mapkit 缩放到最大比例 objective c

Question

我正在使用 mapkit。我开发了简单的故事板应用程序。

1-Mapkit 应缩放到最大比例以在加载 Mapkit 时显示用户位置。

2-单击 loc.png 时，地图应加载带有标题和副标题的位置描述以及有关位置的详细信息

- (nullable MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
    MKAnnotationView * annotationView = [mapView dequeueReusableAnnotationViewWithIdentifier:@"testAnnotationView"];
    if(annotationView == nil){
        annotationView = [[MKAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"testAnnotationView"];
        annotationView.image = [UIImage imageNamed:@"loc.png"];
        annotationView.canShowCallout = true;
    }

    return annotationView;
}

我怎样才能完成这些任务？从这个link你可以下载示例项目。https://drive.google.com/file/d/0B5pNDpbvZ8SnRExkamtmdkwzeWc/view?usp=sharing

Answer 1

使用 mapKit 的这个扩展，并根据需要调整值，如果值越低，缩放越大

已编辑

OBJECTIVE-C

.h

#import <MapKit/MapKit.h>

@interface MKMapView (Zoom)

-(void)zoomToUserLocation;

-(void)zoomToUserLocationWith:(CLLocationCoordinate2D)coordinate and:(CLLocationDistance)latitudinalMeters and:(CLLocationDistance)longitudinalMeters;

-(void)zoomToUserLocationWith:(CLLocationDistance)latitudinalMeters and:(CLLocationDistance)longitudinalMeters;

@end

.m

#import "MKMapView+Zoom.h"

@implementation MKMapView (Zoom)

/*
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect {
    // Drawing code
}
*/

-(void)zoomToUserLocation
{
    [self zoomToUserLocationWith:1000 and:1000];
}

-(void)zoomToUserLocationWith:(CLLocationCoordinate2D)coordinate and:(CLLocationDistance)latitudinalMeters and:(CLLocationDistance)longitudinalMeters
{
    [self setRegion:MKCoordinateRegionMakeWithDistance(coordinate, latitudinalMeters, longitudinalMeters)];
}

-(void)zoomToUserLocationWith:(CLLocationDistance)latitudinalMeters and:(CLLocationDistance)longitudinalMeters
{
    if(self.userLocation.location != nil){
        [self zoomToUserLocationWith:self.userLocation.location.coordinate and:latitudinalMeters and:longitudinalMeters];
    }
}
@end

使用它

[self.mapView zoomToUserLocation];

或

[self.mapView zoomToUserLocationWith:50 and:50];

或者您可以在

中使用它

- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{
    [mapView zoomToUserLocationWith:view.annotation.coordinate and:500 and:500];
}

SWIFT

  extension MKMapView {
  func zoomToUserLocation() {
     self.zoomToUserLocation(latitudinalMeters: 1000, longitudinalMeters: 1000)
  }

  func zoomToUserLocation(latitudinalMeters:CLLocationDistance,longitudinalMeters:CLLocationDistance)
  {
    guard let coordinate = userLocation.location?.coordinate else { return }
    let region = MKCoordinateRegionMakeWithDistance(coordinate, latitudinalMeters, longitudinalMeters)
    setRegion(region, animated: true)
  }

}

使用它

mapView.zoomToUserLocation()

或

mapView.zoomToUserLocation(latitudinalMeters:50,longitudinalMeters:50)

希望对您有所帮助

Answer 2

这是我编写的用于放大和缩小 WKInterfaceMap (WatchKit) 的代码，不小于其最小值 (0.0) 且不大于其最大值（世界地图的 width/height）——而且，在加速缩放的曲线上，你走得越远，缩放速度越小，你走得越近：

- (void)crownDidRotate:(WKCrownSequencer *)crownSequencer rotationalDelta:(double)rotationalDelta
{    
    span.latitudeDelta  += ((rotationalDelta * rotationalDelta) * (rotationalDelta)) + (span.latitudeDelta * rotationalDelta);
    span.longitudeDelta += ((rotationalDelta * rotationalDelta) * (rotationalDelta)) + (span.longitudeDelta * rotationalDelta);
    span.latitudeDelta   = (span.latitudeDelta < 0) ? 0  : (span.latitudeDelta  > MKCoordinateRegionForMapRect(MKMapRectWorld).span.latitudeDelta)  ? MKCoordinateRegionForMapRect(MKMapRectWorld).span.latitudeDelta  : span.latitudeDelta;
    span.longitudeDelta  = (span.longitudeDelta < 0) ? 0 : (span.longitudeDelta > MKCoordinateRegionForMapRect(MKMapRectWorld).span.longitudeDelta) ? MKCoordinateRegionForMapRect(MKMapRectWorld).span.longitudeDelta : span.longitudeDelta;
    MKCoordinateRegion visibleRegion = MKCoordinateRegionMake(PlanetaryHourDataSource.sharedDataSource.locationManager.location.coordinate, span);
    [self.map setRegion:visibleRegion];
}

这不仅可以防止无效区域（并在达到最大和最小缩放级别时向用户发出指示），而且可以确保当地图显示更多细节时缩放速度减慢，反之亦然：

<iframe src="https://player.vimeo.com/video/313729712" width="640" height="1384" frameborder="0" webkitallowfullscreen mozallowfullscreen allowfullscreen></iframe>

加速曲线是这样的：

以上答案提供了任意值，不一定对应于范围的任何一端。

mapkit 缩放到最大比例 objective c

mapkit zoom to maximum scale objective c

objective-c

zooming

mkmapview

ios

已编辑

OBJECTIVE-C

.h

.m

使用它

SWIFT

使用它