我正在与MKMapView一起使用MKPolyline绘制路线，我能够使用一组航点绘制一条路线。现在我想在MKPolyline上绘制多个MKMapView，例如蓝色从MKPolyline到28.102021, 77.10129，红色的28.20320, 77.3021从MKPolyline到28.50930, 77.89192。我该如何实现？
码：
- (void)viewDidLoad
{
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
locationManager.desiredAccuracy = 6.0;
locationManager.distanceFilter = 1.0;
[locationManager startUpdatingLocation];
locationManager.delegate = self;
map.delegate = self;
[map setShowsUserLocation:YES];
[map setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
wayPoints = [[NSMutableArray alloc] initWithCapacity:30];
newWayPoints = [[NSMutableArray alloc]initWithCapacity:10];
totalDistance = 0.0;
stopTime = [NSDate dateWithTimeIntervalSinceNow:100];
startTime = [NSDate date];
SEL sel = @selector(timerTargetMethod);
NSInvocation* inv = [NSInvocation invocationWithMethodSignature:
[self methodSignatureForSelector:sel]];
[inv setTarget:self];
[inv setSelector:sel];
stopTimer = [NSTimer scheduledTimerWithTimeInterval:5 invocation:inv repeats:true];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
if(newLocation != nil && oldLocation != newLocation)
{
tempNewLocation = newLocation;
tempOldLocation = oldLocation;
}
}
- (void)mapView:(MKMapView *)mv didAddAnnotationViews:(NSArray *)views
{
MKAnnotationView *annotationView = [views objectAtIndex:0];
id<MKAnnotation> mp = [annotationView annotation];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([mp coordinate] ,4000,4000);
[mv setRegion:region animated:YES];
}
// MKMapViewDelegate
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
MKOverlayView* overlayView = nil;
MKPolylineView * routeLineView = [[MKPolylineView alloc] initWithPolyline:self.routeLine];
routeLineView.fillColor = [UIColor colorWithRed:0.0-1.0 green:0.0-1.0 blue:0.0-1.0 alpha:1.0f];
routeLineView.strokeColor = [UIColor colorWithRed:0.0-1.0 green:0.0-1.0 blue:0.0-1.0 alpha:1.0f];
routeLineView.lineWidth = 3;
routeLineView.lineCap = kCGLineCapSquare;
overlayView = routeLineView;
return overlayView;
}
//define the targetmethod
-(void) timerTargetMethod
{
if([[NSDate date] timeIntervalSinceDate:startTime] >= 100)
{
[stopTimer invalidate];
[locationManager stopUpdatingLocation];
NSLog(@"Time started at %@", startTime);
NSLog(@"Time up at %@", stopTime);
}
else if (tempOldLocation.coordinate.latitude == tempNewLocation.coordinate.latitude && tempNewLocation.coordinate.longitude == tempOldLocation.coordinate.longitude)
{
NSLog(@" Fix location found ");
}
else if( [[NSDate date] timeIntervalSinceDate:startTime] >= 19 )
{
if(roundf([[NSDate date] timeIntervalSinceDate:startTime]) == 20)
{
NSLog(@"First Time Location Update");
latitudeLongitude.text = [[ NSString alloc] initWithFormat:@"%g , %g", tempNewLocation.coordinate.latitude, tempNewLocation.coordinate.longitude];
float interval = [[NSDate date] timeIntervalSinceDate:startTime];
int okInterval = roundf(interval);
NSLog(@"Interval 1 , %d", okInterval );
time.text = [[ NSString alloc] initWithFormat:@"%d", okInterval - 20];
speed.text = @"0";
totalDistance = 0;
distance.text = @"0 meters";
}
else
{
latitudeLongitude.text = [[ NSString alloc] initWithFormat:@"%g , %g", tempNewLocation.coordinate.latitude, tempNewLocation.coordinate.longitude];
float interval = [[NSDate date] timeIntervalSinceDate:startTime];
int okInterval = roundf(interval);
time.text = [[ NSString alloc] initWithFormat:@"%d", okInterval - 20];
NSLog(@"Interval 2 , %d , %f", okInterval , interval);
if((tempNewLocation.coordinate.latitude == tempOldLocation.coordinate.latitude && tempNewLocation.coordinate.longitude == tempOldLocation.coordinate.longitude) || tempNewLocation.speed < 0)
speed.text = @"0";
else
speed.text = [[ NSString alloc] initWithFormat:@"%g meters/sec", tempNewLocation.speed];
if(tempNewLocation.coordinate.latitude == tempOldLocation.coordinate.latitude && tempNewLocation.coordinate.longitude == tempOldLocation.coordinate.longitude)
{
}
else if ([tempNewLocation distanceFromLocation:tempOldLocation] - tempNewLocation.horizontalAccuracy >= 0)
totalDistance += [tempNewLocation distanceFromLocation:tempOldLocation] - (tempNewLocation.horizontalAccuracy / 2);
else
totalDistance += [tempNewLocation distanceFromLocation:tempOldLocation];
if (totalDistance < 0)
distance.text = @"0 meters";
else
distance.text = [[ NSString alloc] initWithFormat:@"%g meters", totalDistance];
}
[wayPoints addObject:tempNewLocation];
MKMapPoint * pointsArray =
malloc(sizeof(CLLocationCoordinate2D)*2);
pointsArray[0]= MKMapPointForCoordinate(tempOldLocation.coordinate);
pointsArray[1]= MKMapPointForCoordinate(tempNewLocation.coordinate);
routeLine = [MKPolyline polylineWithPoints:pointsArray count:2];
free(pointsArray);
if (tempNewLocation.coordinate.latitude - tempOldLocation.coordinate.latitude < 1) {
[map addOverlay:routeLine];
}
}
}
谢谢
最佳答案
您在此处显示了很多代码，唯一相关的是viewForOverlay。在其中，您将得到一个符合MKOverlay协议的对象，并且如果您创建了自己的实现类，则可以添加一个变量，该变量可用于标识此时要处理的叠加层，从而调整您的颜色。在代码的更下方，我看到您正在创建MKPolyline，这些是传递给viewForOverlay的叠加层，因为它们是从MKShape继承的，所以它们具有可以使用的title和subTitle属性。
因此，在创建MKPolyline时，您可以将title设置为“ typeA”和“ typeB”，然后在viewForOverlay中，您需要将叠加层投射到MKPolyline上，并检查它必须确定哪种颜色的标题使用：
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
if([overlay class] == MKPolyline.class)
{
MKOverlayView* overlayView = nil;
MKPolyline* polyline = (MKPolyline *)overlay;
MKPolylineView * routeLineView = [[MKPolylineView alloc] initWithPolyline:polyline];
if([polyline.title isEqualToString:@"typeA"])
{
routeLineView.fillColor = [UIColor redColor];
routeLineView.strokeColor = [UIColor redColor];
} else {
routeLineView.fillColor = [UIColor blueColor];
routeLineView.strokeColor = [UIColor blueColor];
}
routeLineView.lineWidth = 3;
routeLineView.lineCap = kCGLineCapSquare;
overlayView = routeLineView;
return overlayView;
} else {
return nil;
}
}