IOS 使用IOS6苹果地图

IOS应用程序中使用Map Kit API开发地图应用程序。其核心是MKMapView类的使用。我们可以设置地图显示方式，控制地图，可以在地图上添加标注。

1.显示地图

在Map Kit API中显示地图的师徒是MKMapView,他的委托协议是MKMapViewDelegate。Map Kit API使用需要导入MapKit框架。

下面通过一个实例介绍一下Map Kit API的使用，实例如图所示，再输入查询地点关键字文本框中输入关键字，单击查询，先进行地理信息编码查询，查询获得地标后在地图上标注出来。

首先添加框架MapKit.framework，设置视图，在ViewController.h代码如下：

 1 #import <UIKit/UIKit.h>
 2 #import <MapKit/MapKit.h>
 3 #import "HBMapLocation.h"
 4 
 5 @interface HBMaPViewController : UIViewController<MKMapViewDelegate>
 6 @property (weak, nonatomic) IBOutlet UITextField *txtQueryKey;
 7 @property (weak, nonatomic) IBOutlet MKMapView *mapView;
 8 - (IBAction)gecodeQuery:(id)sender;
 9 - (IBAction)getMyPlace:(id)sender;
10 
11 @property (nonatomic ,readwrite)CLLocationCoordinate2D coordinate;
12 @end

其中头文件中的“HBMapLocation.h”是我们定义的描述地图标注点类，稍后再说。在ViewController.m中代码如下：

  1 - (void)viewDidLoad
  2 {
  3     [super viewDidLoad];
  4     // Do any additional setup after loading the view.
  5     self.mapView.mapType = MKMapTypeStandard;
  6     self.mapView.delegate = self;
  7     self.mapView.showsUserLocation = YES;
  8     [_mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
  9 }

其中viewDidLoad方法中设置地图的类型，他的类型有3种：

(1)MKMapTypeStandard标注地图类型

(2)MKMapTypeSatellite 卫星地图类型

(3)MKMapTypeHybrid混合地图类型。

2.添加标注

如果要实现在地图视图上添加标注点，需要两个步骤：第一步时触发添加动作；第二步是实现地图委托方法mapView:viewForAnnotation：完成添加标注。

2.1 触发添加动作

通过查询按钮触发添加标注代码如下：

 1 - (IBAction)gecodeQuery:(id)sender {
 2     
 3     if(_txtQueryKey.text == nil || [_txtQueryKey.text length] ==0 )
 4     {
 5         return;
 6     }
 7     
 8     CLGeocoder *geocoder = [[CLGeocoder alloc]init];
 9     [geocoder geocodeAddressString:_txtQueryKey.text completionHandler:^(NSArray *placemarks, NSError *error) {
10         int i=[placemarks count];
11         NSLog(@"查询记录数:%i",i);
12         
13         if([placemarks count]>0)
14         {
15             [_mapView removeAnnotations:_mapView.annotations];
16         }
17         
18         for (int i=0; i<[placemarks count]; i++) {
19             CLPlacemark *placemark = placemarks[i];
20             
21             //关闭键盘
22             [self.txtQueryKey resignFirstResponder];
23             
24             //调整地图位置和缩放比例
25             MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(placemark.location.coordinate, 3000, 3000);
26             [_mapView setRegion:viewRegion animated:YES];
27             
28             HBMapLocation *annotation = [[HBMapLocation alloc]init];
29             annotation.streetAddress=placemark.thoroughfare;
30             annotation.city=placemark.locality;
31             annotation.state=placemark.administrativeArea;
32             annotation.zip=placemark.postalCode;
33             annotation.coordinate=placemark.location.coordinate;
34             
35             [_mapView addAnnotation:annotation];
36         }
37     }];
38     
39 }

2. 实现地图委托方法mapView:viewForAnnotation: 完成添加标注

 1 - (IBAction)getMyPlace:(id)sender {
 2     self.mapView.centerCoordinate = self.coordinate;
 3     MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(self.coordinate, 3000, 3000);
 4     [_mapView setRegion:viewRegion animated:YES];
 5     
 6 }
 7 
 8 -(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
 9 {
10     MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[_mapView dequeueReusableAnnotationViewWithIdentifier:@"PIN_ANNOTATION"];
11     
12     if(annotationView == nil)
13     {
14         annotationView = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"PIN_ANNOTATION"];
15     }
16     
17     annotationView.pinColor = MKPinAnnotationColorPurple;
18     annotationView.animatesDrop = YES;
19     annotationView.canShowCallout = YES;
20     
21     return annotationView;
22 }

3.跟踪用户位置变化

MapKit 提供个跟踪用户位置和方向变化的API,可以不用自己编写定位服务代码。开启地图的showUserLocation属性，并设置方法setUserTrackingMode:就可以了，其代码写在viewDidLoad中。

然后还需要实现地图视图委托方法mapView:didUpdateUserLocation: 代码如下

1 -(void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
2 {
3     self.coordinate=userLocation.location.coordinate;
4     self.mapView.centerCoordinate = userLocation.location.coordinate;
5      MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(userLocation.location.coordinate, 3000, 3000);
6     [_mapView setRegion:viewRegion animated:YES];
7 }

其中自定义标注类HBMapLocation.h代码如下

 1 #import <Foundation/Foundation.h>
 2 #import <MapKit/MapKit.h>
 3 
 4 @interface HBMapLocation : NSObject<MKAnnotation>
 5 
 6 
 7 //街道信息属性
 8 @property (nonatomic,copy)NSString *streetAddress;
 9 //城市信息属性
10 @property (nonatomic,copy)NSString *city;
11 //州，省，市信息
12 @property (nonatomic,copy)NSString *state;
13 //邮编
14 @property (nonatomic,copy)NSString *zip;
15 //地理坐标
16 @property (nonatomic ,readwrite)CLLocationCoordinate2D coordinate;
17 
18 @end

HBMapLocation.m代码如下：

 1 @implementation HBMapLocation
 2 
 3 -(NSString *)title
 4 {
 5     return @"要查找的位置";
 6 }
 7 
 8 -(NSString *)subtitle
 9 {
10     NSMutableString *ret = [NSMutableString new];
11     if(_state)
12     {
13         [ret appendString:_state];
14     }
15     if(_city)
16     {
17         [ret appendString:_city];
18     }
19     if(_city && _state)
20     {
21         [ret appendString:@", "];
22     }
23     if(_streetAddress && (_city || _state || _zip))
24     {
25         [ret appendString:@"?"];
26     }
27     if(_streetAddress)
28     {
29         [ret appendString:_streetAddress];
30     }
31     if(_zip)
32     {
33         [ret appendFormat:@", %@",_zip];
34     }
35     return ret;
36 }
37 
38 @end

运行如下：