IOS开发中绘制地图线路

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：

 #import <UIKit/UIKit.h>
 #import <MapKit/MapKit.h>
 #import "CloMKAnnotation.h"
 @interface CloViewController : UIViewController<CLLocationManagerDelegate, MKMapViewDelegate, UIActionSheetDelegate>{
     MKMapView *cloMapView;
     MKPolyline *routeLine;
 }  

 @property (nonatomic, strong)  NSMutableArray *locations;  

修改实现代码，在.m中添加如下代码：

 #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:.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 = ; i < ; 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 = ; 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:] doubleValue];
         //        NSLog(@"latitude-> %f", latitude);
         CLLocationDegrees longitude = [[latLonArr objectAtIndex:] doubleValue];
         CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(latitude, longitude);
         //        NSLog(@"point-> %f", point.x);  

         if (i ==  || i == locations.count - ) {//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<MKAnnotation>)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<MKOverlay>)overlay{
     NSLog(@"return overLayView...");
     if ([overlay isKindOfClass:[MKPolyline class]]) {
         MKPolylineView *routeLineView = [[[MKPolylineView alloc] initWithPolyline:routeLine] autorelease];
         routeLineView.strokeColor = [UIColor blueColor];
         routeLineView.lineWidth = ;
         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。具体可在下面方法中实现

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

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。

运行效果