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: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<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 = 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