我看到了类似的请求，但没有回应我的问题。我正在构建一个简单的应用笔记，但是当我登录时，保存在 Parse 上的数据会在 TableView 上出现几秒钟，然后消失。我究竟做错了什么？
谢谢你们
import UIKit
class MasterTableViewController: UITableViewController, PFLogInViewControllerDelegate, PFSignUpViewControllerDelegate {
var noteObjects: NSMutableArray! = NSMutableArray()
override func viewDidLoad() {
super.viewDidLoad()
// 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()
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
self.loginSetup()
}
// Parse - Login
func logInViewController(logInController: PFLogInViewController, shouldBeginLogInWithUsername username: String, password: String) -> Bool {
if (!username.isEmpty || !password.isEmpty) {
return true
} else {
return false
}
}
func logInViewController(logInController: PFLogInViewController, didLogInUser user: PFUser) {
self.dismissViewControllerAnimated( true, completion: nil )
}
func logInViewController(logInController: PFLogInViewController, didFailToLogInWithError: NSError?)
{
println("Faild to log in..")
}
// Parse - sign up
func signUpViewController(signUpController: PFSignUpViewController, shouldBeginSignUp info: [NSObject : AnyObject]) -> Bool {
if let password = info["password"] as? String {
return count(password.utf16) >= 8
} else {
return false
}
}
func signUpViewController(signUpController: PFSignUpViewController, didSignUpUser user: PFUser) {
self.dismissViewControllerAnimated(true, completion: nil)
}
func signUpViewController(signUpController: PFSignUpViewController, didFailToSignUpWithError error: NSError?) {
println("Faild to sign up")
}
func signUpViewControllerDidCancelSignUp(signUpController: PFSignUpViewController) {
println("User dismissed sign up")
}
// Parse - logout
@IBAction func logoutAction(sender: AnyObject) {
PFUser.logOut()
self.loginSetup()
}
func loginSetup() {
if (PFUser.currentUser() == nil) {
var logInViewController = PFLogInViewController()
logInViewController.delegate = self
var signUpViewController = PFSignUpViewController()
signUpViewController.delegate = self
logInViewController.signUpController = signUpViewController
self.presentViewController(logInViewController, animated: true, completion: nil)
}else {
self.fetchAllObjectsFromLocalDatastore()
self.fetchAllObjects()
}
}
/*
func fetchAllObjectsFromLocalDatastore() {
var query: PFQuery = PFQuery(className: "Note")
//query.cachePolicy = .CacheElseNetwork
query.fromLocalDatastore()
query.whereKey("username", equalTo: PFUser.currentUser()!.username!)
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
if (error == nil) {
if let objects = objects as? [PFObject] {
for object in objects {
println(object.objectId)
}
}
//var temp: PFObject = PFObject()
//self.noteObjects = temp.mutableCopy() as! NSMutableArray
//println(self.noteObjects)
self.tableView.reloadData()
}else {
println(error!.userInfo)
}
}
}
func fetchAllObjects() {
PFObject.unpinAllObjectsInBackgroundWithBlock(nil)
var query: PFQuery = PFQuery(className: "Note")
//query.cachePolicy = .CacheElseNetwork
query.whereKey("username", equalTo: PFUser.currentUser()!.username!)
query.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
if (error == nil) {
PFObject.pinAllInBackground(objects, block: nil)
self.fetchAllObjectsFromLocalDatastore()
}else {
println(error!.userInfo)
}
}
}
*/
func fetchAllObjectsFromLocalDatastore() {
var query: PFQuery = PFQuery(className: "Note")
query.fromLocalDatastore()
query.whereKey("username", equalTo: PFUser.currentUser()!.username!)
query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
if (error == nil) {
//var temp: NSArray = objects as! [NSArray]
var temp: NSArray = objects! as NSArray
self.noteObjects = temp.mutableCopy() as! NSMutableArray
self.tableView.reloadData()
}else {
println(error!.userInfo)
}
}
}
func fetchAllObjects() {
PFObject.unpinAllObjectsInBackgroundWithBlock(nil)
var query: PFQuery = PFQuery(className: "Note")
query.whereKey("username", equalTo: PFUser.currentUser()!.username!)
query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
if (error == nil) {
PFObject.pinAllInBackground(objects, block: nil)
self.fetchAllObjectsFromLocalDatastore()
}else {
println(error!.userInfo)
}
}
}
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 Potentially incomplete method implementation.
// Return the number of sections.
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return noteObjects!.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! MasterTableViewCell
var object: PFObject = self.noteObjects.objectAtIndex(indexPath.row) as! PFObject
cell.masterTitleLabel?.text = object["title"] as? String
cell.masterTextLabel?.text = object["text"] as? String
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.performSegueWithIdentifier("editNote", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
var upcoming: AddNoteTableViewController = segue.destinationViewController as! AddNoteTableViewController
if (segue.identifier == "editNote") {
let indexPath = self.tableView.indexPathForSelectedRow()!
var object: PFObject = self.noteObjects.objectAtIndex(indexPath.row) as! PFObject
upcoming.object = object;
self.tableView.deselectRowAtIndexPath(indexPath, animated: true)
}
}
/*
// Override to support conditional editing of the table view.
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// Return NO if you do not want the specified item to be editable.
return true
}
*/
/*
// Override to support editing the table view.
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
// Delete the row from the data source
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
} else if editingStyle == .Insert {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
*/
/*
// Override to support rearranging the table view.
override func tableView(tableView: UITableView, moveRowAtIndexPath fromIndexPath: NSIndexPath, toIndexPath: NSIndexPath) {
}
*/
/*
// Override to support conditional rearranging of the table view.
override func tableView(tableView: UITableView, canMoveRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// Return NO if you do not want the item to be re-orderable.
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.
}
*/
}