如何在PARSE.com中從PFquery的NSArray獲取objectId

Question

我的PFQuery返回以下描述。我試圖獲取 YouQuestions的objectId。例如：在以下描述中，Ovx3B1TnaC是第一個objectId quesAray的索引。但我不知道如何獲取它。

Printing description of quesArray: 
<__NSArrayM 0xe1198f0>(
<YouQuestions:OVx3BlTnaC:(null)> { 
    askedUser = "<PFUser:XGvZsNyg9p>"; 
    attachedImage = "<PFFile: 0xb4c9d20>"; 
    category = Business; 
    geoLocation = "<PFGeoPoint: 0xb4c9ea0>"; 
    question = "Who is kaka?"; 
    thumbImage = "<PFFile: 0xb4c9dd0>"; 
}, 

這是我如何做，但返回nil

PFQuery *fetchTimeLine = [PFQuery queryWithClassName:@"YouQuestions"]; [fetchTimeLine whereKeyExists:@"objectId"]; [fetchTimeLine findObjectsInBackgroundWithBlock:^(NSArray *quesArray, NSError *error) { for (int i =0; i<quesArray.count; i++) { PFObject *obj = [quesArray[i] objectForKey:@"objectId"]; [searchobjectIDsArray addObject:obj.objectId]; } }];

編輯：

我固定它像這樣

for (PFObject *object in quesArray) { NSLog(@"%@", object.objectId); }

Answer 1

獲取ID數組：

NSArray *oids = [quesArray valueForKeyPath:@"objectId"];