クラウドキットを使用してTwitterなどのアプリを作成していますが、アプリをリフレッシュまたは再起動するまで問題なく動作します。エラーはありませんが、フィードは空になり、すべてのデータが失われます。複数のユーザーがアプリを使用しているときに何が起こるかを確認しようとはしていません。 CloudKitデータベースに書き込ま更新または再起動後にフィードがすべて失われる
class SweetsTableViewController: UITableViewController {
var sweets = [CKRecord]()
var refresh: UIRefreshControl!
override func viewDidLoad() {
super.viewDidLoad()
refresh = UIRefreshControl()
refresh.attributedTitle = NSAttributedString(string: "Pull to Refresh")
refresh.addTarget(self, action: "loadData", forControlEvents: .ValueChanged)
self.tableView.addSubview(refresh)
loadData()
}
func loadData()
{
sweets = [CKRecord]()
let publicData = CKContainer.defaultContainer().publicCloudDatabase
let query = CKQuery(recordType: "Beam", predicate: NSPredicate(format: "TRUEPREDICATE", argumentArray:nil))
query.sortDescriptors = [NSSortDescriptor(key:"creationDate", ascending: false)]
publicData.performQuery(query, inZoneWithID: nil) { (results: [CKRecord]?, error: NSError?) -> Void in
if let sweets = results
{
self.sweets = sweets
dispatch_async(dispatch_get_main_queue(), {() -> Void in
self.tableView.reloadData()
self.refresh.endRefreshing()
})
}
}
}
@IBAction func sendSweet(sender: AnyObject)
{
let alert = UIAlertController(title: "New Beam", message: "Type a Beam", preferredStyle: .Alert)
alert.addTextFieldWithConfigurationHandler { (textField: UITextField) in
textField.placeholder = "Your Beam"
}
alert.addAction(UIAlertAction(title: "Send", style: .Default, handler: {(action: UIAlertAction) -> Void in
let textField = alert.textFields!.first!
if textField.text != ""
{
let newBeam = CKRecord(recordType: "Beam")
newBeam["content"] = textField.text
let publicData = CKContainer.defaultContainer().publicCloudDatabase
publicData.saveRecord(newBeam, completionHandler: {(record:CKRecord?, error: NSError?) -> Void in
if error == nil
{
dispatch_async(dispatch_get_main_queue(), {() -> Void in
print("Beam saved")
self.tableView.beginUpdates()
self.sweets.insert(newBeam, atIndex: 0)
let indexPath = NSIndexPath(forRow: 0, inSection: 0)
self.tableView.insertRowsAtIndexPaths([indexPath], withRowAnimation: .Top)
self.tableView.endUpdates()
})
}else{
print(error)
}
})
}
}))
alert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return sweets.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
if sweets.count == 0
{
return cell
}
let sweet = sweets[indexPath.row]
if let sweetContent = sweet["content"] as? String
{
let dateFormat = NSDateFormatter()
dateFormat.dateFormat = "MM/dd/yyyy"
let dateString = dateFormat.stringFromDate(sweet.creationDate!)
cell.textLabel?.text = sweetContent
cell.detailTextLabel?.text = dateString
}
return cell
}