iOS学习之Map,定位，标记位置的使用

iOS上使用地图比Android要方便，只需要新建一个MKMapView,addSubView即可。这次要实现的效果如下：

有标注（大头针），定位，地图。

1、添加地图

1.1 新一个Single View app ，选择默认项，创建后，在ViewController.h 

 #import <UIKit/UIKit.h>
 #import <MapKit/MapKit.h>
 #import <CoreLocation/CoreLocation.h>

 @interface ViewController : UIViewController
 <MKMapViewDelegate, CLLocationManagerDelegate> {
     MKMapView *map;
     CLLocationManager *locationManager;
 }
 @end

1.2在ViewController.m中添加

 - (void)viewDidLoad
 {
     map = [[MKMapView alloc] initWithFrame:[self.view bounds]];
     map.showsUserLocation = YES;
     map.mapType = MKMapTypeSatellite;
     [self.view addSubview:map];


     [super viewDidLoad];
     // Do any additional setup after loading the view, typically from a nib.
 }

运行：

OMG,看到的是世界地图。怎么定位到指定的位置呢？比如定位回来伟大的祖国首都？

这里map.mapType =MKMapTypeSatellite;我用到是卫星地图，可以使用标准的地图，

map.mapType =MKMapTypeStandard;

注意，如果此时你编译有错误，请拉到博客最后查看 ：5、 遇到的问题

2、定位到指定经纬度

 CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(39.915352,116.397105);

     float zoomLevel = 0.02;
     MKCoordinateRegion region = MKCoordinateRegionMake(coords, MKCoordinateSpanMake(zoomLevel, zoomLevel));
     [map setRegion:[map regionThatFits:region] animated:YES];

这样，就我们就定位的了故宫了。

3、添加标注大头针

3.1 新建一个标注类：CustomAnnotation

按Command+N，继承NSObject。在CustomAnnotation.h 和CustomAnnotation.m文件添加如下代码：

 #import <Foundation/Foundation.h>
 #import <MapKit/MapKit.h>

 @interface CustomAnnotation : NSObject
 <MKAnnotation>
 {
     CLLocationCoordinate2D coordinate;
     NSString *title;
     NSString *subtitle;
 }
 -(id) initWithCoordinate:(CLLocationCoordinate2D) coords;

 @property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
 @property (nonatomic, retain) NSString *title;
 @property (nonatomic, retain) NSString *subtitle;

 @end

 #import "CustomAnnotation.h"

 @implementation CustomAnnotation
 @synthesize coordinate, title, subtitle;

 -(id) initWithCoordinate:(CLLocationCoordinate2D) coords
 {
     if (self = [super init]) {
         coordinate = coords;
     }
     return self;
 }
 @end

3.1 使用大头针，

新建个方法添加大头针的

 -(void)createAnnotationWithCoords:(CLLocationCoordinate2D) coords {
     CustomAnnotation *annotation = [[CustomAnnotation alloc] initWithCoordinate:
                                     coords];
     annotation.title = @"标题";
     annotation.subtitle = @"子标题";
     [map addAnnotation:annotation];
 }

调用

 CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(39.915352,116.397105);

     float zoomLevel = 0.02;
     MKCoordinateRegion region = MKCoordinateRegionMake(coords, MKCoordinateSpanMake(zoomLevel, zoomLevel));
     [map setRegion:[map regionThatFits:region] animated:YES];


     [self createAnnotationWithCoords:coords];

这样我们就把大头针定位在故宫了

4、定位到当前位置并获取当前经纬度

前面我们已经添加了locationManager，现在在DidViewLoad里直接调用

 locationManager = [[CLLocationManager alloc] init];
     locationManager.delegate = self;
     [locationManager startUpdatingLocation];

实现协议方法收到定位成功后的经纬度

 - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
     [locationManager stopUpdatingLocation];

     NSString *strLat = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.latitude];
     NSString *strLng = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.longitude];
     NSLog(@"Lat: %@  Lng: %@", strLat, strLng);

 }

 - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
     NSLog(@"locError:%@", error);

 }

运行，允许获取当前位置，打印log

 2012-06-28 23:58:32.237 MapDemo[8202:11603] Lat: 39.9011  Lng: 116.3000

如果不允许：打印出错误日志

 2012-06-28 23:25:03.109 MapDemo[7531:11603] locError:Error Domain=kCLErrorDomain Code=1 "The operation couldn’t be completed. (kCLErrorDomain error 1.)"

定位后，移动到当前位置：

 - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
     [locationManager stopUpdatingLocation];

     NSString *strLat = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.latitude];
     NSString *strLng = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.longitude];
     NSLog(@"Lat: %@  Lng: %@", strLat, strLng);

     CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(newLocation.coordinate.latitude,newLocation.coordinate.longitude);
     float zoomLevel = 0.02;
     MKCoordinateRegion region = MKCoordinateRegionMake(coords,MKCoordinateSpanMake(zoomLevel, zoomLevel));
     [map setRegion:[map regionThatFits:region] animated:YES];
 }

定位到了当前位置。

5、会遇到的问题：

运行是发现了编译错误：

Undefined symbols for architecture i386:

  "_CLLocationCoordinate2DMake", referenced from:

      -[ViewController viewDidLoad] in ViewController.o

      -[ViewController locationManager:didUpdateToLocation:fromLocation:] in ViewController.o

  "_OBJC_CLASS_$_MKMapView", referenced from:

      objc-class-ref in ViewController.o

  "_OBJC_CLASS_$_CLLocationManager", referenced from:

      objc-class-ref in ViewController.o

ld: symbol(s) not found for architecture i386

clang: error: linker command failed with exit code 1 (use -v to see invocation)

这是为什么呢？没有添加对应的FrameWork。我使用的是4.3.2版本的XCode，添加方法如下：

选择项目，TARGETS ,点加号，添加两个framework

就好了。

如何发送IOS模拟器经纬度？

5.0以上的模拟器才能用这个功能，打开模拟：

这样就能发送模拟的当前位置了。

例子代码：http://download.csdn.net/detail/totogo2010/4400001点击打开链接

https://github.com/schelling/YcDemo/tree/master/MapDemo

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