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我正嘗試使用iCloudKit在IOS/Swift中創建一個簡單的聊天。我在此示例之後建模：Create an App like Twitter: Push Notifications with CloudKit，但將其更改爲聊天而不是Sweets。來自CloudKit的推送通知無法正確同步
該代碼的橫幅和徽章在某種程度上可以很好地工作，並且將數據推送到CloudDashboard的過程非常快速。
但是從雲端套件到設備的同步大部分時間不起作用。有時候，一個設備比其他設備看到的要多，有時更少，只是不太可靠。我正在使用CloudKit中的開發環境。
什麼問題？這是我在的appDelegate和的viewController實現的方法代碼：
func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
// Override point for customization after application launch.
let notificationSettings = UIUserNotificationSettings(forTypes: [.Alert, .Badge, .Sound], categories: nil)
UIApplication.sharedApplication().registerUserNotificationSettings(notificationSettings)
UIApplication.sharedApplication().registerForRemoteNotifications()
return true
}
func application(application: UIApplication, didReceiveRemoteNotification userInfo: [NSObject : AnyObject]) {
let cloudKitNotification = CKNotification(fromRemoteNotificationDictionary: userInfo as! [String:NSObject])
if cloudKitNotification.notificationType == CKNotificationType.Query {
dispatch_async(dispatch_get_main_queue(), {() -> Void in
NSNotificationCenter.defaultCenter().postNotificationName("performReload", object: nil)
})
}
}
func resetBadge() {
let badgeReset = CKModifyBadgeOperation(badgeValue: 0)
badgeReset.modifyBadgeCompletionBlock = { (error) -> Void in
if error == nil {
UIApplication.sharedApplication().applicationIconBadgeNumber = 0
}
}
CKContainer.defaultContainer().addOperation(badgeReset)
}
func applicationWillResignActive(application: UIApplication) {
}
func applicationDidEnterBackground(application: UIApplication) {
resetBadge()
}
func applicationWillEnterForeground(application: UIApplication) {
dispatch_async(dispatch_get_main_queue(), {() -> Void in
NSNotificationCenter.defaultCenter().postNotificationName("performReload", object: nil)
})
}
func applicationDidBecomeActive(application: UIApplication) {
resetBadge()
}
，這是的viewController
import UIKit
import CloudKit
class ChatViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate {
@IBOutlet weak var dockViewHeightConstraint: NSLayoutConstraint!
@IBOutlet weak var messageTextField: UITextField!
@IBOutlet weak var sendButton: UIButton!
@IBOutlet weak var messageTableView: UITableView!
var chatMessagesArray = [CKRecord]()
var messagesArray: [String] = [String]()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
self.messageTableView.delegate = self
self.messageTableView.dataSource = self
// set self as the delegate for the textfield
self.messageTextField.delegate = self
// add a tap gesture recognizer to the tableview
let tapGesture:UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(ChatViewController.tableViewTapped))
self.messageTableView.addGestureRecognizer(tapGesture)
setupCloudKitSubscription()
dispatch_async(dispatch_get_main_queue(), {() -> Void in
NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(ChatViewController.retrieveMessages), name: "performReload", object: nil)
})
// retrieve messages form iCloud
self.retrieveMessages()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func sendButtonTapped(sender: UIButton) {
// Call the end editing method for the text field
self.messageTextField.endEditing(true)
// Disable the send button and textfield
self.messageTextField.enabled = false
self.sendButton.enabled = false
// create a cloud object
//var newMessageObject
// set the text key to the text of the messageTextField
// save the object
if messageTextField.text != "" {
let newChat = CKRecord(recordType: "Chat")
newChat["content"] = messageTextField.text
newChat["user1"] = "john"
newChat["user2"] = "mark"
let publicData = CKContainer.defaultContainer().publicCloudDatabase
//TODO investigate if we want to do public or private
publicData.saveRecord(newChat, completionHandler: { (record:CKRecord?, error:NSError?) in
if error == nil {
dispatch_async(dispatch_get_main_queue(), {() -> Void in
print("chat saved")
self.retrieveMessages()
})
}
})
}
dispatch_async(dispatch_get_main_queue()) {
// Enable the send button and textfield
self.messageTextField.enabled = true
self.sendButton.enabled = true
self.messageTextField.text = ""
}
}
func retrieveMessages() {
print("inside retrieve messages")
// create a new cloud query
let publicData = CKContainer.defaultContainer().publicCloudDatabase
// TODO: we should use this
let predicate = NSPredicate(format: "user1 in %@ AND user2 in %@", ["john", "mark"], ["john", "mark"])
let query = CKQuery(recordType: "Chat", predicate: predicate)
//let query = CKQuery(recordType: "Chat", predicate: NSPredicate(format: "TRUEPREDICATE", argumentArray: nil))
query.sortDescriptors = [NSSortDescriptor(key:"creationDate", ascending: true)]
publicData.performQuery(query, inZoneWithID: nil) { (results: [CKRecord]?, error:NSError?) in
if let chats = results {
dispatch_async(dispatch_get_main_queue(), {() -> Void in
self.chatMessagesArray = chats
print("count is: \(self.chatMessagesArray.count)")
self.messageTableView.reloadData()
})
}
}
}
func tableViewTapped() {
// Force the textfied to end editing
self.messageTextField.endEditing(true)
}
// MARK: TextField Delegate Methods
func textFieldDidBeginEditing(textField: UITextField) {
// perform an animation to grow the dockview
self.view.layoutIfNeeded()
UIView.animateWithDuration(0.5, animations: {
self.dockViewHeightConstraint.constant = 350
self.view.layoutIfNeeded()
}, completion: nil)
}
func textFieldDidEndEditing(textField: UITextField) {
// perform an animation to grow the dockview
self.view.layoutIfNeeded()
UIView.animateWithDuration(0.5, animations: {
self.dockViewHeightConstraint.constant = 60
self.view.layoutIfNeeded()
}, completion: nil)
}
// MARK: TableView Delegate Methods
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
// Create a table cell
let cell = self.messageTableView.dequeueReusableCellWithIdentifier("MessageCell")! as UITableViewCell
// customize the cell
let chat = self.chatMessagesArray[indexPath.row]
if let chatContent = chat["content"] as? String {
let dateFormat = NSDateFormatter()
dateFormat.dateFormat = "MM/dd/yyyy"
let dateString = dateFormat.stringFromDate(chat.creationDate!)
cell.textLabel?.text = chatContent
//cell.detailTextLabel?.text = dateString
}
//cell.textLabel?.text = self.messagesArray[indexPath.row]
// return the cell
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
//print(tableView.frame.size)
//print("count: \(self.chatMessagesArray.count)")
return self.chatMessagesArray.count
}
/*
// 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.
}
*/
// MARK: Push Notifications
func setupCloudKitSubscription() {
let userDefaults = NSUserDefaults.standardUserDefaults()
print("the value of the bool is: ")
print(userDefaults.boolForKey("subscribed"))
print("print is above")
if userDefaults.boolForKey("subscribed") == false { // TODO: maybe here we do multiple types of subscriptions
let predicate = NSPredicate(format: "user1 in %@ AND user2 in %@", ["john", "mark"], ["john", "mark"])
//let predicate = NSPredicate(format: "TRUEPREDICATE", argumentArray: nil)
let subscription = CKSubscription(recordType: "Chat", predicate: predicate, options: CKSubscriptionOptions.FiresOnRecordCreation)
let notificationInfo = CKNotificationInfo()
notificationInfo.alertLocalizationKey = "New Chat"
notificationInfo.shouldBadge = true
subscription.notificationInfo = notificationInfo
let publicData = CKContainer.defaultContainer().publicCloudDatabase
publicData.saveSubscription(subscription) { (subscription: CKSubscription?, error: NSError?) in
if error != nil {
print(error?.localizedDescription)
} else {
userDefaults.setBool(true, forKey: "subscribed")
userDefaults.synchronize()
}
}
}
}
}