firstname") as? String)!) //added this is convert the image let image = match.valueForKey("image") as! NSData let realImage = UIImage(data: image)! fetchedImage.append(UIImage(data: image)!) tableData.append(["firstName" : match.valueForKey("firstname"), "lastName" : match.valueForKey("firstname"), "image" : realImage]) } } else { } } catch{} self.tableView.reloadData() } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } // MARK: - Table view data source override func numberOfSectionsInTableView(tableView: UITableView) -> Int { // #warning Incomplete implementation, return the number of sections return 1 } override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int { // #warning Incomplete implementation, return the number of rows if searchController.active { return filteredTableData.count } else { return fetchedLastName.count } } override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCellWithIdentifier("TEACH", forIndexPath: indexPath) as! TEACHTableViewCell if searchController.active { let row = indexPath.row print(fetchedFirstName) let firstName = filteredTableData[row]["firstName"] as! String let lastName = filteredTableData[row]["lastName"] as! String let image = filteredTableData[row]["image"] as! UIImage cell.facultyName.text = lastName + ", " + firstName cell.facultyImage.image = image } else { let row = indexPath.row print(fetchedFirstName) cell.facultyName.text = fetchedLastName[row] + ", " + fetchedFirstName[row] cell.facultyImage.image = fetchedImage[row] } return cell } func filterContentForSearchText(searchText: String) { for singleTableData in tableData { let firstname = singleTableData["firstName"] as! String let lastname = singleTableData["lastName"] as! String let image = singleTableData["image"] as! UIImage print(firstname) print(lastname) if searchText != "" { if (firstname.rangeOfString(searchText) != nil) { filteredTableData.append(["firstName" : firstname, "lastName" : lastname, "image" : image]) } else if (lastname.rangeOfString(searchText) != nil) { filteredTableData.append(["firstName" : firstname, "lastName" : lastname, "image" : image]) } } else { filteredTableData.append(["firstName" : firstname, "lastName" : lastname, "image" : image]) } } } func updateSearchResultsForSearchController(searchController: UISearchController) { filteredTableData.removeAll() filterContentForSearchText(searchController.searchBar.text!) tableView.reloadData() }
}