这是我从 icloud 检索数据的代码。我如何将它检索的数据数量限制为 25？我之前看到这个问题得到了回答，但我不确定如何将它应用到我的代码中？你能帮忙吗？
这是我之前看到的回答问题的地方。请确切地告诉我如何将它添加到我的代码中，或者只是在代码中给出答案。
CKQuery from private zone returns only first 100 CKRecords from in CloudKit
import UIKit
import CloudKit
class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
@IBOutlet weak var collectionView: UICollectionView!
var EventsArray:[String] = [String]()
var container:CKContainer?
var privateDatabase:CKDatabase?
var publicDatabase:CKDatabase?
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.container = CKContainer.defaultContainer()
self.privateDatabase = self.container?.privateCloudDatabase
self.publicDatabase = self.container?.publicCloudDatabase
self.collectionView.dataSource = self
self.collectionView.delegate = self
self.LoadEvents()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func LoadEvents() {
let predicate:NSPredicate = NSPredicate(value: true)
let query:CKQuery = CKQuery(recordType: "Data", predicate: predicate)
query.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
if let database = self.publicDatabase {
database.performQuery(query, inZoneWithID: nil, completionHandler: { (records:[AnyObject]!, error:NSError!) in
if error != nil {
self.alert("Error: \(error.localizedDescription)", Message: "Make sure iCloud is turned on and you are connected to the internet")
self.loading.hidden = true
}
else {
dispatch_async(dispatch_get_main_queue()) {
self.EventsArray.removeAll(keepCapacity: false)
for record in records {
let usernameRecord:CKRecord = record as CKRecord
if let event = usernameRecord.objectForKey("Events") as? String{
self.EventsArray.insert(event, atIndex: 0)
}
}
//update data
self.collectionView.reloadData()
self.loading.hidden = true
}
}
})
}}
最佳答案
您应该使用 CKQueryOperation 而不是 performQuery。 然后你可以像这样设置结果限制:
operation.resultsLimit = 25
在这个问题中，您可以看到如何使用 CKQueryOperation:CKQuery from private zone returns only first 100 CKRecords from in CloudKit
关于ios - 我如何限制cloudkit中给出的结果数量，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/29606966/