覆盖地图视图未显示

Question

我正在尝试制作 MKMapView 并使用坐标添加和覆盖它。它没有显示在 mapView 中。

它似乎编译正常，但是当我在故事板中打开 mapView 视图时，我看到了世界地图，但任何地方都没有红色覆盖。

这是我的代码。

我的header

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#import <AVFoundation/AVFoundation.h>
#import <CoreMotion/CoreMotion.h>
#import <MapKit/MapKit.h>
NS_ASSUME_NONNULL_BEGIN

@interface mapViewController : UIViewController<CLLocationManagerDelegate,MKMapViewDelegate>

@property (nonatomic, retain) IBOutlet MKMapView *mapView;

@property(nonatomic, retain) MKPolygon *polygon;

@end

和我的 .m 文件

#import "mapViewController.h"

@interface mapViewController ()

@end

@implementation mapViewController
@synthesize mapView,locationManager,polygon;
- (void)viewDidLoad {
    [super viewDidLoad];
    mapView.delegate = self;
    NSDictionary *d1=[NSDictionary dictionaryWithObjectsAndKeys:@"37.57111111",@"x",@"-109.52166667",@"y",nil];
    NSDictionary *d2=[NSDictionary dictionaryWithObjectsAndKeys:@"32.01138889",@"x",@"-109.59000000",@"y",nil];
    NSDictionary *d3=[NSDictionary dictionaryWithObjectsAndKeys:@"31.83166667",@"x",@"-111.95416667",@"y",nil];
    NSDictionary *d4=[NSDictionary dictionaryWithObjectsAndKeys:@"32.34250000",@"x",@"-115.14333333",@"y",nil];
    NSDictionary *d5=[NSDictionary dictionaryWithObjectsAndKeys:@"34.89722222",@"x",@"-115.47611111",@"y",nil];
    NSDictionary *d6=[NSDictionary dictionaryWithObjectsAndKeys:@"37.32083333",@"x",@"-116.02027778",@"y",nil];
    NSDictionary *d7=[NSDictionary dictionaryWithObjectsAndKeys:@"37.53305556",@"x",@"-114.73416667",@"y",nil];
    NSDictionary *d8=[NSDictionary dictionaryWithObjectsAndKeys:@"37.53166667",@"x",@"-114.11277778",@"y",nil];
    NSDictionary *d9=[NSDictionary dictionaryWithObjectsAndKeys:@"37.57111111",@"x",@"-109.52166667",@"y",nil];


    NSArray *azcoord = [NSArray arrayWithObjects:d1,d2,d3,d4,d5,d6,d7,d8, nil];
    CLLocationCoordinate2D coordinates[azcoord.count];

    int coordinatesIndex = 0;

    for (NSDictionary * c in azcoord) {
        double x = [[c valueForKey:@"x"] doubleValue];
        double y = [[c valueForKey:@"y"] doubleValue];

        CLLocationCoordinate2D coordinate;
        coordinate.latitude = y;
        coordinate.longitude = x;

        //Put this coordinate in the C array...
        coordinates[coordinatesIndex] = coordinate;

        coordinatesIndex++;
    }

    polygon = [MKPolygon polygonWithCoordinates:coordinates count:azcoord.count];


    [self.mapView addOverlay:polygon];


}

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay
{
    MKPolygonRenderer *renderer = [[MKPolygonRenderer alloc] initWithPolygon:polygon];
    renderer.fillColor   = [[UIColor redColor] colorWithAlphaComponent:1];
    renderer.strokeColor = [[UIColor blackColor] colorWithAlphaComponent:0.7];
    renderer.lineWidth   = 2;
    return renderer;
}



@end

我想要做的是为亚利桑那州绘制一个叠加层。我已经检查了坐标，它们是正确的。

最终我想为所有州创建叠加层。

谁能看出我错在哪里？

Answer 1

我通过改变我的方法弄明白了。这是我正在运行的代码。首先，我创建一个坐标的 CLLocationCoordinate2D 数组，并将它们变成一个多边形。然后添加到 mapView。

CLLocationCoordinate2D points[7];
    points [0] = CLLocationCoordinate2DMake(36.99910000, -109.04520000);
    points [1] = CLLocationCoordinate2DMake(31.33460000, -109.05220000);
    points [2] = CLLocationCoordinate2DMake(31.33700000, -111.07720000);
    points [3] = CLLocationCoordinate2DMake(32.49410000, -114.81360000);
    points [4] = CLLocationCoordinate2DMake(36.10660000, -114.75180000);
    points [5] = CLLocationCoordinate2DMake(36.21600000, -114.03940000);
    points [6] = CLLocationCoordinate2DMake(37.00150000, -114.04820000);


    polygon = [MKPolygon polygonWithCoordinates:points count:7];


   [self.mapView addOverlay:polygon];

然后我将其渲染到地图视图。

- (MKOverlayRenderer *)mapView:(MKMapView *)mapView rendererForOverlay:(id<MKOverlay>)overlay
{ NSLog(@"YES!!!!!!!!!!!!!!!!!");
    MKPolygonRenderer *renderer = [[MKPolygonRenderer alloc] initWithPolygon:polygon];
    renderer.fillColor   = [[UIColor redColor] colorWithAlphaComponent:0.2];
    renderer.strokeColor = [[UIColor blackColor] colorWithAlphaComponent:0.7];
    renderer.lineWidth   = 1;
    return renderer;
}

然后我检查我的位置是否在多边形内。

CLLocationCoordinate2D sampleLocation = CLLocationCoordinate2DMake(myLatitude,myLongitude);//13,80 is the latlong of clear colored area of the MKPolygon in the below image.
    MKMapPoint mapPoint = MKMapPointForCoordinate(sampleLocation);
    CGPoint mapPointAsCGP = CGPointMake(mapPoint.x, mapPoint.y);

    for (id<MKOverlay> polygon in mapView.overlays) {
        if([polygon isKindOfClass:[MKPolygon class]]){
            NSLog(@"YES<<<<<<<<<<<<<<<<<<");
            MKPolygon *polygons = (MKPolygon*) polygon;

            CGMutablePathRef mpr = CGPathCreateMutable();

            MKMapPoint *polygonPoints = polygons.points;

            for (int p=0; p < polygons.pointCount; p++){
                MKMapPoint mp = polygonPoints[p];
                if (p == 0)
                    CGPathMoveToPoint(mpr, NULL, mp.x, mp.y);
                else
                    CGPathAddLineToPoint(mpr, NULL, mp.x, mp.y);
            }

            if(CGPathContainsPoint(mpr , NULL, mapPointAsCGP, TRUE)){
                NSLog(@"YES?????????????????????????????????");

//做点别的 }

            CGPathRelease(mpr);
        }
    }

起初我不想添加地图视图，但后来决定我需要添加，现在我喜欢它。

覆盖地图视图未显示

overlay map view not showing up

objective-c

mapkit

ios

mkoverlay