我现在有 CloudKit 在我的应用程序中设置，以便我使用以下代码的帮助添加新记录，
CKRecordID *recordID = [[CKRecordID alloc] initWithRecordName:@"stringArray"];
CKRecord *record = [[CKRecord alloc] initWithRecordType:@"Strings" recordID:recordID];
[record setObject:[NSArray arrayWithObjects:@"one", @"two", @"three", @"four", nil] forKey:@"stringArray"];
[_privateDatabase saveRecord:record completionHandler:nil];
但是，现在我希望能够获取具有相同记录类型的所有记录“Strings”，并将这些记录返回到NSArray中。我该怎么做呢？目前，我所知道的是如何使用recordID单独获取每条记录，这是一个麻烦，必须有一个更简单的方法。
[_privateDatabase fetchRecordWithID:recordID completionHandler:^(CKRecord *record, NSError *error) {
if (error) {
// Error handling for failed fetch from private database
}
else {
NSLog(@"ICLOUD TEST: %@", [record objectForKey:@"stringArray"]);
}
}];
Aaaand，我知道了。使用下面的代码，我能够创建一个在数据库上运行的查询，然后在完成块中返回一个NSArray，我循环访问，并在NSLog中返回已保存密钥的值。
NSPredicate *predicate = [NSPredicate predicateWithValue:YES];
CKQuery *query = [[CKQuery alloc] initWithRecordType:@"Strings" predicate:predicate];
[_privateDatabase performQuery:query inZoneWithID:nil completionHandler:^(NSArray *results, NSError *error) {
for (CKRecord *record in results) {
NSLog(@"Contents: %@", [record objectForKey:@"stringArray"]);
}
}];
这是Swift 3.0中的答案。
func myQuery() {
let predicate = NSPredicate(value: true)
let query = CKQuery(recordType: "tableName", predicate: predicate)
publicDatabase.perform(query, inZoneWith: nil) { (record, error) in
for record: CKRecord in record! {
//...
// if you want to access a certain 'field'.
let name = record.value(forKeyPath: "Name") as! String
}
}
}
解决方案 斯威夫特4，
显示如何获取“YourTable”类型的所有记录，也打印 System Field 和 Custom Field：
let query = CKQuery(recordType: "YourTable", predicate: NSPredicate(value: true))
CKContainer.default().publicCloudDatabase.perform(query, inZoneWith: nil) { (records, error) in
records?.forEach({ (record) in
// System Field from property
let recordName_fromProperty = record.recordID.recordName
print("System Field, recordName: \(recordName_fromProperty)")
// Custom Field from key path (eg: deeplink)
let deeplink = record.value(forKey: "deeplink")
print("Custom Field, deeplink: \(deeplink ?? "")")
})
}
followig函数将返回所请求记录类型的所有记录：
let database = CKContainer(identifier: "container_here").privateCloudDatabase
typealias RecordsErrorHandler = ([CKRecord], Swift.Error?) -> Void
func fetchRecords(forType type: String, completion: RecordsErrorHandler? = nil) {
var records = [CKRecord]()
let query = CKQuery(recordType: type, predicate: NSPredicate(value: true))
let queryOperation = CKQueryOperation(query: query)
queryOperation.zoneID = CloudAssistant.shared.zone.zoneID
queryOperation.recordFetchedBlock = { record in
records.append(record)
}
queryOperation.queryCompletionBlock = { cursor, error in
self.fetchRecords(with: cursor, error: error, records: records) { records in
completion?(records, nil)
}
}
database.add(queryOperation)
}
private func fetchRecords(with cursor: CKQueryCursor?, error: Swift.Error?, records: [CKRecord], completion: RecordsHandler?) {
var currentRecords = records
if let cursor = cursor, error == nil {
let queryOperation = CKQueryOperation(cursor: cursor)
queryOperation.recordFetchedBlock = { record in
currentRecords.append(record)
}
queryOperation.queryCompletionBlock = { cursor, error in
self.fetchRecords(with: cursor, error: error, records: currentRecords, completion: completion)
}
database.add(queryOperation)
} else {
completion?(records)
}
}