Question

    var cardObject = PFObject(className: "YourCard")
    cardObject["cardNumber"] = cardNumber
    cardObject["balance"] = balance
    cardObject["expire"] = date
    cardObject["validFlg"] = cardStatus
    cardObject.saveInBackgroundWithBlock {
        (success: Bool!, error: NSError!) -> Void in
        if (success != nil) {
            NSLog("Object created with id: \(cardObject.objectId)")
        } else {
            NSLog("%@", error)
        }
    }
    dbId = cardObject.objectId

我无法获得objectId，我怎么能得到它？非常感谢你提前。

Answer 1

正如您的函数名称所说，它是一个名为asynchron的函数。这意味着主线程不会等待函数完成。所以你会得到一个（仍然）空的objectId。

要在saveInBackground完成后获取您的objectID，您必须将获取ID的行放入if子句中。

 var cardObject = PFObject(className: "YourCard")
    cardObject["cardNumber"] = cardNumber
    cardObject["balance"] = balance
    cardObject["expire"] = date
    cardObject["validFlg"] = cardStatus
    cardObject.saveInBackgroundWithBlock {
        (success: Bool!, error: NSError!) -> Void in
        if (success != nil) {
            NSLog("Object created with id: \(cardObject.objectId)")
            //Gets called if save was done properly
            dbId = cardObject.objectId

        } else {
            NSLog("%@", error)
        }
    }

另一种选择是在主线程中调用save()。这样，函数在调用objectId之前就完成了。 Parse并不推荐这样做，但它有可能：

cardObject.save()
dbId = cardObject.objectId

如何在使用Parse和swift保存数据后立即获取objectId

1 个答案: