Kodeco Forums

Video Tutorial: Introduction to CloudKit Part 5: Fetching Data

🎓 Courses & Articles
1

Learn how to create queries and pass them in to CloudKit's convenience API to get the records you need.

This is a companion discussion topic for the original entry at https://www.raywenderlich.com/3413-introduction-to-cloudkit/lessons/5
2

I’m on Xcode 7.2.1 (7C1002) and Deployment target: 9.2. I’m on CloudKit Part 5, Fetching Data. I’ve have the following error and would appreciate your assistance.

Initializer for Conditional Binding 2016-03-06 at 4.45.25 PM.png4192Ă—1698 508 KB

3

This is an older tutorial made using Swift 1.0, so there’s going to be errors using Swift 2. It’s been a long time since I’ve worked on this project.

That said, it looks like ckAsset.fileURL is no longer an optional, so you don’t have to wrap it in a if-let block.

Here’s the code that should compile:

weak var weakCell = cell
backgroundQueue.addOperationWithBlock() {
  let image = ckRecord.objectForKey("Photo") as! CKAsset!
  if let ckAsset = image {
    let imageData = NSData(contentsOfURL:ckAsset.fileURL)
    let mainQueue = NSOperationQueue.mainQueue()
    mainQueue.addOperationWithBlock() {
      cell.photo.image = UIImage(data: imageData!)
    }
  }
}

If you need anything else, feel free to shoot me a message.

Thanks!

4

Hi Brian,
In your above example from the series there is a weak reference to a cell that is created to presumably stop a retain cycle, but it’s not being used. Should the addOperation() code for the mainQueue use it as below?

weakCell.photo.image = UIImage(data: imageData!)

And if so, can you explain how leaving the strong reference would cause a retain cycle?

Thanks,
Dan

5

I don’t get any records or error returned from my Query. I have:

struct Options
// these for cloud management
static var galleryContainer:CKContainer = CKContainer.default()
static var galleryDatabase:CKDatabase = galleryContainer.publicCloudDatabase
static var galleryData:[CKRecord]?
static var backgroundQueue:OperationQueue = OperationQueue()
}

    let myQuery = CKQuery(recordType:"Gallery", predicate:NSPredicate(value:true))
    
    Options.galleryDatabase.perform(myQuery, inZoneWith:nil) {
        records, error in
        if error != nil {
            print(error?.localizedDescription)
        } else {
            print("no error in query")
            for aGalleryRecord in records! {
                self.galleryData!.append(aGalleryRecord as CKRecord)
                print (" got record: \(aGalleryRecord)")
            }
        }
    }

I specify iCloud.com.jaymanderson.gallery for my container.
I think I populated the container with one record of type “Gallery”.
What can I try next?
– jay

6

Could you update it to swift 3 there’s a lot of change since

7

It’s on our radar for sure!