如何從Facebook ID創建指向解析PFUser的指針

Question

我正在進行Facebook圖表通話，以結識正在使用我的應用程序的用戶的朋友。 我從圖表調用中獲得了用戶朋友的Facebook ID。 下面是我嘗試從具有該ID的Parse獲取的內容，但是它並沒有讓所有用戶都回來，我相信這是因為它是異步調用。 如何保存正在使用該應用程序的用戶fb朋友的指針數組？ 提前致謝！！

 graphConnection.addRequest(requestFriends, completionHandler: { (connection: FBSDKGraphRequestConnection!, result: AnyObject!, error: NSError!) -> Void in

                     if result.objectForKey("friends") != nil {

                        // parsing dictionary to get results
                        let firstDict = result.objectForKey("friends")
                        let dataArray = firstDict!.objectForKey("data")

                        let myFriendsUsingTheAppCount = dataArray!.count
                        print("\(myFriendsUsingTheAppCount)")

                        let friendsArray:NSMutableArray = []

                        for var i = 0; i < dataArray!.count; i++ {

                           let friend = dataArray![i]

                           let friendFbObjectID = friend.objectForKey("id")!

                           let query = PFUser.query()
                           query!.whereKey("facebookID", equalTo: friendFbObjectID)

                           query!.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in

                              if error == nil {

                                 // this is where I was going to save this specific user as a pointer

                              } else {

                                 // some error
                              }
                           })
                           // this is saving just the friend's name/fb id to an array, but I want an array of pointers to the PFUser
                           friendsArray.addObject(friend)
                        }

                     } else {

                        // fb friends is nil
                        print("FB friends came back nil")
                     }
                  })

Answer 1

使用whereKey:containedIn:可以將其簡化為單個查詢whereKey:containedIn:

let facebookIDs = dataArray.map { $0.objectForKey("id")! }
let query = PFUser.query()!
query.whereKey("facebookID", containedIn: facebookIDs)

現在，查詢將包含其Facebook ID在傳遞給查詢的數組中的所有用戶。

（swift語法可能不正確，沒有仔細檢查）