iOS8 定位

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>

@interface ANNViewController : UIViewController <CLLocationManagerDelegate>

@end

#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];
    //ios 8后
    //在Info.plist中加入两个缺省没有的字段
    //NSLocationAlwaysUsageDescription
    //NSLocationWhenInUseUsageDescription
    
    //建立CLLocationManager对象
    self.locationManager = [[CLLocationManager alloc] init];
    //设置代理为本身
    if ([CLLocationManager locationServicesEnabled]) {
        NSLog( @"Starting CLLocationManager" );
        self.locationManager.delegate = self;
        [self.locationManager requestAlwaysAuthorization];

        self.locationManager.distanceFilter = 200;
        self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
        [self.locationManager startUpdatingLocation];
    } else {
        NSLog( @"Cannot Starting CLLocationManager" );
        /*self.locationManager.delegate = self;
         self.locationManager.distanceFilter = 200;
         locationManager.desiredAccuracy = kCLLocationAccuracyBest;
         [self.locationManager startUpdatingLocation];*/
    }
}
- (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];
             
             //将得到的全部信息显示到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没法经过locality得到，只能经过获取省份的方法来得到（若是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，直到选择中止更新，由于咱们只须要得到一次经纬度便可，因此获取以后就中止更新
//    [manager stopUpdatingLocation];
}

-(void)locationManager:(CLLocationManager *)manager didFailWithError:(nonnull NSError *)error
{
    NSLog(@"%@",error);
}
- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end