CloudKit-不会更新 (Swift)

Question

import UIKit
import CloudKit

class IdeaTableViewController: UITableViewController {

var posts = [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()
}

// MARK: - Table view data source

override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
    // #warning Incomplete implementation, return the number of sections
    return 1
}

override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    // #warning Incomplete implementation, return the number of rows
    return posts.count
}

override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)

    if posts.count == 0{
        return cell
        print("zero Posts")
    }
    let post = posts[indexPath.row]

    if let postContent = post["content"] as? String{
        let dateFormat = NSDateFormatter()
        dateFormat.dateFormat = "MM/dd/yyyy"
        let dateString = dateFormat.stringFromDate(post.creationDate!)
        print("trying to Write the Post...")
        cell.textLabel?.text = "\(postContent)"
        cell.detailTextLabel?.text = "\(dateString)"

    }

    return cell
}

func loadData(){
    posts = [CKRecord]()
    let publicData = CKContainer.defaultContainer().publicCloudDatabase
    let query = CKQuery(recordType: "Post", 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 posts = results{
            self.posts = posts
            dispatch_async(dispatch_get_main_queue(), { () -> Void in
                self.tableView.reloadData()
                self.refresh.endRefreshing()
            })
        }
    }

}

@IBAction func add(sender: AnyObject) {
    let alert = UIAlertController(title: "New Idea", message: "Tell us what you're thinking.", preferredStyle: .Alert)
    alert.addTextFieldWithConfigurationHandler { (textField: UITextField) -> Void in
        textField.placeholder = "Idea"
    }
    alert.addAction(UIAlertAction(title: "Post", style: .Default, handler: { (action: UIAlertAction) -> Void in

        let textField = alert.textFields!.first!

        if textField.text != ""{

            let newPost = CKRecord(recordType: "Post")
            newPost["content"] = textField.text
            let publicData = CKContainer.defaultContainer().publicCloudDatabase
            publicData.saveRecord(newPost, completionHandler: {(
                record:CKRecord?, error:NSError?) -> Void in
                if error == nil{
                    print("Post Saved")
                    dispatch_async(dispatch_get_main_queue(), {() -> Void in
                        self.tableView.beginUpdates()
                        self.posts.insert(newPost, atIndex: 0)
                        let indexPath = NSIndexPath(forRow: 0, inSection: 0)
                        self.tableView.insertRowsAtIndexPaths([indexPath], withRowAnimation: .Top)
                        self.tableView.endUpdates()
                    })
                }else{
                    print("Post ERROR")
                    print(ErrorType)
                }
            })

        }

    }))

    alert.addAction(UIAlertAction(title: "Cancel", style: .Cancel, handler: nil))

    self.presentViewController(alert, animated: true, completion: nil)
  }


}

当我的 table 应该在我 post 更新时，它没有做任何事情。我不知道我是否只是写了一个严重的错误或其他什么。 posts 出现在云工具包 iCloud 在线但不在我的 table 中，即使在我刷新它之后也是如此。

Answer 1

虽然您使用的是 CKDatabase.performQuery 便捷方法，但您可能遇到了 CKQueryOperation.recordFetchedBlock 中的警告所描述的相同情况：

Query indexes are updated asynchronously so they are not guaranteed to be current. If you query for records that you recently changed and not allow enough time for those changes to be processed, the query results may be incorrect. The results may not contain the correct records and the records may be out of order.

来源：CKQueryOperation Class Reference

this answer to another question:

中描述了解决方法

If you're using a CKQuery to back a view you'll want to keep a side table of records that have been modified locally and stitch those into the view until the query starts returning that record.

CloudKit-不会更新 (Swift)

CloudKit-Won't update (Swift)

uitableview

ios

swift

cloudkit