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(CLLocationCoord

补充：移动开发 , IOS ,