如何在MapView中添加多个颜色引脚

Question

我的地图具有3个类别的兴趣点。目前，我让它们可以显示，但是它们都是相同的颜色。我该如何根据他们所处的类别来显示颜色？

我已经四处搜索，找不到我可以理解的任何应用于我的代码的东西。

这是我当前注释引脚的代码：

-(void)pins:(NSString *)name lat:(NSString *)lat lon:(NSString *)lon poiID:(NSString *)poiID
{
    //cast string to float
    CGFloat Lat = (CGFloat)[lat floatValue];
    CGFloat Lon = (CGFloat)[lon floatValue];
    //Set coordinates of pin
    CLLocationCoordinate2D coordinate;
    coordinate.latitude = Lat;
    coordinate.longitude = Lon;
    //Create Pin
    MKPointAnnotation *annotation = [[MKPointAnnotation alloc] init];
    //set details
    [annotation setCoordinate:coordinate];
    [annotation setTitle:name];
    [annotation setAccessibilityLabel:poiID]; //set the label eq to the id so we know which poi page to go to

    // Add pin to map
    [self.showMapView addAnnotation:annotation];
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
    //create annotation
    MKPinAnnotationView *pinView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:@"pinView"];
    if (!pinView) {
        pinView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"pinView"];
        pinView.pinColor = MKPinAnnotationColorRed;
        pinView.animatesDrop = FALSE;
        pinView.canShowCallout = YES;
        //details button
        UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
        pinView.rightCalloutAccessoryView = rightButton;
    } else {
        pinView.annotation = annotation;
    }
    return pinView;
}

这是我的其余代码，它是需要的。

感谢您的任何帮助。

Answer 1

足够简单，只需添加一个IF语句以检查标题或字幕即可。当我使用地图时，我的注释课带有一个字幕，在这里说明了什么地方，即酒店，机场等我希望PIN

if([annotation.subtitle isEqualToString:@"Hotel"])
    {
        pinView.animatesDrop=YES;
        pinView.pinColor=MKPinAnnotationColorPurple;

    }else if([annotation.subtitle isEqualToString:@"Airport"])
    {
      pinView.animatesDrop=YES;
        pinView.pinColor=MKPinAnnotationColorRed;
    }

，或者如果您希望它是图像，只需使用

pinView.image = [UIImage imageNamed:@"airportMarker.png"];

编辑：更新的代码

创建一个自定义注释类

@interface MyAnnotation : NSObject<MKAnnotation> 
{
    CLLocationCoordinate2D  coordinate;
    NSString*               title;
    NSString*               subtitle;
    NSInteger categoryID;
}
@property NSInteger categoryID;
@property (nonatomic, assign)   CLLocationCoordinate2D  coordinate;
@property (nonatomic, copy)     NSString*               title;
@property (nonatomic, copy)     NSString*               subtitle;
@end

然后，当您将对象添加到屏幕上时，给每个一个一个ID，即

CLLocationCoordinate2D hotelCoordinates1;
hotelCoordinates1.latitude = 35.38355;
hotelCoordinates1.longitude = 1.11004;
MyAnnotation* exampleHotel=[[MyAnnotation alloc] init];
exampleHotel.coordinate=hotelCoordinates1;
exampleHotel.title=@"Example Hotel";
exampleHotel.subtitle=@"Hotel";
exampleHotel.categoryID = 1;

然后在此方法中

- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation {
    //create annotation

只是做这个

if([(MyAnnotation*)annotation categoryID] == 1)
        {
        }

您需要确保将注释投入到创建的班级名称的任何名称中。就是这样。希望有帮助！

Answer 2

- (MKAnnotationView *)mapView:(MKMapView *)mV viewForAnnotation:(id <MKAnnotation>)annotation {
   static NSString *AnnotationViewID = @"annotationViewID";
    MKAnnotationView *annotationView = (MKAnnotationView *)[MymapView dequeueReusableAnnotationViewWithIdentifier:AnnotationViewID];
    if (annotationView == nil)
    {
        annotationView = [[[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:AnnotationViewID] autorelease];
    }
    if (annotation == MymapView.userLocation)
        return nil;
    /////i give just an example with category 
    if(category == 1){
       annotationView.image = [UIImage imageNamed:@"Category1.png"];
    }
    else if(category == 2){
       annotationView.image = [UIImage imageNamed:@"Category2.png"];
    }
    annotationView.annotation = annotation;
    annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
    annotationView.rightCalloutAccessoryView.tag = 101;
    annotationView.canShowCallout = YES;
    return annotationView;
}

Answer 3

您必须覆盖mkannotation类并定义specyfif字段，在此声明类别ID。当您在地图上创建注释时，将ID设置为ID，并在委托ViewForantation上检查ID注释，并检查当前ID的PIN所需的颜色。

您还可以查看此帖子，以查看如何发表Ovveride Mkannotation类：Mkannotation