ios - 如何在 iOS 中通过 map-kit 在两点之间绘制折线？

Question

我有两点然后如何绘制折线但折线不来我在

中这样声明

.m文件

     - (void)viewDidLoad {
        [super viewDidLoad];

    double currentLatitude = [[NSUserDefaults standardUserDefaults] doubleForKey:@"currentLatitude"];

     double currentLongitude = [[NSUserDefaults standardUserDefaults] doubleForKey:@"currentLatitude"];

    double shopLatitude = [[NSUserDefaults standardUserDefaults] doubleForKey:@"shopLatitude"];         
        double shopLongitude = [[NSUserDefaults standardUserDefaults] doubleForKey:@"shopLongitude"];

           CLLocationCoordinate2D coordinateArray[2];
        coordinateArray[0] = CLLocation Coordinate 2D Make(currentLatitude, currentLongitude);

        coordinateArray[1] = CLLocation Coordinate 2D Make(shopLatitude,shopLongitude);



        self.routeLine = [MK Poly line poly lineWithCoordinates:coordinateArray count:2];
        [self.mapView setVisibleMapRect:[self.routeLine boundingMapRect]];
        [self.mapView addOverlay:self.routeLine];

    }

我们将不胜感激。

Answer 1

1) 添加MKMapViewDelegate

#import <MapKit/MapKit.h>

@interface YourViewController : UIViewController <MKMapViewDelegate>

2) 设置委托(delegate)

self.mapView.delegate = self;

3) 实现viewForOverlay

- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
    MKPolylineView *polylineView = [[MKPolylineView alloc] initWithPolyline:overlay];
    polylineView.strokeColor = [UIColor redColor];
    polylineView.lineWidth = 1.0;
    return polylineView;
}