我这辈子都弄不明白为什么 didSelectRowAtIndexPath 方法不起作用。我已经尝试了所有我能想到的。
此时，我实际上只是在尝试在按下单元格时将字符串记录到控制台。谢谢。
import UIKit
import CoreData
class TableViewController: UIViewController, UITableViewDataSource, NSFetchedResultsControllerDelegate, UITableViewDelegate {
struct TableViewConstants {
static let cellIdentifier = "Cell"
}
var frc:NSFetchedResultsController!
var managedObjectContext:NSManagedObjectContext? {
return (UIApplication.sharedApplication().delegate as AppDelegate).managedObjectContext
}
let fetchRequest = NSFetchRequest(entityName: "Shortcut")
let shortcutSort = NSSortDescriptor(key: "shortcut", ascending: false)
var refreshControl:UIRefreshControl?
func handleRefresh(paramSender: AnyObject) {
let popTime = dispatch_time(DISPATCH_TIME_NOW, Int64(NSEC_PER_SEC))
dispatch_after(popTime, dispatch_get_main_queue(), {
self.refreshControl!.endRefreshing()
})
}
var tableView: UITableView?
override func viewDidLoad() {
super.viewDidLoad()
fetchRequest.sortDescriptors = [shortcutSort]
frc = NSFetchedResultsController(fetchRequest: fetchRequest, managedObjectContext: managedObjectContext!, sectionNameKeyPath: nil, cacheName: nil)
frc.delegate = self
var fetchingError:NSError?
if frc.performFetch(&fetchingError) {
println("Successful fetch...")
} else {
println("Failed fetch...")
}
tableView = UITableView(frame: view.bounds, style: .Plain)
if let theTableView = tableView {
theTableView.registerClass(UITableViewCell.classForCoder(), forCellReuseIdentifier:"identifier")
theTableView.dataSource = self
theTableView.autoresizingMask = .FlexibleWidth | .FlexibleHeight
refreshControl = UIRefreshControl()
refreshControl!.addTarget(self, action: "handleRefresh:", forControlEvents: .ValueChanged)
theTableView.addSubview(refreshControl!)
view.addSubview(theTableView)
}
//...
// performSegueWithIdentifier("View", sender: nil)
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func controllerWillChangeContent(controller: NSFetchedResultsController) {
tableView?.beginUpdates()
}
func controller(controller: NSFetchedResultsController!, didChangeObject anObject: AnyObject!, atIndexPath indexPath: NSIndexPath!, forChangeType type: NSFetchedResultsChangeType, newIndexPath: NSIndexPath!) {
if type == .Delete {
tableView?.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
} else if type == .Insert {
tableView?.insertRowsAtIndexPaths([indexPath], withRowAnimation: .Automatic)
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section:Int) -> Int {
let sectionInfo = frc.sections![section] as NSFetchedResultsSectionInfo
return sectionInfo.numberOfObjects
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("identifier", forIndexPath: indexPath) as UITableViewCell
let shortcut = frc.objectAtIndexPath(indexPath) as Shortcut
cell.textLabel.text = shortcut.shortcut
//...
return cell
}
func tableView(tableView: UITableView!, didSelectRowAtIndexPath indexPath: NSIndexPath!) {
let alert = UIAlertController(title: "Item selected", message: "You selected item \(indexPath.row)", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Cancel, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
func tableView(tableView: UITableView!, editingStyleForRowAtIndexPath indexPath: NSIndexPath!) -> UITableViewCellEditingStyle {
return .Delete
}
override func setEditing(editing: Bool, animated: Bool) {
super.setEditing(editing, animated: animated)
tableView!.setEditing(editing, animated: animated)
}
func tableView(tableView: UITableView!, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath!) {
if editingStyle == .Delete {
let shortcutToDelete = self.frc.objectAtIndexPath(indexPath) as Shortcut
managedObjectContext!.deleteObject(shortcutToDelete)
if shortcutToDelete.deleted {
var savingError:NSError?
if managedObjectContext!.save(&savingError) {
println("Object deleted...")
} else {
if let error = savingError {
println("Error: \(error)")
}
}
}
}
}
/*func editTableViewRows() {
}*/
func controllerDidChangeContent(controller: NSFetchedResultsController) {
tableView?.endUpdates()
}
override func prefersStatusBarHidden() -> Bool {
return true
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
最佳答案
您忘记将 UITableViewDelegate 分配给 UITableView:
theTableView.delegate = self
尝试在theTableView.dataSource = self下面赋值
关于将 NSFetchedResultsControllerDelegate 与核心数据一起使用时，iOS Swift 的 didSelectRowAtIndexPath 方法未触发？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/26600385/