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：

 

1 #import <UIKit/UIKit.h>  

2 #import <MapKit/MapKit.h>  

3 #import "CloMKAnnotation.h"  

4 @interface CloViewController : UIViewController<CLLocationManagerDelegate, MKMapViewDelegate, UIActionSheetDelegate>{  

5     MKMapView *cloMapView;  

6     MKPolyline *routeLine;  

7 }  

8   

9 @property (nonatomic, strong)  NSMutableArray *locations;  

修改实现代码，在.m中添加如下代码：

  1 #import "CloViewController.h"  

  2   

  3 @interface CloViewController ()  

  4   

  5 @end  

  6   

  7 @implementation CloViewController  

  8 @synthesize locations;  

  9   

 10 - (void)viewDidLoad  

 11 {  

 12     [super viewDidLoad];  

 13     // Do any additional setup after loading the view, typically from a nib.  

 14     cloMapView = [[MKMapView alloc] initWithFrame:[self.view bounds]];  

 15     [cloMapView setMapType:MKMapTypeHybrid];  //设置地图类型 地图/卫星/两者结合  

 16     [cloMapView setShowsUserLocation:YES];      //显示当前位置  

 17     [cloMapView setDelegate:self];  

 18       

 19     CLLocationManager *locationManager = [[CLLocationManager alloc] init];  

 20     //设置CLLocationManager实例委托和精度  

 21     [locationManager setDelegate:self];  

 22     [locationManager setDesiredAccuracy:kCLLocationAccuracyBest];  

 23     //设置距离筛选器，表示至少移动100米才通知委托更新  

 24     [locationManager setDistanceFilter:100.f];  

 25     //启动更新请求  

 26 //    [locationManager startUpdatingLocation];  

 27       

 28     locations = [[NSMutableArray alloc] init];  

 29     float latitude = 39.8127;    //维度  

 30     float longitude = 116.2967;  //经度  

 31     for (int i = 0; i < 10; i++) {  

 32           

 33         [locations addObject:[NSString stringWithFormat:@"%f,%f", latitude + 0.01*i, longitude + 0.01*i]];  

 34 //            NSLog(@"locations:%i",locations.count);  

 35     }  

 36       

 37     //地图初始  

 38     CLLocationCoordinate2D coords;  

 39     coords.latitude = 39.9127;  

 40     coords.longitude = 116.3967;  

 41     float zoomlevel = 0.22;  

 42     MKCoordinateRegion region = MKCoordinateRegionMake(coords, MKCoordinateSpanMake(zoomlevel, zoomlevel));  

 43     [cloMapView setRegion:[cloMapView regionThatFits:region] animated:YES];  

 44       

 45     [cloMapView addOverlay:[self makePolylineWithLocations:locations]];  

 46     [self.view addSubview:cloMapView];  

 47       

 48 }  

 49   

 50 - (void)viewDidUnload  

 51 {  

 52     [super viewDidUnload];  

 53     // Release any retained subviews of the main view.  

 54     cloMapView = nil;  

 55 }  

 56   

 57 - (void)dealloc{  

 58     [cloMapView release];  

 59     [super dealloc];  

 60 }  

 61   

 62 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation  

 63 {  

 64     return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);  

 65 }  

 66   

 67   

 68 //显示菜单选项  

 69 - (void)showActionSheet :(id)sender{  

 70     UIActionSheet * actionSheet = [[UIActionSheet alloc] initWithTitle:nil   

 71                                                               delegate:self   

 72                                                      cancelButtonTitle:@"取消"  

 73                                                 destructiveButtonTitle:@"添加足迹"  

 74                                                      otherButtonTitles:@"分享",@"详细",@"删除", nil];  

 75     [actionSheet setDelegate:self];  

 76     [actionSheet showInView:self.view];  

 77     [actionSheet release];  

 78 }  

 79   

 80 //根据坐标点生成线路  

 81 - (MKPolyline *)makePolylineWithLocations:(NSMutableArray *)newLocations{  

 82     MKMapPoint *pointArray = malloc(sizeof(CLLocationCoordinate2D)* newLocations.count);  

 83     for(int i = 0; i < newLocations.count; i++)    

 84     {    

 85         // break the string down even further to latitude and longitude fields.     

 86         NSString* currentPointString = [newLocations objectAtIndex:i];    

 87         NSArray* latLonArr = [currentPointString componentsSeparatedByCharactersInSet:[NSCharacterSet characterSetWithCharactersInString:@","]];  

 88         CLLocationDegrees latitude  = [[latLonArr objectAtIndex:0] doubleValue];    

 89         //        NSLog(@"latitude-> %f", latitude);  

 90         CLLocationDegrees longitude = [[latLonArr objectAtIndex:1] doubleValue];    

 91         CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(latitude, longitude);    

 92         //        NSLog(@"point-> %f", point.x);  

 93           

 94         if (i == 0 || i == locations.count - 1) {//这里只添加起点和终点作为测试  

 95             CloMKAnnotation *ann = [[CloMKAnnotation alloc] init];  

 96             [ann setCoordinate:coordinate];  

 97             [ann setTitle:[NSString stringWithFormat:@"纬度:%f", latitude]];  

 98             [ann setSubtitle:[NSString stringWithFormat:@"经度:%f", longitude]];  

 99             [cloMapView addAnnotation:ann];  

100         }  

101         pointArray[i] = MKMapPointForCoordinate(coordinate);  

102     }    

103       

104     routeLine = [MKPolyline polylineWithPoints:pointArray count:newLocations.count];  

105     free(pointArray);  

106     return routeLine;  

107 }  

108 #pragma mark-  

109 #pragma CLLocationManager delegate method  

110 //位置变化后会调用  

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

112     //可在此处更新用户位置信息  

113 //    cloMapView.userLocation  

114     NSLog(@"oldLocation:%@", [oldLocation description]);  

115     NSLog(@"newLocation:%@", [newLocation description]);  

116     NSLog(@"distance:%@", [newLocation distanceFromLocation:oldLocation]);  

117     //位置变化添加新位置点  

118     [locations addObject:[NSString stringWithFormat:@"%f,%f", newLocation.coordinate.latitude, newLocation.coordinate.longitude]];  

119     //删除进线路，更新新轨迹  

120     [cloMapView removeOverlay:routeLine];  

121     [cloMapView addOverlay:[self makePolylineWithLocations:locations]];  

122   

123 }  

124   

125 #pragma MKMapView delegate method  

126 //添加坐标点大头针  

127 - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{  

128     if (![annotation isKindOfClass:[CloMKAnnotation class]]) {  

129         return nil;  

130     }  

131     static NSString *identifier = @"Annotation";  

132     MKPinAnnotationView *pinAnnotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier];  

133     if (pinAnnotationView == nil) {  

134         pinAnnotationView = [[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier] autorelease];  

135     }  

136     pinAnnotationView.animatesDrop = YES;  

137     pinAnnotationView.canShowCallout = YES;  

138     pinAnnotationView.draggable = YES;  

139     UIButton *detailBtn = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];  

140     [detailBtn addTarget:self action:@selector(showActionSheet:) forControlEvents:UIControlEventTouchUpInside];  

141     pinAnnotationView.rightCalloutAccessoryView = detailBtn;  

142       

143     return pinAnnotationView;  

144 }  

145   

146 - (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view didChangeDragState:(MKAnnotationViewDragState)newState fromOldState:(MKAnnotationViewDragState)oldState{  

147       

148 }  

149   

150 //画线  

151 - (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id<MKOverlay>)overlay{  

152     NSLog(@"return overLayView...");  

153     if ([overlay isKindOfClass:[MKPolyline class]]) {  

154         MKPolylineView *routeLineView = [[[MKPolylineView alloc] initWithPolyline:routeLine] autorelease];  

155         routeLineView.strokeColor = [UIColor blueColor];  

156         routeLineView.lineWidth = 3;  

157         return routeLineView;  

158     }  

159     return nil;  

160 }  

161   

162 @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

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

另外用户的实时位置可用

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

运行效果