【发布时间】：2015-04-02 19:21:54
【问题描述】：
我的社交网络应用程序取得了不错的进展。我遇到了一个问题。我有一个 ViewController，它提供了一个 TableView，它填充了我的解析数据库中的内容。在单元格中，我有一个 RSVP 按钮，该按钮应该在单击时根据 indexPath 向数据库发送 RSVP，并在再次单击时将其删除。我相信我的逻辑是正确的，但是，我不断收到错误：
上一次操作后操作无效。
我放置了一个断点来定位崩溃的原因，并且我发现它发生在 rsvpButtonClicked IBOutlet 函数中的 addUniqueObject 行。
有人可以帮助我吗？我的代码如下。
import UIKit
import CoreLocation
class MainFeedViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet var eventsTable: UITableView!
var user = PFUser.currentUser()
var refresher: UIRefreshControl!
var eventId = [String]()
var eventNames = [String]()
var eventCity = [String]()
var imageFiles = [PFFile]()
var getEventsQuery = 0
var userRsvps = [NSArray]()
var rsvp = 0
override func viewDidLoad() {
super.viewDidLoad()
getuserlocation()
getTodayDate()
}
override func viewWillAppear(animated: Bool) {
refreshControl()
//getMyRsvps()
}
override func viewDidAppear(animated: Bool) {
let timer = NSTimer.scheduledTimerWithTimeInterval(2.0, target: self, selector: "eventQuery", userInfo: nil, repeats: false)
}
func getMyRsvps() {
var getRsvps = PFUser.query()
getRsvps.whereKey("objectId", equalTo: user.objectId)
getRsvps.whereKeyExists("myrsvp")
getRsvps.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]!, error: NSError!) -> Void in
if error == nil {
self.userRsvps.append(objects)
}
}
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = self.eventsTable.dequeueReusableCellWithIdentifier("mainFeedContent") as MainFeedContentTableViewCell
cell.eventName.text = eventNames[indexPath.row]
imageFiles[indexPath.row].getDataInBackgroundWithBlock{
(imageData: NSData!, error: NSError!) -> Void in
if error == nil {
let image = UIImage(data: imageData)
cell.eventImage.image = image
}
}
cell.rsvpButton.tag = indexPath.row
cell.rsvpButton.addTarget(self, action: "rsvpButtonClick:", forControlEvents: UIControlEvents.TouchUpInside)
return cell
}
@IBAction func rsvpButtonClick(sender: UIButton) {
var senderButton = sender
println("Current row \(senderButton.tag)")
var tempObject = eventId[senderButton.tag]
println("\(tempObject)")
PFUser.currentUser().addUniqueObject(tempObject, forKey: "myrsvp")
PFUser.currentUser().saveInBackground()
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return eventId.count
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let mainViewIdentifier = "showDetail"
if segue.identifier == mainViewIdentifier {
if let destination = segue.destinationViewController as? DetailViewController {
if let feedIndex = eventsTable.indexPathForSelectedRow()?.row {
destination.eventNames = eventNames[feedIndex]
destination.eventId = eventId[feedIndex]
destination.eventImagesFile = imageFiles[feedIndex]
}
}
}
}
func eventQuery() {
let getEventsQuery = PFQuery(className: "Events")
getEventsQuery.whereKey("eventLocation", nearGeoPoint: user["location"] as PFGeoPoint, withinMiles: user["preferredDistanceEvents"] as Double)
getEventsQuery.limit = 16
getEventsQuery.findObjectsInBackgroundWithBlock {(objects: [AnyObject]!, error: NSError!) -> Void in
if error == nil {
println("Successfully retrieved \(objects.count) events")
for object in objects {
self.eventId.append(object.objectId)
self.eventNames.append(object["eventName"] as String)
self.eventCity.append(object["eventCity"] as String)
self.imageFiles.append(object["eventPicture"] as PFFile)
self.eventsTable.reloadData()
}
} else {
println(error)
}
}
}
func refreshControl() {
refresher = UIRefreshControl()
refresher.attributedTitle = NSAttributedString(string: "Pull to refresh")
refresher.addTarget(self, action: "refresh", forControlEvents: UIControlEvents.ValueChanged)
self.eventsTable.addSubview(refresher)
}
/*
func scrollViewDidEndDragging(scrollView: UIScrollView, willDecelerate decelerate: Bool) {
var height: CGFloat = scrollView.frame.size.height
var contentYoffset: CGFloat = scrollView.contentOffset.y
var distanceFromBottom: CGFloat = scrollView.contentSize.height - contentYoffset
if distanceFromBottom <= height {
println("End of Table")
refresh()
}
}
*/
func refresh() {
self.getEventsQuery++
if self.getEventsQuery < self.eventId.count {
let refreshEventsQuery = PFQuery(className: "Events")
refreshEventsQuery.whereKey("location", nearGeoPoint: user["location"] as PFGeoPoint, withinMiles: user["preferredDistanceEvents"] as Double)
refreshEventsQuery.whereKey("objectId", notContainedIn: eventId)
refreshEventsQuery.limit = 4
refreshEventsQuery.findObjectsInBackgroundWithBlock {(objects: [AnyObject]!, error: NSError!) -> Void in
if error == nil {
println("Successfully retrieved \(objects.count) events")
for object in objects {
self.eventNames.append(object["eventName"] as String)
self.eventCity.append(object["City"] as String)
self.imageFiles.append(object["eventPicture"] as PFFile)
self.eventId.append(object.objectId)
self.eventsTable.reloadData()
}
} else {
println(error)
}
}
} else {
println("No More Events. Sorry")
}
self.refresher.endRefreshing()
}
func getuserlocation() {
PFGeoPoint.geoPointForCurrentLocationInBackground { (geopoint: PFGeoPoint!, error: NSError!) -> Void in
if error == nil {
self.user["location"] = geopoint
self.user.saveInBackground()
}
}
}
func getTodayDate(){
var today = NSDate()
var calendar = NSCalendar.currentCalendar()
var flags = NSCalendarUnit.HourCalendarUnit | NSCalendarUnit.MinuteCalendarUnit
var components = calendar.components(flags, fromDate: today)
var hour = components.hour
var minutes = components.minute
println("Today is \(today). The time is \(hour):\(minutes)")
}
}
【问题讨论】：
-
myrsvp是什么服务器上的型号？指针？数组？关系？ -
这是我解析数据库中的数组类型。
-
myrsvp 本质上是一个数组，包含用户 rsvp'd 到的事件的所有事件 ID。
-
你有没有在
currentUser上给fetch:打电话？ -
不，我不会在 currentUser 上调用 fetch。我有用户登录并创建一个新的 currentUser 会话。
标签： ios swift parse-platform