ios - 带有记录 ID 的查询操作

Question

我有一个recordID.recordName（在这个例子中是singleID），我想用queryOp查询；经过一些搜索和实验后，我设法将这段代码放在一起......这可行，但它真的正确吗，也许有更短的路径。

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