我有一个TableViewController并且遇到了DetailViewController的问题。
在TableViewController中它可以工作但是当我点击一个Cell并调用时我收到错误“ - [__ NSArrayM objectAtIndex：]：索引0超出空数组的边界'”并且看起来数组是空的，但是我无法找出原因。 我将从下面的TableViewController类发布我的代码，希望它能帮助你找到我在这里做错了什么。
import UIKit
import Parse
import ParseUI
class MasterTableViewController: UITableViewController, PFLogInViewControllerDelegate, PFSignUpViewControllerDelegate {
var noteObjects: NSMutableArray! = NSMutableArray()
var currentObject: PFObject!
@IBOutlet weak var homePageTableView: UITableView!
var imageFiles = [PFFile]()
var imageText = [String]()
override func viewDidLoad() {
super.viewDidLoad()
var query = PFQuery(className: "Posts")
query.orderByDescending("createdAt")
query.findObjectsInBackgroundWithBlock{
(posts: [AnyObject]?, error: NSError?) -> Void in
if error == nil{
// success fetching objects
for post in posts!{
self.imageFiles.append(post["imageFile"] as! PFFile)
self.imageText.append(post["title"] as! String)
}
// reload the table
self.homePageTableView.reloadData()
}else{
print(error)
}
}
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Potentially incomplete method implementation.
// Return the number of sections.
return 1
}
/*** Table view begins ***/
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return imageText.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let singleCell: MasterTableViewCell = tableView.dequeueReusableCellWithIdentifier("cell") as! MasterTableViewCell
// title
singleCell.titleImageLabel.text = imageText[indexPath.row]
//images
imageFiles[indexPath.row].getDataInBackgroundWithBlock{(imageData: NSData?, error: NSError?) -> Void in
if imageData != nil{
let image = UIImage(data: imageData!)
singleCell.koiImageView.image = image
}else{
print(error)
}
}
return singleCell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.performSegueWithIdentifier("editNote", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "editNote") {
// get the new viewcontroller
var koiDetail = segue.destinationViewController as! AddNoteTableViewController
// pass selected object to the destination view controller
if let indexPath = self.tableView.indexPathForSelectedRow {
let row = Int(indexPath.row)
koiDetail.object = (noteObjects?[row] as! PFObject)
}
}
}
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
if (PFUser.currentUser() == nil) {
let logInViewController = PFLogInViewController()
logInViewController.delegate = self
let signUpViewController = PFSignUpViewController()
signUpViewController.delegate = self
logInViewController.signUpController = signUpViewController
self.presentViewController(logInViewController, animated: true, completion: nil)
}else {
self.fetchAllObjectsFromLocalDatastore()
self.fetchAllObjects()
}
}
func fetchAllObjectsFromLocalDatastore() {
let query: PFQuery = PFQuery(className: "Werte")
query.fromLocalDatastore()
query.orderByDescending("createdAt")
query.whereKey("username", equalTo: PFUser.currentUser().username)
query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
if (error == nil) {
let temp: NSArray = objects as NSArray
self.noteObjects = temp.mutableCopy() as! NSMutableArray
self.tableView.reloadData()
}else {
print(error.userInfo)
}
}
}
func fetchAllObjects() {
PFObject.unpinAllObjectsInBackgroundWithBlock(nil)
let 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 {
print(error.userInfo)
}
}
}
// MARK: - 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 error: NSError!) {
print("Failed to log in...")
}
func signUpViewController(signUpController: PFSignUpViewController!, shouldBeginSignUp info: [NSObject : AnyObject]!) -> Bool {
if let password = info?["password"] as? String {
return password.utf16.count >= 8
}
return false
}
func signUpViewController(signUpController: PFSignUpViewController!, didSignUpUser user: PFUser!) {
self.dismissViewControllerAnimated(true, completion: nil)
}
func signUpViewController(signUpController: PFSignUpViewController!, didFailToSignUpWithError error: NSError!) {
print("Failed to sign up...")
}
func signUpViewControllerDidCancelSignUp(signUpController: PFSignUpViewController!) {
print("User dismissed sign up.")
}
}