How do I query and obtain data from CloudKit? - ios

Question

I am fairly new to Swift, and just started learning about CloudKit this week for an iOS app project.
The database is working, I can add records and find records in the database.
I have run into a problem sending a query to CloudKit and accessing the data related to the query.
The CloudKit data has unique identifiers, so the search is for one of those identifiers (so a query should only return one record). I am then trying to obtain three pieces of information from that record - "UPC", "foodName", and "Ingredients" (all strings)
Here is the code section that executes the query and tries to obtain the data.
let publicDatabase = CKContainer.defaultContainer().publicCloudDatabase
let predicate = NSPredicate(format: "UPC = %#", subStr)
let query = CKQuery(recordType: "Food", predicate: predicate)
publicDatabase.performQuery(query, inZoneWithID: nil,
completionHandler: ({results, error in
if (error != nil) {
dispatch_async(dispatch_get_main_queue()) {
print("CloudKit Error")
}
} else {
if results!.count > 0 {
var record = results as! CKRecord
dispatch_async(dispatch_get_main_queue()) {
print("UPC Found")
let cloudUPC = record.objectForKey("UPC") as! CKAsset
print("UPC from CloudKit \(cloudUPC)")
}
} else {
dispatch_async(dispatch_get_main_queue()) {
print("UPC Not Found")
}
}
}
}))
The crash occurs at this point
var record = results as! CKRecord
and returns "EXC_Breakpoint(code = 1, subcode - 0x10047b7c)
Any suggestions on how to solve this problem?
Thanks

Answer 1

Thank you for the suggestion rmaddy.
This is how I fixed the code
let publicDatabase = CKContainer.defaultContainer().publicCloudDatabase
let predicate = NSPredicate(format: "UPC = %#", subStr)
let query = CKQuery(recordType: "Food", predicate: predicate)
publicDatabase.performQuery(query, inZoneWithID: nil,
completionHandler: ({results, error in
if (error != nil) {
dispatch_async(dispatch_get_main_queue()) {
print("Cloud Error")
}
} else {
if results!.count > 0 {
dispatch_async(dispatch_get_main_queue()) {
for entry in results! {
let cloudUPC = entry["UPC"] as? String
print("UPC from CloudKit \(cloudUPC)")
let cloudFoodName = entry["foodName"] as? String
print("Name from CloudKit \(cloudFoodName)")
let cloudIngredients = entry["Ingredients"] as? String
print("Ingredients from CloudKit \(cloudIngredients)")
}
} else {
dispatch_async(dispatch_get_main_queue()) {
print("UPC Not Found")
}
}
}
}))

Answer 2

you need to first to write for loop on items in record then print each UPC
like that :
for item in record {
print(item["UPC"]
print(item["foodName"]
}