QueryOp with recordID

Question

我有一個recordID.recordName（在這個例子中是singleID），我想查詢queryOp;經過一番搜索和實驗之後，我設法將這些代碼放在一起......這很有效，但它確實是正確的，也許有一條較短的路徑。

CKRecordID *wellKnownIDx = [[CKRecordID alloc] initWithRecordName:singleID]; 
CKReference *singleREX = [[CKReference alloc] initWithRecordID:wellKnownIDx action:CKReferenceActionDeleteSelf]; 

CKDatabase *publicDatabase = [[CKContainer containerWithIdentifier:@"iCloud.blah"] publicCloudDatabase]; 
NSPredicate *predicatex = [NSPredicate predicateWithFormat:@"recordID == %@",singleREX]; 

CKQuery *query = [[CKQuery alloc] initWithRecordType:@"Courses" predicate:predicatex]; 
CKQueryOperation *queryOp =[[CKQueryOperation alloc] initWithQuery:query]; 
queryOp.desiredKeys = @[@"record.recordID.recordName"]; 
queryOp.resultsLimit = 1; 

queryOp.recordFetchedBlock = ^(CKRecord *results) 
{ 
    NSLog(@"Student Found %@",results.recordID.recordName); 
}; 

queryOp.queryCompletionBlock = ^(CKQueryCursor *cursor, NSError *error) 
{ 
    NSLog(@"CKQueryCursor error %@", error); 
}; 

[publicDatabase addOperation:queryOp]; 

Answer 1

你應該有什麼工作，但它看起來像所有你想要做的就是獲取具有已知recordID的記錄。沒有必要爲此使用查詢。它比必要的代碼更多，並且還需要該字段的查詢索引。

相反，使用fetchRecordWithID方法上CKDatabase： https://developer.apple.com/library/ios/documentation/CloudKit/Reference/CKDatabase_class/index.html#//apple_ref/occ/instm/CKDatabase/fetchRecordWithID:completionHandler：