在Xcode中的两个坐标之间绘制折线

我想在地图上的两个或多个给定的坐标之间绘制多边形线（多边线而不是路线）。 想象一下，我在地图上有2个丢弃的引脚，我需要从第一个丢弃的引脚到第二个丢弃的引脚绘制一条直线。

Answer 1

在接口文件中

MKPolyline* _routeLine; MKPolylineView* _routeLineView; 

在实现文件中

将所有坐标存储在

 NSMutablrArray *routeLatitudes 

然后

 MKMapPoint* pointArr = malloc(sizeof(CLLocationCoordinate2D) * [routeLatitudes count]); for(int idx = 0; idx < [routeLatitudes count]; idx++) { CLLocationCoordinate2D workingCoordinate; workingCoordinate.latitude=[[routeLatitudes objectAtIndex:idx] doubleValue]; workingCoordinate.longitude=[[routeLongitudes objectAtIndex:idx] doubleValue]; MKMapPoint point = MKMapPointForCoordinate(workingCoordinate); pointArr[idx] = point; } // create the polyline based on the array of points. routeLine = [MKPolyline polylineWithPoints:pointArr count:[routeLatitudes count]]; [mapViewHome addOverlay:self.routeLine]; free(pointArr); 

和覆盖委托

 - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay { MKOverlayView* overlayView = nil; if(overlay == routeLine) { routeLineView = [[[MKPolylineView alloc] initWithPolyline:self.routeLine] autorelease]; routeLineView.fillColor = [UIColor colorWithRed:0.945 green:0.027 blue:0.957 alpha:1]; routeLineView.strokeColor = [UIColor colorWithRed:0.945 green:0.027 blue:0.957 alpha:1]; routeLineView.lineWidth = 4; overlayView = routeLineView; } return overlayView; } 

希望这可以帮助

编辑的代码

这里是获取NsMutableArray坐标的代码。

调用这个函数

 NSString * saddr = [NSString stringWithFormat:@"%f,%f",StartCoordinate.latitude, StartCoordinate.longitude]; NSString* daddr = [NSString stringWithFormat:@"%f,%f",EndCoordinate.latitude, EndCoordinate.longitude]; routeLatitudes=[[[self getDirectionRoutesFrom:[saddr copy] to:[daddr mutableCopy]] mutableCopy] retain]; 

函数定义

  -(NSMutableArray *)getDirectionRoutesFrom:(NSString *)saddr1 to:(NSString *)daddr { NSString* apiUrlStr = [NSString stringWithFormat:@"http://maps.google.com/maps?output=dragdir&saddr=%@&daddr=%@", saddr1, daddr]; NSURL* apiUrl = [NSURL URLWithString:apiUrlStr]; //NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl]; NSString *apiResponse = [NSString stringWithContentsOfURL:apiUrl encoding:NSUTF8StringEncoding error:nil]; NSString* encodedPoints = [apiResponse stringByMatching:@"points:\\\"([^\\\"]*)\\\"" capture:1L]; //NSMutableArray *temparr=[[MapViewController decodePolyLine:[encodedPoints mutableCopy]] retain]; return [[self decodePolyLine:[encodedPoints mutableCopy]] retain]; //return temparr; } 

和

  -(NSMutableArray *)decodePolyLine: (NSMutableString *)encoded { [encoded replaceOccurrencesOfString:@"\\\\" withString:@"\\" options:NSLiteralSearch range:NSMakeRange(0, [encoded length])]; NSInteger len = [encoded length]; NSInteger index = 0; NSMutableArray *array = [[[NSMutableArray alloc] init] autorelease]; NSInteger lat=0; NSInteger lng=0; while (index < len) { NSInteger b; NSInteger shift = 0; NSInteger result = 0; do { b = [encoded characterAtIndex:index++] - 63; result |= (b & 0x1f) << shift; shift += 5; } while (b >= 0x20); NSInteger dlat = ((result & 1) ? ~(result >> 1) : (result >> 1)); lat += dlat; shift = 0; result = 0; do { b = [encoded characterAtIndex:index++] - 63; result |= (b & 0x1f) << shift; shift += 5; } while (b >= 0x20); NSInteger dlng = ((result & 1) ? ~(result >> 1) : (result >> 1)); lng += dlng; NSNumber *latitude = [[[NSNumber alloc] initWithFloat:lat * 1e-5] autorelease]; NSNumber *longitude = [[[NSNumber alloc] initWithFloat:lng * 1e-5] autorelease]; printf("[%f,", [latitude doubleValue]); printf("%f]", [longitude doubleValue]); CLLocation *loc = [[[CLLocation alloc] initWithLatitude:[latitude floatValue] longitude:[longitude floatValue]] autorelease]; [array addObject:loc]; } return array; } 

在你的文件中包含RegexKitLite.h。