viewForAnnotation没有移动userLocation [英] viewForAnnotation didn't moves the userLocation
问题描述
我已经实现了- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
方法来更改userLocation注释的默认位置.在此方法中,我使用了:
I've implemented - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation {
method to change the default location of userLocation Annotation. Inside this method I've used:
if (annotation==(mapView.userLocation)) {
MKAnnotationView *myAnotation = [[MKAnnotationView alloc] init];
myAnotation.image = self.userPointImage.image;
myAnotation.centerOffset = CGPointMake(0, 250);
return myAnotation;
}
else
{
return nil;
}
已成功将默认的userLocation注释移至底部中央.但是由于我也在使用标题,因此在移动手机时,它仍会从中心旋转地图.
Which successfully moves the default userLocation annotation to center bottom. But as I'm also using heading so when move my phone it is still rotating the map from center.
- (void)locationManager:(CLLocationManager *) manager didUpdateHeading:(CLHeading *) newHeading {
[self.mapView setUserTrackingMode:MKUserTrackingModeFollowWithHeading animated:true];
}
但是userLocation注释在下面.那么该怎么做呢?
更新
我发现
But the userLocation annotation is below. So how to do that?
UPDATE
I found this question and tried applying it. But as I'm using heading so it crashes the app.
In my didUpdateUserLocation
method I added [self moveCenterByOffset:CGPointMake(0, 200) from:userLocation.coordinate];
and this method is as follows:
- (CLLocationCoordinate2D)moveCenterByOffset:(CGPoint)offset from:(CLLocationCoordinate2D)coordinate
{
CGPoint point = [self.mapView convertCoordinate:coordinate toPointToView:self.mapView];
point.x += offset.x;
point.y += offset.y;
CLLocationCoordinate2D center = [self.mapView convertPoint:point toCoordinateFromView:self.mapView];
return center;
}
,然后在我的didUpdateUserLocation
方法中将其更新为:MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([self moveCenterByOffset:CGPointMake(0, -250) from:userLocation.coordinate], 800.0f, 200.0f);
和[mapView setRegion:region animated:NO];
,因为我正在使用标题,因此动画设置为NO
.但是现在,当我运行代码时,它开始在中心和新点之间抽动.
and then in my didUpdateUserLocation
method I updated it as: MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance([self moveCenterByOffset:CGPointMake(0, -250) from:userLocation.coordinate], 800.0f, 200.0f);
and [mapView setRegion:region animated:NO];
as I'm using heading so animation is set to NO
. But now as I run the code it starts jerking between center and the new point.
推荐答案
MKCoordinateRegion region = mapClinicsView.region;
MKCoordinateRegion region = mapClinicsView.region;
设置"region.center" 它将帮助您导航地图中心位置
set 'region.center' It will helps you to navigate your map center position
确保'region.center'和注释中心的经纬度和经度相同
make sure 'region.center' and annotation center latitute and longitute is same
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