CloudKit:获取具有特定记录类型的所有记录？

Question

我目前在我的应用程序中设置了CloudKit,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"]);            
  }
}];

Answer 1

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,我将循环访问,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"]);
    }
}];

Answer 2

Swift 4的解决方案显示了如何获取"YourTable"类型的所有记录,还打印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 ?? "")")
  })
}