Swift语言：更新分析对象

我创建了一个查询，获取用户名和设备位置7miles内我周围的人的位置，我想更新这些对象每5-10秒（我还没有决定）。最佳做法是什么？我应该创建一个NSTimer()并以这种方式调用它吗？请帮忙！！

var timer = NSTimer() 

    override func viewDidLoad() { 
    super.viewDidLoad() 

    timer == NSTimer.scheduledTimerWithTimeInterval(5, target: self,   selector: "queryFunc", userInfo: nil, repeats: true) 
    } 

    func queryFunc() { 

    var query = PFQuery(className:"GameScore") 

    query.whereKey("playerName", equalTo:"Sean Plott") 

    query.findObjectsInBackgroundWithBlock { 

     (objects: [AnyObject]!, error: NSError!) -> Void in 

     if error == nil { 

     // The find succeeded. 

     NSLog("Successfully retrieved \(objects.count) scores.") 

     // Do something with the found objects 

     for object in objects { NSLog("%@", object.objectId) 

     } 

    } else { 

     // Log details of the failure 

     NSLog("Error: %@ %@", error, error.userInfo!) 

    } 

    } 

    /* 

    This is just an example query, the point of this is the timer and how to update objects periodically 

    */ 

    }

来源

2015-05-07 Eric Prieto