iOS - MKMapView - 可拖动注释 [英] iOS - MKMapView - Draggable Annotations
问题描述
我已准备好注释,但正在尝试弄清楚如何使用我的代码使其可拖动:
I have the annotation ready to go, but trying to figure out on how to make it draggable with my code:
-(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!
推荐答案
要使注解可拖动,请将注解view的 draggable
属性设置为 YES代码>.
To make an annotation draggable, set the annotation view's draggable
property to YES
.
这通常在 viewForAnnotation
委托方法中完成.
This is normally done in the viewForAnnotation
delegate method.
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;
}
如果需要在用户停止拖放注释时进行处理,请参阅:
如何在 IOS 上管理 MKAnnotationView 的拖放?
此外,您的注释对象(实现 MKAnnotation
的对象)应该具有可设置的 coordinate
属性.您正在使用 MKPointAnnotation
类,它确实实现了 setCoordinate
,因此该部分已经处理完毕.
In addition, your annotation object (the one that implements MKAnnotation
) should have a settable coordinate
property. You are using the MKPointAnnotation
class which does implement setCoordinate
so that part's already taken care of.
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