IOS 自定义 pin 未显示

Question

我正在尝试显示图像，而不是源位置的默认红色图钉和目标位置的另一个图像。

- (void) sourceMarker:(MKPlacemark * ) homeLoc {
MKAnnotationView *point = [[MKAnnotationView alloc] init];

MKPointAnnotation *ml = point.annotation;

ml.coordinate = homeLoc.coordinate;

ml.title = @"Home";

point.image = [UIImage imageNamed:@"home.png"];
point.canShowCallout = YES;

[self.mapView addAnnotation:ml];
}

Answer 1

按照 Apple 文档 Annotating Maps 的建议。必须创建自定义注释类，请引用以下代码。

MyAnnotation.h

@interface MyAnnotation : NSObject<MKAnnotation>
{
CLLocationCoordinate2D coordinate;
NSString *title;
NSString *subtitle;
NSString *type;

}

 @property (nonatomic, assign) CLLocationCoordinate2D coordinate;
 @property (nonatomic, copy) NSString *title;
 @property (nonatomic, copy) NSString *subtitle;
 @property (nonatomic, copy) NSString *type;
@end

MyAnnotation.m

@implementation MyAnnotation
  @synthesize coordinate;
  @synthesize title;
  @synthesize subtitle;
  @synthesize type;

@end

yourViewControll.m - 您显示 map 的位置。

创建注释并设置类型属性

MyAnnotation *Ann = [[MyAnnotation alloc] init];
offAnn.coordinate = offLocation.coordinate;
offAnn.title = @"My Office";
offAnn.type = @"Office";
[_mapView  removeAnnotation: offAnn];
[_mapView addAnnotation: offAnn];




- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
NSLog(@"viewForAnnotation Called");
if ([annotation isKindOfClass:[MyAnnotation class]])
{
    MyAnnotation *myAnn=(MyAnnotation *)annotation;

    MKAnnotationView *pinView = (MKAnnotationView*)[self.mapView dequeueReusableAnnotationViewWithIdentifier:@"MyAnnotation"];
    if (!pinView)
    {
        pinView = [[MKAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"MyAnnotation"];
        //pinView.animatesDrop = YES;
        pinView.canShowCallout = YES;
        pinView.calloutOffset = CGPointMake(0, 4);

    } else {
        pinView.annotation = annotation;
    }
    if([myAnn.type  isEqual: @"Office"]) {
        pinView.image = [UIImage imageNamed:@"office.png"];
    }
    return pinView;
}
return nil;
}