地图应用经常会涉及到线路的绘制问题，ios下可以使用MKMapView进行地图开发，使用

MKOverlayView进行线路的绘制。

使用MKMapView添加MKMap.framework 和CoreLocation.framework并导入

MapKit.h头文件。

新建一个基于视图的工程，修改头文件：

//  //  CloViewController.h  //  LocationMapTest  //  //  Created by Cloay on 12-6-18.  //  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.  //    #import   #import   #import "CloMKAnnotation.h"  @interface CloViewController : UIViewController{      MKMapView *cloMapView;      MKPolyline *routeLine;  }    @property (nonatomic, strong)  NSMutableArray *locations;  @end

修改实现代码，在.m中添加如下代码：

//  //  CloViewController.m  //  LocationMapTest  //  //  Created by Cloay on 12-6-18.  //  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.  //    #import "CloViewController.h"    @interface CloViewController ()    @end    @implementation CloViewController  @synthesize locations;    - (void)viewDidLoad  {      [super viewDidLoad];   // Do any additional setup after loading the view, typically from a nib.      cloMapView = [[MKMapView alloc] initWithFrame:[self.view bounds]];      [cloMapView setMapType:MKMapTypeHybrid];  //设置地图类型 地图/卫星/两者结合      [cloMapView setShowsUserLocation:YES];      //显示当前位置      [cloMapView setDelegate:self];            CLLocationManager *locationManager = [[CLLocationManager alloc] init];      //设置CLLocationManager实例委托和精度      [locationManager setDelegate:self];      [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];      //设置距离筛选器，表示至少移动100米才通知委托更新      [locationManager setDistanceFilter:100.f];      //启动更新请求  //    [locationManager startUpdatingLocation];            locations = [[NSMutableArray alloc] init];      float latitude = 39.8127;    //维度      float longitude = 116.2967;  //经度      for (int i = 0; i < 10; i++) {                    [locations addObject:[NSString stringWithFormat:@"%f,%f", latitude + 0.01*i, longitude + 0.01*i]];  //            NSLog(@"locations:%i",locations.count);      }            //地图初始      CLLocationCoordinate2D coords;      coords.latitude = 39.9127;      coords.longitude = 116.3967;      float zoomlevel = 0.22;      MKCoordinateRegion region = MKCoordinateRegionMake(coords, MKCoordinateSpanMake(zoomlevel, zoomlevel));      [cloMapView setRegion:[cloMapView regionThatFits:region] animated:YES];            [cloMapView addOverlay:[self makePolylineWithLocations:locations]];      [self.view addSubview:cloMapView];        }    - (void)viewDidUnload  {      [super viewDidUnload];      // Release any retained subviews of the main view.      cloMapView = nil;  }    - (void)dealloc{      [cloMapView release];      [super dealloc];  }    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  {      return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);  }      //显示菜单选项  - (void)showActionSheet :(id)sender{   UIActionSheet * actionSheet = [[UIActionSheet alloc] initWithTitle:nil                    delegate:self                 cancelButtonTitle:@"取消"              destructiveButtonTitle:@"添加足迹"                otherButtonTitles:@"分享",@"详细",@"删除", nil];      [actionSheet setDelegate:self];   [actionSheet showInView:self.view];   [actionSheet release];  }    //根据坐标点生成线路  - (MKPolyline *)makePolylineWithLocations:(NSMutableArray *)newLocations{      MKMapPoint *pointArray = malloc(sizeof(CLLocationCoordinate2D)* newLocations.count);      for(int i = 0; i < newLocations.count; i++)        {            // break the string down even further to latitude and longitude fields.             NSString* currentPointString = [newLocations objectAtIndex:i];            NSArray* latLonArr = [currentPointString componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@","]];          CLLocationDegrees latitude  = [[latLonArr objectAtIndex:0] doubleValue];            //        NSLog(@"latitude-> %f", latitude);          CLLocationDegrees longitude = [[latLonArr objectAtIndex:1] doubleValue];            CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(latitude, longitude);            //        NSLog(@"point-> %f", point.x);                    if (i == 0 || i == locations.count - 1) {//这里只添加起点和终点作为测试              CloMKAnnotation *ann = [[CloMKAnnotation alloc] init];     [ann setCoordinate:coordinate];              [ann setTitle:[NSString stringWithFormat:@"纬度:%f", latitude]];              [ann setSubtitle:[NSString stringWithFormat:@"经度:%f", longitude]];     [cloMapView addAnnotation:ann];          }          pointArray[i] = MKMapPointForCoordinate(coordinate);      }              routeLine = [MKPolyline polylineWithPoints:pointArray count:newLocations.count];      free(pointArray);      return routeLine;  }  #pragma mark-  #pragma CLLocationManager delegate method  //位置变化后会调用  - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{      //可在此处更新用户位置信息  //    cloMapView.userLocation      NSLog(@"oldLocation:%@", [oldLocation description]);      NSLog(@"newLocation:%@", [newLocation description]);      NSLog(@"distance:%@", [newLocation distanceFromLocation:oldLocation]);      //位置变化添加新位置点      [locations addObject:[NSString stringWithFormat:@"%f,%f", newLocation.coordinate.latitude, newLocation.coordinate.longitude]];      //删除进线路，更新新轨迹      [cloMapView removeOverlay:routeLine];      [cloMapView addOverlay:[self makePolylineWithLocations:locations]];    }    #pragma MKMapView delegate method  //添加坐标点大头针  - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id)annotation{      if (![annotation isKindOfClass:[CloMKAnnotation class]]) {          return nil;      }      static NSString *identifier = @"Annotation";      MKPinAnnotationView *pinAnnotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];      if (pinAnnotationView == nil) {          pinAnnotationView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier] autorelease];      }      pinAnnotationView.animatesDrop = YES;      pinAnnotationView.canShowCallout = YES;      pinAnnotationView.draggable = YES;      UIButton *detailBtn = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];      [detailBtn addTarget:self action:@selector(showActionSheet:) forControlEvents:UIControlEventTouchUpInside];      pinAnnotationView.rightCalloutAccessoryView = detailBtn;            return pinAnnotationView;  }    - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view didChangeDragState:(MKAnnotationViewDragState)newState fromOldState:(MKAnnotationViewDragState)oldState{        }    //画线  - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id)overlay{      NSLog(@"return overLayView...");      if ([overlay isKindOfClass:[MKPolyline class]]) {          MKPolylineView *routeLineView = [[[MKPolylineView alloc] initWithPolyline:routeLine] autorelease];          routeLineView.strokeColor = [UIColor blueColor];          routeLineView.lineWidth = 3;          return routeLineView;      }      return nil;  }    @end

这里主要是为了测试，初始时 locations坐标点自定义的，实际中是根据用户的位置动态生成的一系列坐标点。具体可在

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation

函数中实现，如上代码。

另外用户的实时位置可用

cloMapView.userLocation = newLocation进行设置，然后显示在地图上。

效果图如下：

 

转自：http://blog.csdn.net/shang_515/article/details/7676456