百度地图无法添加标注，view forAnnotation为执行怎么办

我看网上有人说是因为delegate的问题，需要在使用annotation之前先mapview.delegate= self，但我在didload中实现了，仍无法对地图进行标注，请问怎么解决呢。
全部代码在这：大概就是我先取到当前位置，然后根据定位的坐标进行周边的poi检索，定位的时候也无法取得中心点，总而言之就是数据全部能得到，但是地图上一点动静没有绝望
import UIKitclass ViewController: UIViewController, BMKMapViewDelegate, BMKPoiSearchDelegate, BMKLocationServiceDelegate {    var mapView:BMKMapView?
    var search : BMKPoiSearch?
    var localsever = BMKLocationService.init()
    var selfLocation : CLLocationCoordinate2D?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        let mapView = BMKMapView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height))
        self.view.addSubview(mapView)
        
        mapView.delegate = self
        mapView.zoomLevel = 13
        mapView.isSelectedAnnotationViewFront = true
        
        
        let btn = UIButton(frame: CGRect(x: 10, y: 10, width: 40, height: 40))
        btn.backgroundColor = UIColor.cyan
        btn.addTarget(self, action: #selector(userLocal(_:)), for: UIControlEvents.touchUpInside)
        self.view.addSubview(btn)
        
        let searchBtn = UIButton(frame: CGRect(x: 70, y: 10, width: 60, height: 40))
        searchBtn.setTitle("search", for: UIControlState())
        searchBtn.backgroundColor = UIColor.cyan
        searchBtn.addTarget(self, action: #selector(searchPoi(_:)), for: UIControlEvents.touchUpInside)
        self.view.addSubview(searchBtn)
        
    }
    
    func searchPoi(_ sender: UIButton){
        search = BMKPoiSearch.init()
        search?.delegate = self
        
        var option = BMKNearbySearchOption.init()
        option.pageIndex = 1
        option.pageCapacity = 10
        option.location = selfLocation!
        option.keyword = "购物"
        option.radius = 3000
        
        var flag = search?.poiSearchNear(by: option)
        if flag!{
            print("检索发起成功")
        }else{
            print("检索发起失败")
        }    }
    
    func onGetPoiResult(_ searcher: BMKPoiSearch!, result poiResult: BMKPoiResult!, errorCode: BMKSearchErrorCode) {
        mapView?.removeAnnotations(mapView?.annotations)
        if errorCode == BMK_SEARCH_NO_ERROR{
            var pointAnnotation = BMKPointAnnotation()
            var Annotation = [BMKPointAnnotation]()
            for i in 0..<poiResult.poiInfoList.count{
                var poi = poiResult.poiInfoList[i] as! BMKPoiInfo
                pointAnnotation.coordinate = poi.pt
                pointAnnotation.title = poi.name
                pointAnnotation.subtitle = poi.address
                Annotation.append(pointAnnotation)
                print("添加地点---\(poi.pt)---\(poi.name)----\(poi.address)")
            }
            self.mapView?.addAnnotations(Annotation)
            self.mapView?.showAnnotations(Annotation, animated: true)
        }
    }
    
    func userLocal(_ sender: UIButton){
        localsever.delegate = self
        mapView?.zoomLevel = 13
        mapView?.showsUserLocation = true
        mapView?.userTrackingMode = BMKUserTrackingModeNone
        localsever.startUserLocationService()
        print("定位开始")
        
    }
    func didUpdate(_ userLocation: BMKUserLocation!) {
        //mapView?.centerCoordinate = userLocation.location.coordinate
        mapView?.setCenter(userLocation.location.coordinate, animated: true)
        selfLocation = userLocation.location.coordinate
        print("定位完成，此时位于\(String(describing: selfLocation))")
        localsever.stopUserLocationService()
    }
    
    
    
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        mapView?.viewWillAppear()
        mapView?.delegate = self
        search?.delegate = self
        localsever.delegate = self
    }
    
    override func viewWillDisappear(_ animated: Bool) {
        super.viewWillDisappear(animated)
        mapView?.viewWillDisappear()
        mapView?.delegate = nil
        search?.delegate = nil
        localsever.delegate = nil    }
    
    func mapView(_ mapView: BMKMapView!, viewFor annotation: BMKAnnotation!) -> BMKAnnotationView! {
        print("start a new annotation view")
        let AnnotationViewID = "renameMark"
        var annotationView = mapView.dequeueReusableAnnotationView(withIdentifier: AnnotationViewID) as! BMKPinAnnotationView?
        if annotationView == nil {
            annotationView = BMKPinAnnotationView(annotation: annotation, reuseIdentifier: AnnotationViewID)
            // 设置颜色
            annotationView!.pinColor = UInt(BMKPinAnnotationColorRed)
            // 从天上掉下的动画
            annotationView!.animatesDrop = true
            // 设置是否可以拖拽
            annotationView!.isDraggable = false
            annotationView?.canShowCallout = true
        }
        annotationView?.annotation = annotation
        print("new annotation is complete")
        return annotationView
    }
}