iOS定位服务与地图开发(4)---显示地图

#import 

@interface YXCViewController @end

@implementation YXCViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    // 设置地图的类型
    self.mapView.mapType = MKMapTypeStandard;
    // 设置代理
    self.mapView.delegate = self;
}

#pragma  mark - MKMapViewDelegate代理方法
// 失败回调
- (void)mapViewDidFailLoadingMap:(MKMapView *)mapView withError:(NSError *)error
{
    NSLog(@"error : %@",error.localizedDescription);
}

@end

- (IBAction)geocodeQuery:(id)sender {
    
    // 从界面文本框获取查询地址字符串
    if (_txtQueryKey.text == nil || [_txtQueryKey.text length] == 0) {
        return ;
    }
    
    CLGeocoder *geocoder = [[CLGeocoder alloc] init];
    
    [geocoder geocodeAddressString:_txtQueryKey.text completionHandler:^(NSArray *placemarks, NSError *error) {
        
        NSLog(@"查询记录数:%i",[placemarks count]);
        
        if ([placemarks count] > 0) {
            // 移除目前地图上所有标注点【否则单击查询按钮，你会发现地图上的标注点越来越多】
            [self.mapView removeAnnotations:_mapView.annotations];
        }
        
        for (int i = 0; i <[placemarks count]; i++) {
            
            CLPlacemark *placemark = placemarks[i];
            // 关闭键盘
            [_txtQueryKey resignFirstResponder];
            
            // 调整地图位置和缩放比例
            MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(placemark.location.coordinate, 1000, 1000);
            [_mapView setRegion:viewRegion animated:YES];
            
            // 实例化自定义的实现了MKAnnotation协议的地图标注点类
            MapLocation *annoation = [[MapLocation alloc] init];
            annoation.streetAddress = placemark.thoroughfare;
            annoation.city = placemark.locality;
            annoation.state = placemark.administrativeArea;
            annoation.zip = placemark.postalCode;
            annoation.coordinate = placemark.location.coordinate;
            
            // 把标注点对象添加到地图上
            // 该方法一定会调用代理方法mapView: viewForAnnotation:
            [_mapView addAnnotation:annoation];
        }
    }];
}

// 委托方法，在地图视图添加标注的时候回调
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id)annotation
{
    // 获得地图标注对象
    MKPinAnnotationView *annoatiOnView= (MKPinAnnotationView *)[_mapView dequeueReusableAnnotationViewWithIdentifier:@"PIN_ANNOATION"];
    if (annoatiOnView== nil) {
        annoationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"PIN_ANNOATION"];
    }
    // 设置大头针标注视图的颜色为紫色
    annoationView.pinColor= MKPinAnnotationColorPurple;
    // 设置标注视图时候是否动画显示在地图上
    annoationView.animatesDrop = YES;
    // 在标注上可以显示一些附加信息，为YES情况下单击“大头针”时会出现一个气泡
    // 气泡中文字信息封装在MapLocation对象中
    annoationView.canShowCallout = YES;
    
    return annoationView;
}

#import 

@interface MapLocation : NSObject

// 地理坐标
@property (nonatomic , readwrite) CLLocationCoordinate2D coordinate;
// 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;

@end

@implementation MapLocation

- (NSString *)title
{
    return @"您的位置！";
}

- (NSString *)subtitle
{
    NSMutableString *ret = [[NSMutableString alloc] init];
    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;
    
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // 设置地图的类型
    self.mapView.mapType = MKMapTypeStandard;
    // 设置代理
    self.mapView.delegate = self;
    
    // 允许跟踪显示用户的位置信息
    self.mapView.showsUserLocation = YES;
    // 设置用户跟踪模式（有3种）
    [self.mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
}

// 实现地图视图的委托方法
// 该方法是在定位服务更新完成用户位置时回调
// 在该方法中重新调整地图的中心点为当前用户的中心点
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
    self.mapView.centerCoordinate = userLocation.location.coordinate;
}