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

1 CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(39.915352,116.397105);
2     
3     float zoomLevel = 0.02;
4     MKCoordinateRegion region = MKCoordinateRegionMake(coords, MKCoordinateSpanMake(zoomLevel, zoomLevel));
5     [map setRegion:[map regionThatFits:region] animated:YES];
6

1.2在ViewController.m中添加

 1 - (void)viewDidLoad
 2 {
 3     map = [[MKMapView alloc] initWithFrame:[self.view bounds]];
 4     map.showsUserLocation = YES;
 5     map.mapType = MKMapTypeSatellite;
 6     [self.view addSubview:map];
 7 
 8 
 9     [super viewDidLoad];
10     // Do any additional setup after loading the view, typically from a nib.
11 }

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

1 CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(39.915352,116.397105);
2     
3     float zoomLevel = 0.02;
4     MKCoordinateRegion region = MKCoordinateRegionMake(coords, MKCoordinateSpanMake(zoomLevel, zoomLevel));
5     [map setRegion:[map regionThatFits:region] animated:YES];
6

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：

 1 #import <Foundation/Foundation.h>
 2 #import <MapKit/MapKit.h>
 3 
 4 @interface CustomAnnotation : NSObject 
 5 <MKAnnotation>
 6 {
 7     CLLocationCoordinate2D coordinate;
 8     NSString *title;
 9     NSString *subtitle;
10 }
11 -(id) initWithCoordinate:(CLLocationCoordinate2D) coords;
12 
13 @property (nonatomic, readonly) CLLocationCoordinate2D coordinate;
14 @property (nonatomic, retain) NSString *title;
15 @property (nonatomic, retain) NSString *subtitle;
16 
17 @end

 1 #import "CustomAnnotation.h"
 2 
 3 @implementation CustomAnnotation
 4 @synthesize coordinate, title, subtitle;
 5 
 6 -(id) initWithCoordinate:(CLLocationCoordinate2D) coords
 7 {
 8     if (self = [super init]) {
 9         coordinate = coords;
10     }
11     return self;
12 }
13 @end

3.1 使用大头针，

新建个方法添加大头针的

1 -(void)createAnnotationWithCoords:(CLLocationCoordinate2D) coords {
2     CustomAnnotation *annotation = [[CustomAnnotation alloc] initWithCoordinate: 
3                                     coords];
4     annotation.title = @"标题";
5     annotation.subtitle = @"子标题";
6     [map addAnnotation:annotation];
7 }

调用

1 CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(39.915352,116.397105);
2     
3     float zoomLevel = 0.02;
4     MKCoordinateRegion region = MKCoordinateRegionMake(coords, MKCoordinateSpanMake(zoomLevel, zoomLevel));
5     [map setRegion:[map regionThatFits:region] animated:YES];
6 
7     
8     [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

1 locationManager = [[CLLocationManager alloc] init];

2 locationManager.delegate = self;

3 [locationManager startUpdatingLocation];

实现协议方法收到定位成功后的经纬度

 1 - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
 2     [locationManager stopUpdatingLocation];
 3     
 4     NSString *strLat = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.latitude];
 5     NSString *strLng = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.longitude];
 6     NSLog(@"Lat: %@  Lng: %@", strLat, strLng);
 7 
 8 }
 9 
10 - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
11     NSLog(@"locError:%@", error);
12 
13 }

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：

 1 - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
 2     [locationManager stopUpdatingLocation];
 3     
 4     NSString *strLat = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.latitude];
 5     NSString *strLng = [NSString stringWithFormat:@"%.4f",newLocation.coordinate.longitude];
 6     NSLog(@"Lat: %@  Lng: %@", strLat, strLng);
 7     
 8     CLLocationCoordinate2D coords = CLLocationCoordinate2DMake(newLocation.coordinate.latitude,newLocation.coordinate.longitude);
 9     float zoomLevel = 0.02;
10     MKCoordinateRegion region = MKCoordinateRegionMake(coords,MKCoordinateSpanMake(zoomLevel, zoomLevel));
11     [map setRegion:[map regionThatFits:region] animated:YES];
12 }