使用Swift在CloudKit中获取记录资产

时间:2015-01-29 04:20:26

标签: ios swift cloudkit

我是CloudKit的新手,我无法将数据库中的资源连接到我的应用中的ImageView和TextView。在我的CloudKit数据库中,在记录类型下,我创建了一个名为" Companies"的记录。然后我转到Public Data-> Default Zone,然后创建了一个名为" myCompany"的记录的新实例。在" myCompany"我有两个资产,一个图像和一个.txt文件。我想将这些资产连接到我的应用程序。我不确定我是否需要使用CKQuery或什么是最好的方法。任何建议将不胜感激。以下是我到目前为止的情况。如果有更好的方式,请随时提供反馈,我很乐意知道。谢谢。

import UIKit
import CloudKit

class LearnViewController: UIViewController {

@IBOutlet weak var theImage: UIImageView!
@IBOutlet weak var theText: UITextView!


let myRecord = CKRecord(recordType: "Companies" )

var image: UIImage!

let database =  CKContainer.defaultContainer().publicCloudDatabase


func loadCoverPhoto(completion:(photo: UIImage!) -> ()) {
    dispatch_async(
        dispatch_get_global_queue(
            DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)){
                var image: UIImage!
                let coverPhoto = self.myRecord.objectForKey("Picture") as CKAsset!
                if let asset = coverPhoto {

                    if let url = asset.fileURL {
                        let imageData = NSData(contentsOfFile: url.path!)!

                        image = UIImage(data: imageData) 
                    }
                }

                completion(photo: image)
    }
}


 override func viewDidLoad() {
    super.viewDidLoad()

    loadCoverPhoto() { photo in
        dispatch_async(dispatch_get_main_queue()) {
            self.theImage.image = photo
        }
    }

1 个答案:

答案 0 :(得分:3)

如果您通过执行类似以下的获取来了解recordId,则可以直接获取记录:

database.fetchRecordWithID(CKRecordID(recordName: recordId), completionHandler: {record, error in

或者,如果您不知道ID,则应使用以下代码查询记录。只需创建正确的NSPredicate。查询可以返回多于1条记录。

var query = CKQuery(recordType: recordType, predicate: NSPredicate(value: true))
var operation = CKQueryOperation(query: query)
operation.recordFetchedBlock = { record in
    // is this your record...
}
operation.queryCompletionBlock = { cursor, error in
    self.handleCallback(error, errorHandler: {errorHandler(error: error)}, completionHandler: {
        // ready fetching records
        })
}
operation.resultsLimit = CKQueryOperationMaximumResults;
database.addOperation(operation)

在使用fetchRecordWithID选项的情况下,代码如下所示:

override func viewDidLoad() {
    super.viewDidLoad()

    database.fetchRecordWithID(CKRecordID(recordName: recordId), completionHandler: {record, error in
        self.myRecord = record
        loadCoverPhoto() { photo in
            dispatch_async(dispatch_get_main_queue()) {
                self.theImage.image = photo
            }
        }
    }
}