我有mapView，假设包含用户位置引脚和对象引脚。我想要的是显示屏幕，包含两个引脚，无论它们之间的距离有多大(它应该不是太多)。由于某些原因，我无法显示用户位置，屏幕移动到海洋中的某个点。这是我的代码，并试图得到它:
-(MKCoordinateRegion)regionForAnnotations:(NSArray*)annotations{
MKCoordinateRegion region;
if ([annotations count] ==0){
region = MKCoordinateRegionMakeWithDistance(self.mapView.userLocation.coordinate, 1000, 1000);
} else if ([annotations count] ==1 ){
id <MKAnnotation> annotation = [annotations lastObject];
region = MKCoordinateRegionMakeWithDistance(annotation.coordinate, 1000, 1000);
} else {
CLLocationCoordinate2D topLeftCord;
topLeftCord.latitude = -90;
topLeftCord.longitude = 180;
CLLocationCoordinate2D bottomRightCord;
bottomRightCord.latitude = 90;
bottomRightCord.longitude = -180;
for (id <MKAnnotation> annotation in annotations){
topLeftCord.latitude = fmax(topLeftCord.latitude, annotation.coordinate.latitude);
topLeftCord.longitude = fmin(topLeftCord.longitude, annotation.coordinate.longitude);
bottomRightCord.latitude = fmin(bottomRightCord.latitude, annotation.coordinate.latitude);
bottomRightCord.longitude = fmax(bottomRightCord.longitude, annotation.coordinate.longitude);
}
const double extraSpace = 1.1;
region.center.longitude = topLeftCord.longitude - (topLeftCord.longitude - bottomRightCord.longitude)/2.0;
region.center.latitude = topLeftCord.latitude - (topLeftCord.latitude - bottomRightCord.latitude)/2.0;
region.span.latitudeDelta = fabs(topLeftCord.latitude - bottomRightCord.latitude)*extraSpace;
region.span.longitudeDelta = fabs(topLeftCord.longitude - bottomRightCord.longitude)*extraSpace;
}
return [self.mapView regionThatFits:region];
}
-(MKAnnotationView*)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{
//2
static NSString *identifier = @"Location";
MKPinAnnotationView *annotationView = (MKPinAnnotationView*)[self.mapView dequeueReusableAnnotationViewWithIdentifier:identifier];
if (annotationView == nil){
annotationView = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:identifier];
}
//3
annotationView.enabled = YES;
annotationView.canShowCallout = YES;
annotationView.animatesDrop = YES;
annotationView.pinColor = MKPinAnnotationColorPurple;
//4
UIButton *rightButton = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
[rightButton addTarget:self action:@selector(getRoute:) forControlEvents:UIControlEventTouchUpInside];
annotationView.rightCalloutAccessoryView = rightButton;
return annotationView;
};
-(void)setEntityCoordiate{
CLLocationCoordinate2D location;
location.latitude = [self.latitudeString doubleValue];
location.longitude = [self.longitudeString doubleValue];
CLLocationCoordinate2D user;
user.latitude = self.mapView.userLocation.coordinate.latitude;
user.latitude = self.mapView.userLocation.coordinate.longitude;
CLLocation *userLocation = [[CLLocation alloc]initWithLatitude:user.latitude longitude:user.longitude ];
CLLocation *entityLocation = [[CLLocation alloc]initWithLatitude:location.latitude longitude:location.longitude];
MKCoordinateSpan span;
span.latitudeDelta = 100;
span.longitudeDelta = 100;
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(location, 400, 400);
[self.mapView setRegion:[self.mapView regionThatFits:region] animated:YES];
MKPointAnnotation *annotation = [[MKPointAnnotation alloc] init];
annotation.coordinate = location;
annotation.title = _titleForEntity;
[_locations addObject:userLocation];
[_locations addObject:entityLocation];
[_mapView addAnnotation:annotation];
}
-(void)getRoute:(UIButton*)button{
MKCoordinateRegion region = [self regionForAnnotations:_locations];
[self.mapView setRegion:region animated:YES];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self setEntityCoordiate];
}
可能有"太多"的代码，但我不知道我在哪里犯了错误，我粘贴它。我想我可能有问题的数组包含位置对象。
如何最终使屏幕与这两个位置?任何建议将不胜感激，谢谢!
尝试创建一个区域flyTo，将"包含"您给定的注释:
MKMapRect flyTo = MKMapRectNull;
for (id <MKAnnotation> annotation in annotations) {
MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 0);
if (MKMapRectIsNull(flyTo)) {
flyTo = pointRect;
} else {
flyTo = MKMapRectUnion(flyTo, pointRect);
}
}
mapview.visibleMapRect = flyTo;