如何從PARSE.com中的PFquery從NSArray獲取objectId

Question

我的PFQuery返回以下描述。我試圖獲取類YouQuestions的objectId。例如：在下面的描述中， Ovx3B1TnaC是Ovx3B1TnaC的第一個索引的objectId。 但是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>";
},

這是我的做法，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]; } }]; for (int i =0; i<quesArray.count; i++) { PFObject *obj = [quesArray[i] objectForKey:@"objectId"]; [searchobjectIDsArray addObject:obj.objectId]; } }];

編輯：

我這樣固定

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

Answer 1

獲取ID數組：

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