iOS 获得当前经纬度和城市

1.引入CoreLocation.framework,#import <CoreLocation/CoreLocation.h>,添加委托CLLocationManagerDelegate


2.

{
    float Currentlat,Currentlon;
    CLLocationManager *locationManager;
    UILabel *cityLabel;
}

3.viewDidLoad里添加

if ([CLLocationManager locationServicesEnabled] == NO) {
        NSLog(@"没有GPS服务");   
        UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"警告" message:@"没有GPS服务" delegate:self cancelButtonTitle:@"取消" otherButtonTitles:nil, nil];
        [alertView show];   
    }else{
        CLLocationManager *locmanager = [[CLLocationManager alloc]init];//先定义一个cllocationmanager的实例
        locationManager=locmanager;
        [locationManager requestAlwaysAuthorization];//相对应info.plist中的NSLocationAlwaysUsageDescription键
        [locmanager setDelegate:self]; //设置代理为本身
        [locmanager setDesiredAccuracy:kCLLocationAccuracyBest];//设置精确度为最准确
        locmanager.distanceFilter = 1000.0f;
        [locationManager startUpdatingLocation];
    }

4.
//ios6.0以上
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
    CLLocation *newLocation = [locations lastObject];
    CLLocationCoordinate2D coor = newLocation.coordinate;
    Currentlat =  coor.latitude;
    Currentlon = coor.longitude;
    NSLog(@"当前维度ios7 %f 当前经度 %f",Currentlat,Currentlon);
    CLGeocoder * geoCoder = [[CLGeocoder alloc] init];
    [geoCoder reverseGeocodeLocation:newLocation completionHandler:^(NSArray *placemarks, NSError *error) { 
        for (CLPlacemark * placemark in placemarks) {
            NSDictionary *test = [placemark addressDictionary];
            //  Country(国家)  State(城市)  SubLocality(区)
            cityLabel.text=[test objectForKey:@"State"];
        }
    }];
    [manager stopUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager
       didFailWithError:(NSError *)error
{
    NSLog(@"定位失败");
    UIAlertView *alert=[[UIAlertView alloc]initWithTitle:@"提示" message:@"定位失败" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];
    [alert show];
}

5.

ios8必须注意：

iOS8对定位进行了一些修改，其中包括定位授权的方法，CLLocationManager增加了下面的两个方法：

（1）始终允许访问位置信息

- (void)requestAlwaysAuthorization;

（2）使用应用程序期间允许访问位置数据

- (void)requestWhenInUseAuthorization;

在运行开始更新前加下面这句

[locationManager requestAlwaysAuthorization];//相对应info.plist中的NSLocationAlwaysUsageDescription键

2、在Info.plist文件中添加如下配置：

（1）NSLocationAlwaysUsageDescription

（2）NSLocationWhenInUseUsageDescription

这两个键的值就是授权alert的描述，示例配置如下[勾选Show Raw Keys/Values后进行添加]：

额外附赠：

五、根据两点坐标计算两点之间的距离，此方法为苹果自带方法，亲测速度比高德API速度快很多，但是数据与高德API得到的不一样，准确度本人未能证实

//第一个坐标

CLLocation *current=[[CLLocation alloc] initWithLatitude:32.178722 longitude:119.508619];

//第二个坐标

CLLocation *before=[[CLLocation alloc] initWithLatitude:32.206340 longitude:119.425600];

// 计算距离

CLLocationDistance meters=[current distanceFromLocation:before];