ios - AVgepoint.geopointForCurrentLocationInBackground( )括号里的参数怎么写？

Question

var point = AVGeoPoint.geoPointForCurrentLocationInBackground( ((AVGeoPoint!,NSError!) -> Void)!)
query.limit = 30
query,wherKey("location",nearGeopoint:point,withinKilometers:20)

其中括号中的 ((AVGeoPoint!,NSError!) -> Void)! 是出现的提示代码，求问括号里的参数具体应该怎么写？

Answer 1

(AVGeoPoint!, NSError!) -> Void) This requires you to pass a function in, you can directly use an anonymous function (closure)
{ (point, error) -> Void in

    //数据处理

}

Answer 2

Is this method system-wide? AVGeoPoint.geoPointForCurrentLocationInBackground

The parameter written like this is a function pointer