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.

}