问题描述

IOS百度地图绘制行走轨迹

• (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);

解决方案

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

解决方案二：

解决了吗, lz, 给说说吧,咱们用的是同一个东西,我也越到同样问题了

解决方案三：

解决了吗, lz, 给说说吧,咱们用的是同一个东西,我也越到同样问题了

解决方案四：

解决了吗, lz, 给说说吧,咱们用的是同一个东西,我也越到同样问题了

解决方案五：

解决了吗, lz, 给说说吧,咱们用的是同一个东西,我也越到同样问题了

解决方案六：

解决了吗, lz, 给说说吧,咱们用的是同一个东西,我也越到同样问题了

解决方案七：

解决了吗, lz, 给说说吧,咱们用的是同一个东西,我也越到同样问题了

解决方案八：

解决了吗, lz, 给说说吧,咱们用的是同一个东西,我也越到同样问题了

解决方案九：

解决了吗, lz, 给说说吧,咱们用的是同一个东西,我也越到同样问题了

解决方案十：

大神们，我也遇到这个问题了，能给个DOME 看看，谢谢啦