iOS定位功能

1.实现定位功能需要导入系统库MapKit.framework

2.在iPhone手机上默认是禁止手机定位的，所以，要询问系统是否开启手机定位功能。

为了开启手机定位功能，还需在info.plist中添加开启定位描述。如图，

3.功能代码如下：

//
//  ViewController.m
//  MapLocationDemo
//
//  Created by apple on 15/12/3.
//  Copyright © 2015年 hoondraw. All rights reserved.
//

#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>
#import "MapViewController.h"

@interface ViewController () <CLLocationManagerDelegate>

/** 定位管理类*/
@property (strong, nonatomic) CLLocationManager *mgr;

/** 地理编码对象*/
@property (strong, nonatomic) CLGeocoder *geocoder;

@property (weak, nonatomic) IBOutlet UILabel *latLabel;

@property (weak, nonatomic) IBOutlet UILabel *longLabel;

@property (weak, nonatomic) IBOutlet UILabel *geocoderLabel;

/** 当前定位信息*/
@property (strong, nonatomic) CLLocation *currentLocation;

@end

@implementation ViewController

- (CLLocationManager *)mgr {
    if (!_mgr) {
        _mgr = [[CLLocationManager alloc] init];
    }
    return _mgr;
}

- (CLGeocoder *)geocoder {
    if (!_geocoder) {
        _geocoder = [CLGeocoder new];
    }
    return _geocoder;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    self.mgr.delegate = self;
    
    if ([[UIDevice currentDevice].systemVersion doubleValue]> 8.0) {
        //只在前台定位
        [self.mgr requestWhenInUseAuthorization];
    } else {
        NSLog(@"iOS7");
        //直接开始定位
        [self.mgr startUpdatingLocation];
    }
}

#pragma mark - 定位协议方法
- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
    if (status == kCLAuthorizationStatusAuthorizedWhenInUse) {
        //定位的设置参数
        self.mgr.desiredAccuracy = kCLLocationAccuracyBest;
        self.mgr.distanceFilter = kCLHeadingFilterNone;
        [self.mgr startUpdatingLocation];
    } else {
        //不允许定位
    }
    
}

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations {
    CLLocation *location = [locations lastObject];
    self.latLabel.text = [NSString stringWithFormat:@"经度:%lf", location.coordinate.latitude];
    self.longLabel.text = [NSString stringWithFormat:@"纬度:%lf", location.coordinate.longitude];
    
    //获取当前的location
    self.currentLocation = location;
    
    [self.mgr stopUpdatingLocation];
}
/** 地理编码*/
- (IBAction)clickGecoder:(id)sender {
    NSString *name = @"广州市天河区天河珠江新城";
    //从服务器获取name对应的经纬度(请求)
    [self.geocoder geocodeAddressString:name completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        if (!error) {
            //地理编码成功
            for (CLPlacemark *placemark in placemarks) {
                self.latLabel.text = [NSString stringWithFormat:@"纬度:%lf",placemark.location.coordinate.latitude];
                self.longLabel.text = [NSString stringWithFormat:@"经度:%lf",placemark.location.coordinate.longitude];
                self.geocoderLabel.text = [NSString stringWithFormat:@"地址信息:%@",placemark.addressDictionary];
            }
        }
    }];
}


/** 反地理编码*/
- (IBAction)clickGeoDecoder:(id)sender {
    CLLocation *location = [[CLLocation alloc] initWithLatitude:self.currentLocation.coordinate.latitude longitude:self.currentLocation.coordinate.longitude];
    
    [self.geocoder reverseGeocodeLocation:location completionHandler:^(NSArray<CLPlacemark *> * _Nullable placemarks, NSError * _Nullable error) {
        if (!error) {
            //反地理编码成功
            for (CLPlacemark *placemark in placemarks) {
                self.latLabel.text = [NSString stringWithFormat:@"纬度:%lf",placemark.location.coordinate.latitude];
                self.longLabel.text = [NSString stringWithFormat:@"经度:%lf",placemark.location.coordinate.longitude];
                self.geocoderLabel.text = [NSString stringWithFormat:@"地址信息:%@",placemark.addressDictionary];
            }
        }
    }];
}

- (IBAction)gotoMapView:(id)sender {
    MapViewController *vc = [[MapViewController alloc] init];
    [self presentViewController:vc animated:YES completion:nil];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

其中，gotoMapView是跳转到地图控制器的方法。

代码如下：

//
//  MapViewController.m
//  MapLocationDemo
//
//  Created by apple on 15/12/3.
//  Copyright © 2015年 hoondraw. All rights reserved.
//

#import "MapViewController.h"
#import <MapKit/MapKit.h>

@interface MapViewController () <MKMapViewDelegate>

@property (weak, nonatomic) IBOutlet MKMapView *mapView;

@property (strong, nonatomic) CLLocationManager *mgr;

@end

@implementation MapViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.mgr = [[CLLocationManager alloc] init];
    [self.mgr requestWhenInUseAuthorization];
    //设置和地图相关的属性
    self.mapView.delegate = self;
    //设置地图的旋转属性
    self.mapView.rotateEnabled = YES;
    //使用地图视图开始定位
    self.mapView.userTrackingMode = MKUserTrackingModeFollow;
    
    
}

#pragma mark - MKMapViewDelegate
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation {
    //地图显示的区域
    //设置地图的中心
    CLLocationCoordinate2D center = userLocation.location.coordinate;
    //设置跨度
    MKCoordinateSpan span = MKCoordinateSpanMake(5, 5);
    MKCoordinateRegion region = MKCoordinateRegionMake(center, span);
    [self.mapView setRegion:region animated:YES];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}


@end

这样就可以跳转到地图中显示当前地理位置。