iphone开发之绘制地图线路

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：

[cpp]   
//  CloViewController.h  
//  LocationMapTest  
//  
//  Created by Cloay on 12-6-18.  
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.  
//  
 
#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; 
@end 
//
//  CloViewController.h
//  LocationMapTest
//
//  Created by Cloay on 12-6-18.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#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;
@end

修改实现代码，在.m中添加如下代码：

[cpp]    
//  CloViewController.m  
//  LocationMapTest  
//  
//  Created by Cloay on 12-6-18.  
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.  
//  
 
#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 
//
//  CloViewController.m
//  LocationMapTest
//
//  Created by Cloay on 12-6-18.
//  Copyright (c) 2012年 __MyCompanyName__. All rights reserved.
//

#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

[cpp]  - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation 
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation函数中实现，如上代码。

另外用户的实时位置可用

[cpp]  cloMapView.userLocation = newLocation进行设置，然后显示在地图上。 
cloMapView.userLocation = newLocation进行设置，然后显示在地图上。
效果图如下：

 
作者：Shang_515