Question

我会在mapview中插入折线！我这样做了

 CLLocationCoordinate2D coord[2];
coord[1].latitude = 45.42207;
coord[1].longitude = 9.123888;
coord[2].latitude = 45.422785;
coord[2].longitude = 9.12377;

MKPolyline *polyline = [[MKPolyline alloc] init];
polyline = [MKPolyline polylineWithCoordinates:coord count:2];

[self.mapView addAnnotation:polyline];

但是不起作用并且出现此错误：EXC_BAD_ACCESS。怎么了？

Answer 1

C中的数组索引从索引0开始，而不是1：

CLLocationCoordinate2D coord[2];
coord[0].latitude = 45.42207;
coord[0].longitude = 9.123888;
coord[1].latitude = 45.422785;
coord[1].longitude = 9.12377;

Answer 2

试试这个

CLLocationCoordinate2D coord[2];
coord[0].latitude = 45.42207;
coord[0].longitude = 9.123888;
coord[1].latitude = 45.422785;
coord[1].longitude = 9.12377;

MKPolyline *polyline = [[MKPolyline alloc] init];
polyline = [MKPolyline polylineWithCoordinates:coord count:2];


- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay {

    MKPolylineView *polyLineView = [[MKPolylineView alloc] initWithPolyline:polyline];
    polyLineView.fillColor = [UIColor blueColor];
    polyLineView.strokeColor = [UIColor greenColor];
    polyLineView.lineWidth = 7;
    return polyLineView;
}

如何在mapView中添加折线

2 个答案: