这里的思路：
（1）把图片放到屏幕的中间，这样在拖动的时候就不会跟随着地图移动了。
（2）百度地图提供了，View坐标和地理坐标转换的方法。正式这个方法的存在，方便我们及时的获取拖动后的，屏幕中间的图片所在位置的经纬度。
当拖动地图的时候，定位的图片一直在屏幕的中央，当拖动停止的时候会显示出具体的信息
#import "HouseTypeMapVC.h" @interface HouseTypeMapVC ()<BMKMapViewDelegate,BMKLocationServiceDelegate,BMKGeoCodeSearchDelegate>{ BMKLocationService * _locService; } @property (nonatomic,strong) UIView * locationView; @property (nonatomic,strong) UIImageView * locImageView; @property (nonatomic,strong) UIView * messageView; @property (nonatomic,strong) UILabel * addressLabel; @property (nonatomic,strong) UIButton * sureButton; @property (nonatomic,strong) NSString * name; @property (nonatomic,assign) CLLocationCoordinate2D location2D; @property (nonatomic, strong)BMKGeoCodeSearch* searchAddress; @property (strong, nonatomic) IBOutlet BMKMapView *mapView; @property (nonatomic,strong)BMKUserLocation *userLocation; //定位功能 @end @implementation HouseTypeMapVC -(void)viewWillAppear:(BOOL)animated{ [super viewWillAppear: animated]; [_mapView viewWillAppear]; _mapView.delegate = self; // 此处记得不用的时候需要置nil，否则影响内存的释放 _locService.delegate = self; } -(void)viewWillDisappear:(BOOL)animated{ [_mapView viewWillDisappear]; _mapView.delegate = nil; // 不用时，置nil _locService.delegate = nil; } - (void)viewDidLoad { [super viewDidLoad]; } - (void)initUI{ [self goBackBtn]; _mapView.mapType=BMKMapTypeStandard; [self initlocationService]; } #pragma mark --initlocationService--定位 -(void)initlocationService{ _locService = [[BMKLocationService alloc]init]; [_locService startUserLocationService]; _mapView.showsUserLocation = NO;//先关闭显示的定位图层 _mapView.userTrackingMode = BMKUserTrackingModeNone;//设置定位的状态 _mapView.showsUserLocation = YES;//显示定位图层 _mapView.showMapScaleBar = YES;//显示比例尺 _mapView.zoomLevel = 17;//地图显示的级别 _searchAddress = [[BMKGeoCodeSearch alloc]init]; _searchAddress.delegate = self; } //这里是创建中心显示的图片和显示详细地址的View - (void)createLocationSignImage{ //LocationView定位在当前位置，换算为屏幕的坐标，创建的定位的图标 self.locationView = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 28, 35)]; self.locImageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 28, 35)]; self.locImageView.image = [UIImage imageNamed:@"myLocation"]; [self.locationView addSubview:self.locImageView]; //messageView 展示定位信息的View和Label和button self.messageView = [[UIView alloc]init]; self.messageView.backgroundColor = [UIColor whiteColor]; //把当前定位的经纬度换算为了View上的坐标 CGPoint point = [self.mapView convertCoordinate:_mapView.centerCoordinate toPointToView:_mapView]; //当解析出现错误的时候，会出现超出屏幕的情况，一种是大于了屏幕，一种是小于了屏幕 if(point.x > ScreenWidth || point.x < ScreenWidth/5){ point.x = _mapView.centerX; point.y = _mapView.centerY-64; } NSLog(@"Point------%f-----%f",point.x,point.y); //重新定位了LocationView self.locationView.center = point; [self.locationView setFrame:CGRectMake(point.x-14, point.y-18, 28, 35)]; //重新定位了messageView [self.messageView setFrame:CGRectMake(30, point.y-40-20, SCREEN_WIDTH-60, 40)]; //展示地址信息的label self.addressLabel = [[UILabel alloc]initWithFrame:CGRectMake(10, 0, self.messageView.frame.size.width - 80, 40)]; self.addressLabel.font = [UIFont systemFontOfSize:13.0f]; [self.messageView addSubview:self.addressLabel]; //把地址信息传递到上个界面的button self.sureButton = [[UIButton alloc]initWithFrame:CGRectMake(self.addressLabel.frame.origin.x + self.addressLabel.frame.size.width, 0,self.messageView.frame.size.width - self.addressLabel.frame.origin.x - self.addressLabel.frame.size.width, 40)]; [self.messageView addSubview:self.sureButton]; self.sureButton.backgroundColor = [UIColor colorWithHex:0x2ecb7d]; [self.sureButton setTitle:@"确定" forState:UIControlStateNormal]; self.sureButton.titleLabel.font = [UIFont systemFontOfSize:13.0f]; [self.sureButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal]; [self.sureButton addTarget:self action:@selector(sureButtonClick:) forControlEvents:UIControlEventTouchUpInside]; [self.mapView addSubview:self.messageView]; [self