xcode iOS - MKMapView - 可拖动注释
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iOS - MKMapView - Draggable Annotations
提问by Kenny L.
I have the annotation ready to go, but trying to figure out on how to make it draggable with my code:
我已经准备好了注释，但我试图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];
}
Thanks in advance!
提前致谢！
回答by
To make an annotation draggable, set the annotation view'sdraggableproperty to YES.
要使注释可拖动，请将注释视图的draggable属性设置为YES。
This is normally done in the viewForAnnotationdelegate method.
这通常在viewForAnnotation委托方法中完成。
For example:
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;
}
If you need to handle when the user stops dragging and drops the annotation, see:
how to manage drag and drop for MKAnnotationView on IOS?
如果需要在用户停止拖放注解时进行处理，请参阅：
如何在IOS上管理MKAnnotationView的拖放？
In addition, your annotation object (the one that implements MKAnnotation) should have a settable coordinateproperty. You are using the MKPointAnnotationclass which does implement setCoordinateso that part's already taken care of.
此外，您的注释对象（实现 的对象MKAnnotation）应该有一个可设置的coordinate属性。您正在使用MKPointAnnotation确实实现的类，setCoordinate因此该部分已经得到处理。
