let query = LCQuery(className: "_User")
query.whereKey("location", .locatedNear(LCGeoPoint(latitude: coordinate.latitude, longitude: coordinate.longitude),
minimal: LCGeoPoint.Distance(value: 0, unit: .kilometer),
maximal: LCGeoPoint.Distance(value: 0.1, unit: .kilometer)))
数据库数据变更后,客户端并没有执行回调。