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
时间： 2024-11-18 22:06:34