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] ==0 )
    {
        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]>0)
        {
            [_mapView removeAnnotations:_mapView.annotations];
        }
        
        for (int i=0; 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, 3000, 3000);
            [_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, 3000, 3000);
    [_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, 3000, 3000);
    [_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：