iOS开发：通过经纬度获得城市、省份等信息
iOS系统自带定位，用CLLocationManager就可以轻松的实现定位的操作，获得的是一组经纬度，当然，也可以根据给出的经纬度获取相应的省份、城市、街道等信息，下面就看一个根据经纬度获得城市的demo：
因为获取经纬度需要CLLocationManager类，而这个类包含在CoreLocation框架中，获取城市信息需要mapKit框架，所以需要首先在工程中导入这两个框架：
导入框架的步骤：选择1.target――2.Build Phases――3.Link Binary With Libraries ――4.点击“+”号：如图所示步骤：
点击加号之后在搜索框里输入相应的框架，即可搜索到，如图所示：
下面就该写代码了，首先在视图控制器中导入：
#import <CoreLocation/CoreLocation.h> #import <MapKit/MapKit.h>
两个头文件，然后.m中的具体代码如下：
#import "ANNViewController.h"
@interface ANNViewController ()
@property (strong, nonatomic) IBOutlet UILabel *longitude;
@property (strong, nonatomic) IBOutlet UILabel *latitude;
@property (strong, nonatomic) IBOutlet UILabel *location;
@property (strong, nonatomic) CLLocationManager *locationManager;
@end
@implementation ANNViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor whiteColor];
//创建CLLocationManager对象
self.locationManager = [[CLLocationManager alloc] init];
//设置代理为自己
self.locationManager.delegate = self;
}
- (IBAction)locationButton:(UIButton *)sender {
[self.locationManager startUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
//将经度显示到label上
self.longitude.text = [NSString stringWithFormat:@"%lf", newLocation.coordinate.longitude];
//将纬度现实到label上
self.latitude.text = [NSString stringWithFormat:@"%lf", newLocation.coordinate.latitude];
// 获取当前所在的城市名
CLGeocoder *geocoder = [[CLGeocoder alloc] init];
//根据经纬度反向地理编译出地址信息
[geocoder reverseGeocodeLocation:newLocation completionHandler:^(NSArray *array, NSError *error)
{
if (array.count > 0)
{
CLPlacemark *placemark = [array objectAtIndex:0];
//将获得的所有信息显示到label上
self.location.text = placemark.name;
//获取城市
NSString *city = placemark.locality;
if (!city) {
//四大直辖市的城市信息无法通过locality获得，只能通过获取省份的方法来获得（如果city为空，则可知为直辖市）
city = placemark.administrativeArea;
}
NSLog(@"city = %@", city);
}
else if (error == nil && [array count] == 0)
{
NSLog(@"No results were returned.");
}
else if (error != nil)
{
NSLog(@"An error occurred = %@", error);
}
}];
//系统会一直更新数据，直到选择停止更新，因为我们只需要获得一次经纬度即可，所以获取之后就停止更新
[manager stopUpdatingLocation];
}
主要就是直辖市的城市获得需要拐个弯，iOS7添加了一个新的方法，代替了上面这个方法：
- (void)locationManager:(CLLocationManager *)manager
didUpdateLocations:(NSArray *)locations
{
NSLog(@"longitude = %f", ((CLLocation *)[locations
lastObject]).coordinate.longitude);
NSLog(@"latitude = %f", ((CLLocation *)[locations lastObject]).coordinate.latitude);
[manager stopUpdatingLocation];
}
后面的处理和上面的方法一样，大家可以看一下。
另外还有一些CLGeocoder的属性如下：
@property (nonatomic, readonly) NSDictionary *addressDictionary; // address dictionary properties @property (nonatomic, readonly) NSString *name; // eg. Apple Inc. @property (nonatomic, readonly) NSString *thoroughfare; // street address, eg. 1 Infinite Loop @property (nonatomic, readonly) NSString *subThoroughfare; // eg. 1 @property (nonatomic, readonly) NSString *locality; // city, eg. Cupertino @property (nonatomic, readonly) NSString *subLocality; // neighborhood, common name, eg. Mission District @property (nonatomic, readonly) NSString *administrativeArea; // state, eg. CA @property (nonatomic, readonly) NSString *subAdministrativeArea; // county, eg. Santa Clara @property (nonatomic, readonly) NSString *postalCode; // zip code, eg. 95014 @property (nonatomic, readonly) NSString *ISOcountryCode; // eg. US @property (nonatomic, readonly) NSString *country; // eg. United States @property (nonatomic, readonly) NSString *inlandWater; // eg. Lake Tahoe @property (nonatomic, readonly) NSString *ocean; // eg. Pacific Ocean @property (nonatomic, readonly) NSArray *areasOfInterest; // eg. Golden Gate Park
完整的工程如下：
附件下载地址：https://github.com/winann/TestLocation.git