提问人：Jobalisk 提问时间：11/16/2016 更新时间：11/16/2016 访问量：512
MKMapView 的折线不起作用
Polyline for MKMapView not working
问：
我一直在尝试并尝试让这条多边形线在目标 C 中工作。我已经浏览了我能找到的所有教程，但一无所获，我看不出它有什么问题。
CLLocationCoordinate2D coordinateArray2[2];
coordinateArray2[1].longitude = 176.8773669;
coordinateArray2[0].longitude = 176.88151896;
coordinateArray2[0].latitude = -39.668593;
coordinateArray2[1].latitude = -39.67018069;
_route1Line = [MKPolyline polylineWithCoordinates:coordinateArray2 count:2];
[_GPSView setDelegate:self];
[_GPSView addOverlay:_route1Line];
_testlabel.text = [NSString stringWithFormat:@"%f", coordinateArray2[0].longitude];
谁能看出出问题所在？
页眉：
#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
extern int routenumber; //holds current route ID
extern BOOL inRoute; //holds if on route or not
extern int followYou; //holds if the app should follow the user or predefined coordinates
extern NSArray *routeHolder; //holds array of routes
@interface ViewController : UIViewController <MKMapViewDelegate>
@property (weak, nonatomic) IBOutlet MKMapView *GPSView; //adding the map view to the controller
@property (nonatomic, retain) MKPolyline *route1Line; //line for this route
@property (weak, nonatomic) IBOutlet UILabel *testlabel;
@end
答：
0赞
Alex
11/16/2016
#1
我目前不在 Mac 上，所以我无法运行您的代码，但看起来您已经创建了 MKPolyline，但您缺少 MKPolylineView。
_polylineView = [MKPolylineView alloc] initWithPolyline:route1Line]; // Declare it in your header file or in the implementation's interface.
_polylineView.strokeColor = [UIColor redColor];
_polylineView.lineWidth = 5.0
然后，确保符合 MKMapViewDelegate 并实现 mapView：viewForOverlay
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay {
return _polylineView;
}
评论
0赞
OlDor
11/16/2016
您正在建议一种已弃用的方法，最好看看我的答案
3赞
OlDor
11/16/2016
#2
您应该实现以下方法：MKMapViewDelegate
- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay
{
MKOverlayPathRenderer *theOverlayPathRenderer;
{
theOverlayPathRenderer = [[MKPolylineRenderer alloc] initWithPolyline:overlay];
theOverlayPathRenderer.lineWidth = ...;
theOverlayPathRenderer.fillColor = ...;
theOverlayPathRenderer.strokeColor = ...;
}
return theOverlayPathRenderer;
}
评论