xcode 如何删除刚刚添加的一个注释？
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How to remove just added, one annotation?
提问by Pavel Kaljunen
I have a lot of annotations on the mapView and user location dot. Then, if user tap for 2 sec. on the map, I add an extra annotation with options. I need to remove that last added annotation from map by pressing the button. How can I remove it without to remove any other annotation?
我在 mapView 和用户位置点上有很多注释。然后，如果用户点击 2 秒。在地图上，我添加了一个带有选项的额外注释。我需要通过按下按钮从地图中删除最后添加的注释。如何在不删除任何其他注释的情况下删除它？
- (void)addPin:(UILongPressGestureRecognizer*)recognizer {
if(UIGestureRecognizerStateBegan == recognizer.state) {
CGPoint tappedPoint = [recognizer locationInView:mapView];
CLLocationCoordinate2D locCoord= [mapView convertPoint:tappedPoint toCoordinateFromView:mapView];
MKPointAnnotation *annot = [[MKPointAnnotation alloc] init];
annot.coordinate = locCoord;
[self.mapView addAnnotation:annot];
}
if(UIGestureRecognizerStateChanged == recognizer.state) {
// Do repeated work here (repeats continuously) while finger is down
}
if(UIGestureRecognizerStateEnded == recognizer.state) {
// Do end work here when finger is lifted
}
}
回答by pkc456
To remove all the annotations from map view:
要从地图视图中删除所有注释：
[vwMap removeAnnotations:vwMap.annotations];
PS: vwMap is the MKMap view object
PS：vwMap是MKMap视图对象
回答by Omar Abdelhafith
Do the following,
请执行下列操作，
If you have the annotation object
如果你有注解对象
[self.mapView removeAnnotation:annot];
If you have the index of the object
如果你有对象的索引
[self.mapView removeAnnotation:self.mapView.annotations.lastObject];
回答by Paresh Navadiya
Do this to remove your last added annotation in your delete Action:
这样做可以删除您在删除操作中最后添加的注释：
[self.mapView removeAnnotation:[self.mapView.annotations lastObject]];
Hope helpful
希望有帮助
回答by r farnell
I managed to remove the annotation object that is touched by doing the following, I know this wasn't the question but it may help someone out
我设法删除了通过执行以下操作触及的注释对象，我知道这不是问题，但它可能会帮助某人
set the mapView as delegate
将 mapView 设置为委托
- (void)mapView:(MKMapView *)thisMapView didSelectAnnotationView:(MKAnnotationView *)view {
MKPointAnnotation *thisTouchedAnnotation = view.annotation;
uint8_t annotationCount = thisMapView.annotations.count;
for(int i =0; i<annotationCount; i++)
{
if ([thisMapView.annotations objectAtIndex:i]==thisTouchedAnnotation){
[thisMapView removeAnnotation:[mapView.annotations objectAtIndex:i]];
break;
}
}
}
not flawless code but it may guide you :-)
不是完美的代码，但它可以指导你:-)
回答by bharathi kumar
Use this code!
使用此代码！
NSArray *array=self.mapview.annotations;
for (MKPointAnnotation *anno in array)
{
if(anno==[array lastObject])
{
[self.mapview removeAnnotation:anno];
}
}
