ios - 使用 "_User"从 Parse "ObjectId"类中检索用户数据

Question

我正在尝试检索用户数据以使用对象 ID 从 _User 类获取用户信息。我用过这个:

var data:NSMutableArray = NSMutableArray()
func loadData() {
    data.removeAllObjects()

    var profileQuery:PFQuery = PFUser.query()!
        profileQuery.getObjectInBackgroundWithId(userId, block: { (objects, error) -> Void in
            if error == nil {
                self.data.addObject(objects!)
            }
        })
    println(userId) // this is the userId as String.
    println(self.data)  ********* // empty array.
}

我在这里得到一个空数组data..我也试过了，但同样的事情也发生在这里。 :

 var profileQuery:PFQuery = PFUser.query()!
        profileQuery.whereKey("objectId", equalTo: userId)
        profileQuery.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
            if let objects = objects {
                for object in objects {
                    self.data.addObject(object)   
                }   
            }
        }

Answer 1

请记住，“findObjectsInBackgroundWithBlock”是异步发生的!您需要将与数据相关的任何逻辑放入 block 内。

var profileQuery:PFQuery = PFUser.query()!
profileQuery.getObjectInBackgroundWithId(userId, block: { (objects, error) -> Void in
    if error == nil {
        self.data.addObject(objects!)
        println(self.data) //shouldn't be empty.
    }
})