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