迅速/解析getObjectInBackgroundWithId查詢無法正常工作

Question

我正在嘗試使用PFObject的getObjectInBackgroundWithId方法，並且拋出此錯誤：

"Cannot invoke 'getObjectInBackgroundWithId' with an argument list of type (string, block: (PFObject!,NSError?) -> Void"

我寫了下面的代碼：

var result = PFQuery(className: "posts")
    result.getObjectInBackgroundWithId("kk", block: {
        (object: PFObject, error: NSError?) -> Void in
        object["pLikes"] = object["pLikes"] + 1

        object.save()
    })

有什么幫助嗎？

Answer 1

您必須將getObjectInBackgroundWithId與

let query = PFQuery(className: "posts")
query.getObjectInBackgroundWithId("kk") { (objects, error) -> Void in

}

要么

let query = PFQuery(className: "posts")
query.getObjectInBackgroundWithId("kk") { (objects:PFObject?, error:NSError?) -> Void in

}

改變對象

let query = PFQuery(className: "posts")
query.getObjectInBackgroundWithId("kk") { (objects, error) -> Void in
    let testObj = objects?.first as! PFObject
    testObj.setObject(26, forKey: "pLikes")
    testObj.saveInBackgroundWithBlock { (succeeded, error) -> Void in
        if succeeded {
            println("Object Uploaded")
        } else {
            println("Error: \(error) \(error!.userInfo!)")
        }
    }
}