GPS定位

#import <CoreLocation/CoreLocation.h>//头文件

#define PATH @"http://api.map.baidu.com/geocoder?output=json&location=%f,%f&key=dc40f705157725fc98f1fee6a15b6e60"

@interface RootViewController ()<CLLocationManagerDelegate>
{
    //lbs 定位管理
    CLLocationManager *_manager;
}
@property (nonatomic,strong)CLLocationManager *manager;
@end

@implementation RootViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"开始定位" style:UIBarButtonItemStylePlain target:self action:@selector(begineLocation)];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"停止定位" style:UIBarButtonItemStylePlain target:self action:@selector(endLocation)];
    
    //创建管理器
    [self initLocationManager];
}

/*
 kCLLocationAccuracyBestForNavigation //导航时候用的精度
 kCLLocationAccuracyBest;//比较高的精度
 kCLLocationAccuracyNearestTenMeters; 10m内
 kCLLocationAccuracyHundredMeters;100m
 kCLLocationAccuracyKilometer;1000m
 kCLLocationAccuracyThreeKilometers; 3000m
 */
- (void)initLocationManager {
    if (!self.manager) {
        //实例化一个管理对象
        self.manager = [[CLLocationManager alloc] init];
        //设置精度 精度越高越耗电
        self.manager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
        //精度大小 1m
        self.manager.distanceFilter = 1;
        
        /*
         iOS之后 需要设置配置文件
         
         1.在info.plist中添加  Privacy - Location Usage Description  ,  NSLocationAlwaysUsageDescription
         2.在代码中  [_manager requestAlwaysAuthorization];
         //ios8特有，申请用户授权使用地理位置信息
        
         */
        CGFloat version = [[[UIDevice currentDevice] systemVersion] floatValue];
        //判断版本
        if (version >= 8.0) {
            //申请用户授权使用地理位置信息
            [self.manager requestAlwaysAuthorization];
        }
        //如果要 获取定位的位置 那么需要设置代理
        self.manager.delegate = self;
        
    }
}

- (void)begineLocation {
    //是否支持定位服务
    if ([CLLocationManager locationServicesEnabled]) {
        //开始定位
        [self.manager startUpdatingLocation];
    }else{
        NSLog(@"没有gps");
    }
}
//停止定位
- (void)endLocation {
    [self.manager stopUpdatingLocation];
}

#pragma mark - CLLocationManagerDelegate协议
//当定位开始时 位置发生改变的时候 会一直调用
//会把定位的位置 放入 locations数组中
//这个数组实际上只有一个元素
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
    NSLog(@"定位位置");
    if (locations.count) {
        //数组中只有一个元素
        CLLocation *location = [locations lastObject];
        //CLLocationCoordinate2D是一个结构体 内部存放的是经纬度
        CLLocationCoordinate2D coordinate = location.coordinate;
        NSLog(@"longitude:%f",coordinate.longitude);
        NSLog(@"latitude:%f",coordinate.latitude);
        
#if 1
        //官方自带的地理反编码
        CLGeocoder *geoCoder = [[CLGeocoder alloc] init];
        //地理逆向编码  地理反编码 （把经纬度转化为真正的地址位置）
        [geoCoder reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error) {
            //回调这个block
            //解析好之后会放在 placemarks 数组中(实际上就一个元素)
            for (CLPlacemark *mark in placemarks) {
                NSLog(@"name->%@",mark.name);
                NSLog(@"country:%@",mark.country);
                for (NSString *key in mark.addressDictionary) {
                    NSLog(@"%@",mark.addressDictionary[key]);
                }
            }
        }];
        
#else
        //异步下载数据 用百度的地理反编码
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
            NSString *url = [NSString stringWithFormat:PATH,34.77274892, 113.67591140];
            NSData *data = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
            //下载完成
            NSDictionary *dict = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];
            NSDictionary *result = dict[@"result"];
            NSLog(@"addr:%@",result[@"formatted_address"]);
            
        });
#endif
        
    }
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    NSLog(@"定位失败");
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}