IOS百度地图绘制行走轨迹

Question

• (void)viewDidLoad
  {
  [super viewDidLoad];
  // Do any additional setup after loading the view from its nib.

  self.mapView = [[BMKMapView alloc] initWithFrame:CGRectMake(0, 0, 320, 520)];
  self.mapView.showsUserLocation = YES;
  [self.view addSubview:_mapView];
  [self configureRoutes];
  }

-(void)configureRoutes
{
// define minimum, maximum points定义最小值,最大值点
BMKMapPoint northEastPoint;

BMKMapPoint southWestPoint;

BMKMapPoint* pointArr = new BMKMapPoint[_locationPoint.count];

// char*str=(char )malloc(8);
就是卡死到这了！！！！！ BMKMapPoint pointArray = malloc(sizeof(CLLocationCoordinate2D) * _locationPoint.count);

for(int idx = 0; idx < _locationPoint.count; idx++)
{
    CLLocation *location = [_locationPoint objectAtIndex:idx];
    CLLocationDegrees latitude  = location.coordinate.latitude;
    CLLocationDegrees longitude = location.coordinate.longitude;

    // create our coordinate and add it to the correct spot in the array 创建我们的坐标数组中,并将它添加到正确的位置
    CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(latitude, longitude);
    BMKMapPoint point = BMKMapPointForCoordinate(coordinate);

    // if it is the first point, just use them, since we have nothing to compare to yet. 如果是第一点,只使用他们,因为我们没有比较
    if (idx == 0) {
        northEastPoint = point;
        southWestPoint = point;
    } else {
        if (point.x > northEastPoint.x)
            northEastPoint.x = point.x;
        if(point.y > northEastPoint.y)
            northEastPoint.y = point.y;
        if (point.x < southWestPoint.x)
            southWestPoint.x = point.x;
        if (point.y < southWestPoint.y)
            southWestPoint.y = point.y;
    }

    pointArr[idx] = point;
}
//表示路由的数据点
if (self.routeLine) {
    //在地图上移除已有的坐标点
    [self.mapView removeOverlay:self.routeLine];
}

self.routeLine = [BMKPolyline polylineWithPoints:pointArr count:_locationPoint.count];

// add the overlay to the map.覆盖添加到地图
if (nil != self.routeLine) {
    [self.mapView addOverlay:self.routeLine];
}

// clear the memory allocated earlier for the points,清楚点的早些时候分配的内存
free(pointArr);

}

• (BMKOverlayView*)mapView:(BMKMapView )map viewForOverlay:(id)overlay { if ([overlay isKindOfClass:[BMKPolyline class]]) { BMKPolylineView polylineView = [[[BMKPolylineView alloc] initWithOverlay:overlay] autorelease]; polylineView.fillColor = [[UIColor cyanColor] colorWithAlphaComponent:1]; polylineView.strokeColor = [[UIColor blueColor] colorWithAlphaComponent:0.7]; polylineView.lineWidth = 3.0; return polylineView; } return nil; }

• (void)mapView:(BMKMapView *)mapView didUpdateUserLocation:(BMKUserLocation *)userLocation
  {
  CLLocation *location = [[CLLocation alloc] initWithLatitude:userLocation.coordinate.latitude
  longitude:userLocation.coordinate.longitude];

  // check the zero point检查零点
  if (userLocation.coordinate.latitude == 0.0f ||
  userLocation.coordinate.longitude == 0.0f)
  return;

  // check the move distance检查移动的距离
  if (_locationPoint.count > 0) {
  CLLocationDistance distance = [location distanceFromLocation:_currentLocation];
  if (distance < 5)
  return;
  }

  if (nil == _locationPoint) {
  _locationPoint = [[NSMutableArray alloc] init];
  }

  [_locationPoint addObject:location];
  _currentLocation = location;

  NSLog(@"points: +++++++++++++++++++++%@", _locationPoint);

  [self configureRoutes];

  CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(userLocation.coordinate.latitude, userLocation.coordinate.longitude);
  [self.mapView setCenterCoordinate:coordinate animated:YES];

}

-(void)viewWillAppear:(BOOL)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

}

-(void)viewWillDisappear:(BOOL)animated {
[_mapView viewWillDisappear];
_mapView.delegate = nil; // 不用时，置nil

}

• (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } -(void)dealloc { [_mapView release]; [super dealloc]; }

@end
这是我参照高德地图的一个demo写的，到了动态分配内存的时候就卡那了，一直提示错误，解决不了，求大神帮忙。
BMKMapPoint* pointArray = malloc(sizeof(CLLocationCoordinate2D) * _locationPoint.count);

Answer 1

BMKMapPoint* pointArray = (BMKMapPoint *)malloc(sizeof(CLLocationCoordinate2D) * _locationPoint.count);试试