-1
我不斷收到一個錯誤說，發現零，同時展開可選值。我不知道爲什麼它會這樣做，因爲數據存儲到另一個視圖控制器的變量中，但它不會分配新值，而是保持爲零。它爲什麼這樣做？任何幫助將不勝感激謝謝。發現無，而力量解開一個可選的快速2
注：崩潰在線userEventViewController
的47個崩潰上線！myTitle.title =事件.NAME
鏈接到項目：https://www.dropbox.com/s/1d4d8opuxzpcuk4/TicketekApp.zip?dl=0
代碼：
源視圖控制器（EventTableViewController）：
// EventTableViewController.swift
import UIKit
class EventTableViewController: UITableViewController {
// MARK: Properties
var currentlySelectedIndex = 0
var events = [Event]()
var isAdmin: Bool = false
var currentUser: String = ""
override func viewDidLoad() {
super.viewDidLoad()
print(currentUser)
// Use the edit button item provided by the table view controller.
if isAdmin == true {
navigationItem.leftBarButtonItem = editButtonItem()
}
// Load any saved events, otherwise load sample data.
if let savedEvents = loadEvents() {
events += savedEvents
} else {
// Load the sample data.
loadSampleEvents()
}
}
func loadSampleEvents() {
let photo1 = UIImage(named: "event1")!
let event1 = Event(name: "ACDC", photo: photo1, rating: 4, price: 100.0, eventDescription: "AC/DC are an Australian hard rock band, formed in November 1973 by brothers Malcolm and Angus Young, who continued as members until Malcolm's illness and departure in 2014. Date of Event: 1/3/16", album: "Redemption Tour")!
let photo2 = UIImage(named: "event2")!
let event2 = Event(name: "Cold Play", photo: photo2, rating: 5, price: 150.0, eventDescription: "Coldplay are a British rock band formed in 1996 by lead vocalist Chris Martin and lead guitarist Jonny Buckland at University College London. Date of Event: 12/12/15", album: "Mylo Xyloto")!
let photo3 = UIImage(named: "event3")!
let event3 = Event(name: "One Direction", photo: photo3, rating: 3, price: 120.0, eventDescription: "One Direction are an English-Irish pop boy band based in London, composed of Niall Horan, Liam Payne, Harry Styles, Louis Tomlinson, and previously, Zayn Malik until his departure from the band on 25 March 2015. Date of Event: 5/9/16", album: "Made in the A.M.")!
events += [event1, event2, event3]
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return events.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
// Table view cells are reused and should be dequeued using a cell identifier.
let cellIdentifier = "EventTableViewCell"
let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! EventTableViewCell
// Fetches the appropriate event for the data source layout.
let event = events[indexPath.row]
cell.nameLabel.text = event.name
cell.photoImageView.image = event.photo
cell.ratingControl.rating = event.rating
cell.priceLabel.text = event.album
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
//Record the row selected
currentlySelectedIndex = indexPath.row
//check for admin
if isAdmin == true {
performSegueWithIdentifier("eventViewControllerSegue", sender: self)
} else {
performSegueWithIdentifier("userEventViewControllerSegue", sender: self)
}
}
// Override to support conditional editing of the table view.
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
// Return false if you do not want item to be editable.
if isAdmin == true {
return true
} else {
return false
}
}
// Override to support editing the table view.
override func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if isAdmin == true {
if editingStyle == .Delete {
// Delete the row from the data source
events.removeAtIndex(indexPath.row)
saveEvents()
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
} else if editingStyle == .Insert {
// Create new instance of class, add to the array, and add a new row to the table
}
}
}
/*
// 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 false if you do not want the item to be re-orderable.
if isAdmin == true {
return true
} else {
return false
}
}
// MARK: - Navigation
// preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "eventViewControllerSegue" {
let destinationVC1 = segue.destinationViewController as? EventViewController
destinationVC1!.event = events[currentlySelectedIndex]
} else if segue.identifier == "userEventViewControllerSegue" {
let eventDetailViewController = segue.destinationViewController as! UserEventViewController
//Get the associated event
eventDetailViewController.event = events[currentlySelectedIndex]
let destinationVC = segue.destinationViewController as? UserEventViewController
destinationVC!.event = events[currentlySelectedIndex]
destinationVC!.currentUser = currentUser
}
else if segue.identifier == "AddItem" {
print("Adding new event.")
}
}
@IBAction func unwindToMealList(sender: UIStoryboardSegue) {
if let sourceViewController = sender.sourceViewController as? EventViewController, event = sourceViewController.event {
if let selectedIndexPath = tableView.indexPathForSelectedRow {
// Update an existing event.
events[selectedIndexPath.row] = event
tableView.reloadRowsAtIndexPaths([selectedIndexPath], withRowAnimation: .None)
} else {
// Add a new event.
let newIndexPath = NSIndexPath(forRow: events.count, inSection: 0)
events.append(event)
tableView.insertRowsAtIndexPaths([newIndexPath], withRowAnimation: .Bottom)
}
// Save the events.
saveEvents()
}
}
// MARK: NSCoding
func saveEvents() {
let isSuccessfulSave = NSKeyedArchiver.archiveRootObject(events, toFile: Event.ArchiveURL.path!)
if !isSuccessfulSave {
print("Failed to save events...")
}
}
func loadEvents() -> [Event]? {
return NSKeyedUnarchiver.unarchiveObjectWithFile(Event.ArchiveURL.path!) as? [Event]
}
}
目的地視圖控制器（userEventViewController）：
// EventViewController.swift
import UIKit
class UserEventViewController: UIViewController {
// MARK: Properties
@IBOutlet weak var eventDescriptionLabel: UITextView!
@IBOutlet weak var priceLabel: UILabel!
@IBOutlet weak var nameLabel: UILabel!
@IBOutlet weak var photoImageView: UIImageView!
@IBOutlet weak var albumNameLabel: UILabel!
@IBOutlet weak var myTitle: UINavigationItem!
@IBOutlet weak var ratingControl: RatingControl!
var event: Event?
var currentUser: String = ""
override func viewDidLoad() {
super.viewDidLoad()
// Set up views if editing an existing event.
// |
// Crashes on this line \./
myTitle.title = event!.name
nameLabel.text = event!.name
photoImageView.image = event!.photo
ratingControl.rating = event!.rating
eventDescriptionLabel.text = event!.eventDescription
albumNameLabel.text = event!.album
priceLabel.text = String(event!.price)
print(currentUser)
}
@IBAction func buyTickets(sender: AnyObject) {
performSegueWithIdentifier("BuyTickets", sender: self)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "BuyTickets" {
let destinationVC = segue.destinationViewController as? seatsPickerViewController
destinationVC!.price = event!.price
destinationVC!.name = event!.name
destinationVC!.album = event!.album
destinationVC!.photo = event!.photo
destinationVC!.currentUser = currentUser
}
}
}
它會崩潰？ userEventViewController @ luk2302 – luk2302
線47好，無論您在您的源代碼行數（不推薦），或者你告訴我們** **行，而不是行號，我怎麼算在8個空白行行？ – qwertyAV
的 – luk2302