我正在使用MapKit显示位置之间的路线,我正在寻找一种方法来添加与Apple Maps应用程序中的路线注释类似的注释,其中注释显示每个路线的旅行时间(如图所示)下面).我已经正确绘制方向,手头的问题是如何计算沿路线的一对坐标.也就是说,在哪里删除注释.
我以为以某种方式使用MKDirection(它包含完整的方向,一步一步),但我不知道如何生成一对位于路线中间的坐标.
我在MapKit文档中找不到任何类型的支持.有任何想法吗？
- (void)generateRoute {
MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];
request.source = [MKMapItem mapItemForCurrentLocation];
request.destination = self.destinationMapItem;
MKDirections *directions = [[MKDirections alloc] initWithRequest:request];
[directions calculateDirectionsWithCompletionHandler:
^(MKDirectionsResponse *response,NSError *error) {
if (error) {
// Handle Error
} else {
[self showRoute:response];
}
}];
}
- (void)showRoute:(MKDirectionsResponse *)response {
[self.mapView removeOverlays:self.mapView.overlays];
for (MKRoute *route in response.routes)
{
[self.mapView addOverlay:route.polyline level:MKOverlayLevelAboveRoads];
}
[self fitRegionToRoute];
}
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id < MKOverlay >)overlay
{
MKPolylineRenderer *renderer = [[MKPolylineRenderer alloc] initWithOverlay:overlay];
renderer.strokeColor = [UIColor blueColor];
renderer.alpha = 0.7;
renderer.lineWidth = 4.0;
return renderer;
}
解决方法
问题编辑：
最后在这个答案的帮助下,它的工作.我把它添加到下面的代码中,在这里说这里有魔术：
MKMapPoint middlePoint = route.polyline.points[route.polyline.pointCount/2]; [self createAndAddAnnotationForCoordinate:MKCoordinateForMapPoint(middlePoint)];
原来的答案：
我不知道这是否会有效.只是我的想法在你的问题.
我想你会创建路线如下
(检查我的内线评论)
MKDirectionsRequest *request =
[[MKDirectionsRequest alloc] init];
request.source = [MKMapItem mapItemForCurrentLocation];
request.destination = _destination;
request.requestsAlternateRoutes = NO;
MKDirections *directions =
[[MKDirections alloc] initWithRequest:request];
[directions calculateDirectionsWithCompletionHandler:
^(MKDirectionsResponse *response,NSError *error) {
if (error) {
// Handle error
} else {
for (MKRoute *route in response.routes)
{
[_routeMap addOverlay:route.polyline level:MKOverlayLevelAboveRoads];
//Here do the magic
//MKPolyline confronts to MKOverlay so you can get the coordinate like
//route.polyline.coordinate once you get the coordinate then you can build
//a annotation. A annotation is nothing but a coordinate with some title.
//According to MKOverlay coordinate property it justs gives you the
//center point of the overlay area
[self createAndAddAnnotationForCoordinate:route.polyline.coordinate]
}
}
}];
添加注释
-(void) createAndAddAnnotationForCoordinate : (CLLocationCoordinate2D) coordinate{
MyAnnotation* annotation= [[MyAnnotation alloc] init];
annotation.coordinate = coordinate;
annotation.title = @"Any Title";
annotation.subtitle = @"Any Subtitle";
[yourMap addAnnotation: annotation];
}
