定位获取位置及位置编码-反编码
我们的应用程序,可以通过添加Core Location框架所包含的类,获取设备的地图位置。
添加CoreLocation.framework框架,导入#import<CoreLocation/CoreLocation.h>。
使用地图服务时,会消耗更多地设备电量.因此,在获取到设备的位置后,应该停止定位来节省电量。
我们通过一个demo来展示内容与效果
// // HMTRootViewController.h // My-GPS-Map // // Created by hmt on 14-4-12. // Copyright (c) 2014年 胡明涛. All rights reserved. // #import <UIKit/UIKit.h> @interface HMTRootViewController : UIViewController <CLLocationManagerDelegate> @end // // HMTRootViewController.m // My-GPS-Map // // Created by hmt on 14-4-12. // Copyright (c) 2014年 胡明涛. All rights reserved. // #import "HMTRootViewController.h" #import <AddressBook/AddressBook.h> @interface HMTRootViewController (){ CLLocationManager * _locationManage; } @property (nonatomic,retain) CLLocationManager * locationManage; @end @implementation HMTRootViewController - (void)dealloc{ RELEASE_SAFELY(_locationManage); [super dealloc]; } - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. [self createGPSMap]; self.view.backgroundColor = [UIColor redColor]; } - (void)createGPSMap{ // 初始化位置服务 self.locationManage = [[CLLocationManager alloc]init]; // 要求CLLocationManager对象返回全部信息 _locationManage.distanceFilter = kCLDistanceFilterNone; // 设置定位精度 _locationManage.desiredAccuracy = kCLLocationAccuracyBest; // 设置代理 _locationManage.delegate = self; // 开始定位 [_locationManage startUpdatingLocation]; [_locationManage release]; } - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{ CLLocation * newLocation = [locations lastObject]; // 停止实时定位 [_locationManage stopUpdatingLocation]; // 取得经纬度 CLLocationCoordinate2D coord2D = newLocation.coordinate; double latitude = coord2D.latitude; double longitude = coord2D.longitude; NSLog(@"纬度 = %f 经度 = %f",latitude,longitude); // 取得精度 CLLocationAccuracy horizontal = newLocation.horizontalAccuracy; CLLocationAccuracy vertical = newLocation.verticalAccuracy; NSLog(@"水平方 = %f 垂直方 = %f",horizontal,vertical); // 取得高度 CLLocationDistance altitude = newLocation.altitude; NSLog(@"%f",altitude); // 取得此时时刻 NSDate *timestamp = [newLocation timestamp]; // 实例化一个NSDateFormatter对象 NSDateFormatter* dateFormat = [[NSDateFormatter alloc] init]; // 设定时间格式 [dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss a"]; [dateFormat setAMSymbol:@"AM"]; // 显示中文, 改成"上午" [dateFormat setPMSymbol:@"PM"]; // 求出当天的时间字符串,当更改时间格式时,时间字符串也能随之改变 NSString *dateString = [dateFormat stringFromDate:timestamp]; NSLog(@"此时此刻时间 = %@",dateString); // -----------------------------------------位置反编码-------------------------------------------- CLGeocoder * geocoder = [[CLGeocoder alloc]init]; [geocoder reverseGeocodeLocation:newLocation completionHandler:^(NSArray *placemarks, NSError *error) { for (CLPlacemark * place in placemarks) { NSLog(@"name = %@",place.name); // 位置名 NSLog(@"thoroughfare = %@",place.thoroughfare); // 街道 NSLog(@"subAdministrativeArea = %@",place.subAdministrativeArea); // 子街道 NSLog(@"locality = %@",place.locality); // 市 NSLog(@"subLocality = %@",place.subLocality); // 区 NSLog(@"country = %@",place.country); // 国家 NSArray *allKeys = place.addressDictionary.allKeys; for (NSString *key in allKeys) { NSLog(@"key = %@, value = %@",key, place.addressDictionary[key]); } #pragma mark - 使用系统定义的字符串直接查询,记得导入AddressBook框架 NSLog(@"kABPersonAddressCityKey = %@", (NSString *)kABPersonAddressCityKey); NSLog(@"city = %@", place.addressDictionary[(NSString *)kABPersonAddressCityKey]); NSString *city = place.locality; if(city == nil) { city = place.addressDictionary[(NSString *)kABPersonAddressStateKey]; } } }]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end
// 判断输入的地址 if (self.locationTextField.text == nil || [self.locationTextField.text length] == 0) { return; } CLGeocoder *geocoder = [[CLGeocoder alloc] init]; /* -----------------------------------------位置编码-------------------------------------------- */ [geocoder geocodeAddressString:_locationTextField.text completionHandler:^(NSArray *placemarks, NSError *error) { for (CLPlacemark *placemark in placemarks) { CLLocationCoordinate2D coordinate = placemark.location.coordinate; NSString *strCoordinate = [NSString stringWithFormat:@"纬度 = %3.5f\n 经度 = %3.5f",coordinate.latitude,coordinate.longitude]; NSLog(@"%@",strCoordinate); NSDictionary *addressDictionary = placemark.addressDictionary; NSString *address = [addressDictionary objectForKey:(NSString *)kABPersonAddressStreetKey]; NSString *state = [addressDictionary objectForKey:(NSString *)kABPersonAddressStateKey]; NSString *city = [addressDictionary objectForKey:(NSString *)kABPersonAddressCityKey]; NSLog(@"街道 = %@\n 省 = %@\n 城市 = %@",address,state,city); } }];
地图的使用以及标注地图
使用CoreLocation框架获取了当前设备的位置,这一章介绍地图的使用。
首先,导入<MapKit.framework>框架:
#import <MapKit/MapKit.h>
main.h #import <UIKit/UIKit.h> #import <MapKit/MapKit.h> // 引用地图协议 @interface HMTMainViewController : UIViewController<MKMapViewDelegate> @end main.m // // HMTMainViewController.m // Map // // Created by HMT on 14-6-21. // Copyright (c) 2014年 humingtao. All rights reserved. // #import "HMTMainViewController.h" #import "HMTAnnotation.h" @interface HMTMainViewController () @property (nonatomic ,strong) MKMapView *mapView; @end @implementation HMTMainViewController - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self; } - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor redColor]; // Do any additional setup after loading the view. self.navigationItem.title = @"地图标注"; self.mapView = [[MKMapView alloc] initWithFrame:CGRectMake(0, 0, 320, 568)]; // 是否显示用户当前位置 self.mapView.showsUserLocation = YES; // 设置代理 self.mapView.delegate = self; // 地图显示类型 /** * MKMapTypeStandard = 0, // 标准地图 * MKMapTypeSatellite, // 卫星地图 * MKMapTypeHybrid // 混合地图 */ self.mapView.mapType = MKMapTypeStandard; // 经纬度 CLLocationCoordinate2D coord2D = {39.910650,116.47030}; // 显示范围,数值越大,范围就越大 MKCoordinateSpan span = {0.1,0.1}; // 显示区域 MKCoordinateRegion region = {coord2D,span}; // 给地图设置显示区域 [self.mapView setRegion:region animated:YES]; // 是否允许缩放 //self.mapView.zoomEnabled = NO; // 是否允许滚动 //self.mapView.scrollEnabled = NO; // 初始化自定义Annotation(可以设置多个) HMTAnnotation *annotation = [[HMTAnnotation alloc] initWithCGLocation:coord2D]; // 设置标题 annotation.title = @"自定义标注位置"; // 设置子标题 annotation.subtitle = @"子标题"; // 将标注添加到地图上(执行这步,就会执行下面的代理方法viewForAnnotation) [self.mapView addAnnotation:annotation]; [self.view addSubview:_mapView]; } // 返回标注视图(大头针视图) - (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id<MKAnnotation>)annotation{ /** * 是不是有点像自定义UITableViewCell一样 */ static NSString *identifier = @"annotation"; // 复用标注视图(MKPinAnnotationView是大头针视图,继承自MKAnnotation) MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[mapView dequeueReusableAnnotationViewWithIdentifier:identifier]; if (annotationView == nil) { annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:identifier]; } // 判断是否为自定义的标注视图 if ([annotation isKindOfClass:[HMTAnnotation class]]) { // 设置大头针圆圈颜色 annotationView.pinColor = MKPinAnnotationColorGreen; // 点击头针红色圆圈是否显示上面设置好的标题视图 annotationView.canShowCallout = YES; // 要自定义锚点图片,可考虑使用MKAnnotationView;MKPinAnnotationView只能是以大头针形式显示!!!! annotationView.image = [UIImage imageNamed:@"customImage"]; // 添加标题视图右边视图(还有左边视图,具体可自行查看API) UIButton *button = [UIButton buttonWithType:UIButtonTypeDetailDisclosure]; [button addTarget:self action:@selector(didClickAnnotationViewRightButtonAction:) forControlEvents:UIControlEventTouchUpInside]; annotationView.rightCalloutAccessoryView = button; // 是否以动画形式显示标注(从天而降) annotationView.animatesDrop = YES; annotationView.annotation = annotation; // 返回自定义的标注视图 return annotationView; }else{ // 当前设备位置的标注视图,返回nil,当前位置会创建一个默认的标注视图 return nil; } } - (void)didClickAnnotationViewRightButtonAction:(UIButton *)button{ NSLog(@"%d %s",__LINE__,__FUNCTION__); } // 更新当前位置调用 - (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation{ NSLog(@"%d %s",__LINE__,__FUNCTION__); } // 选中标注视图 - (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view{ NSLog(@"%d %s",__LINE__,__FUNCTION__); } // 地图的现实区域改变了调用 - (void)mapView:(MKMapView *)mapView regionDidChangeAnimated:(BOOL)animated{ NSLog(@"%d %s",__LINE__,__FUNCTION__); } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } @end
自定义MKAnnotationView
#import <Foundation/Foundation.h> #import <MapKit/MapKit.h> // 引入MKAnnotation协议,切记不能忘记!!!!!!!!! @interface HMTAnnotation : NSObject<MKAnnotation> @property (nonatomic,readonly) CLLocationCoordinate2D coordinate; // 坐标 @property (nonatomic,copy) NSString *title; // 位置名称 @property (nonatomic,copy) NSString *subtitle; // 位置子信息(可选) - (id)initWithCGLocation:(CLLocationCoordinate2D) coordinate; @end #import "HMTAnnotation.h" @implementation HMTAnnotation - (id)initWithCGLocation:(CLLocationCoordinate2D)coordinate{ if (self = [super init]) { _coordinate = coordinate; } return self; } @end
效果图:
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