我准备好了注释,但试着弄清楚如何使用我的代码使其可拖动：
-(IBAction) updateLocation:(id)sender{
MKCoordinateRegion newRegion;
newRegion.center.latitude = mapView.userLocation.location.coordinate.latitude;
newRegion.center.longitude = mapView.userLocation.location.coordinate.longitude;
newRegion.span.latitudeDelta = 0.0004f;
newRegion.span.longitudeDelta = 0.0004f;
[mapView setRegion: newRegion animated: YES];
CLLocationCoordinate2D coordinate;
coordinate.latitude = mapView.userLocation.location.coordinate.latitude;
coordinate.longitude = mapView.userLocation.location.coordinate.longitude;
MKPointAnnotation *annotation = [[MKPointAnnotation alloc] init];
[annotation setCoordinate: coordinate];
[annotation setTitle: @"Your Car is parked here"];
[annotation setSubtitle: @"Come here for pepsi"];
[mapView addAnnotation: annotation];
[mapView setZoomEnabled: YES];
[mapView setScrollEnabled: YES];
}
提前致谢！
解决方法
要使注释可拖动,请将注释视图的draggable属性设置为YES.
这通常在viewForAnnotation委托方法中完成.
例如：
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
{
if ([annotation isKindOfClass:[MKUserLocation class]])
return nil;
static NSString *reuseId = @"pin";
MKPinAnnotationView *pav = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:reuseId];
if (pav == nil)
{
pav = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:reuseId];
pav.draggable = YES;
pav.canShowCallout = YES;
}
else
{
pav.annotation = annotation;
}
return pav;
}
如果您需要在用户停止拖动并删除注释时进行处理,请参阅：
how to manage drag and drop for MKAnnotationView on IOS?
此外,您的注释对象(实现MKAnnotation的对象)应具有可设置的坐标属性.您正在使用MKPointAnnotation类,它实现了setCoordinate,以便已经处理了部分.
