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：

 #import <UIKit/UIKit.h>
 #import <MapKit/MapKit.h>
 #import "HBMapLocation.h"

 @interface HBMaPViewController : UIViewController<MKMapViewDelegate>
 @property (weak, nonatomic) IBOutlet UITextField *txtQueryKey;
 @property (weak, nonatomic) IBOutlet MKMapView *mapView;
 - (IBAction)gecodeQuery:(id)sender;
 - (IBAction)getMyPlace:(id)sender;

 @property (nonatomic ,readwrite)CLLocationCoordinate2D coordinate;
 @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：

 - (void)viewDidLoad
 {
     [super viewDidLoad];
     // Do any additional setup after loading the view.
     self.mapView.mapType = MKMapTypeStandard;
     self.mapView.delegate = self;
     self.mapView.showsUserLocation = YES;
     [_mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
 }

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：

 - (IBAction)gecodeQuery:(id)sender {

     if(_txtQueryKey.text == nil || [_txtQueryKey.text length] == )
     {
         return;
     }

     CLGeocoder *geocoder = [[CLGeocoder alloc]init];
     [geocoder geocodeAddressString:_txtQueryKey.text completionHandler:^(NSArray *placemarks, NSError *error) {
         int i=[placemarks count];
         NSLog(@"查询记录数:%i",i);

         if([placemarks count]>)
         {
             [_mapView removeAnnotations:_mapView.annotations];
         }

         for (int i=; i<[placemarks count]; i++) {
             CLPlacemark *placemark = placemarks[i];

             //关闭键盘
             [self.txtQueryKey resignFirstResponder];

             //调整地图位置和缩放比例
             MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(placemark.location.coordinate, , );
             [_mapView setRegion:viewRegion animated:YES];

             HBMapLocation *annotation = [[HBMapLocation alloc]init];
             annotation.streetAddress=placemark.thoroughfare;
             annotation.city=placemark.locality;
             annotation.state=placemark.administrativeArea;
             annotation.zip=placemark.postalCode;
             annotation.coordinate=placemark.location.coordinate;

             [_mapView addAnnotation:annotation];
         }
     }];

 }

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

 - (IBAction)getMyPlace:(id)sender {
     self.mapView.centerCoordinate = self.coordinate;
     MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(self.coordinate, , );
     [_mapView setRegion:viewRegion animated:YES];

 }

 -(MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation
 {
     MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[_mapView dequeueReusableAnnotationViewWithIdentifier:@"PIN_ANNOTATION"];

     if(annotationView == nil)
     {
         annotationView = [[MKPinAnnotationView alloc]initWithAnnotation:annotation reuseIdentifier:@"PIN_ANNOTATION"];
     }

     annotationView.pinColor = MKPinAnnotationColorPurple;
     annotationView.animatesDrop = YES;
     annotationView.canShowCallout = YES;

     return annotationView;
 }

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

 -(void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
 {
     self.coordinate=userLocation.location.coordinate;
     self.mapView.centerCoordinate = userLocation.location.coordinate;
      MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(userLocation.location.coordinate, , );
     [_mapView setRegion:viewRegion animated:YES];
 }

其中自定义标注类HBMapLocation.h代码如下

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

 @interface HBMapLocation : NSObject<MKAnnotation>

 //街道信息属性
 @property (nonatomic,copy)NSString *streetAddress;
 //城市信息属性
 @property (nonatomic,copy)NSString *city;
 //州，省，市信息
 @property (nonatomic,copy)NSString *state;
 //邮编
 @property (nonatomic,copy)NSString *zip;
 //地理坐标
 @property (nonatomic ,readwrite)CLLocationCoordinate2D coordinate;

 @end

HBMapLocation.m代码如下：

 @implementation HBMapLocation

 -(NSString *)title
 {
     return @"要查找的位置";
 }

 -(NSString *)subtitle
 {
     NSMutableString *ret = [NSMutableString new];
     if(_state)
     {
         [ret appendString:_state];
     }
     if(_city)
     {
         [ret appendString:_city];
     }
     if(_city && _state)
     {
         [ret appendString:@", "];
     }
     if(_streetAddress && (_city || _state || _zip))
     {
         [ret appendString:@"?"];
     }
     if(_streetAddress)
     {
         [ret appendString:_streetAddress];
     }
     if(_zip)
     {
         [ret appendFormat:@", %@",_zip];
     }
     return ret;
 }

 @end

运行如下：