iOS定位服务Core Location使用详解

骑猪看日落 2022-08-12 16:13 291阅读 0赞

声明：iOS开发小白程序员一枚,正在新手上路级别,行文中如有错误,还望各位批评指正,谢谢^^

效果图如下：

![SouthEast][]

实现代码如下：

#import <UIKit/UIKit.h>
    #import <CoreLocation/CoreLocation.h>
    
    @interface LocationViewController : UIViewController<CLLocationManagerDelegate>
    
    @property (strong,nonatomic)CLLocationManager *locationManager;
    
    @end

#import "LocationViewController.h"
    
    @implementation LocationViewController
    
    - (void)viewDidLoad
    {
        [super viewDidLoad];
        // Do any additional setup after loading the view.
        
        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        button.frame = CGRectMake(0, 100, 320, 30);
        [button setTitle:@"开始定位" forState:UIControlStateNormal];
        [button addTarget:self action:@selector(buttonClicked:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:button];
        
        UILabel *label1 = [[UILabel alloc] initWithFrame:CGRectMake(0, 200, 160, 30)];
        label1.tag = 101;
        [self.view addSubview:label1];
        
        UILabel *label2 = [[UILabel alloc] initWithFrame:CGRectMake(160, 200, 160, 30)];
        label2.tag = 102;
        [self.view addSubview:label2];
    }
    
    - (void)buttonClicked:(UIButton *)sender
    {
        //使用iOS自带定位服务,需要导入CoreLocation.framework库,同时导入#import <CoreLocation/CoreLocation.h>
        
        //初始化位置服务
        CLLocationManager *locationManager = [[CLLocationManager alloc] init];
        
        //设置位置变化多少米调用一次代理方法(不是一直在调用,而是有了多少米距离的变化才调用)
        [locationManager setDistanceFilter:1.0f];
        
        /**
         设置定位精度,精度越高越费电
         kCLLocationAccuracyBestForNavigation -- 最高精度,需要连接电源时可用
         kCLLocationAccuracyBest -- 最高精度
         kCLLocationAccuracyNearestTenMeters -- 10米范围内
         kCLLocationAccuracyHundredMeters -- 100米范围内
         kCLLocationAccuracyKilometer -- 1000米范围内
         kCLLocationAccuracyThreeKilometers -- 3000米范围内
         */
        [locationManager setDesiredAccuracy:kCLLocationAccuracyNearestTenMeters];
        
        //设置代理
        locationManager.delegate = self;
        
        //开始定位
        [locationManager startUpdatingLocation];
        
        //在ARC下必须使用个属性存起来,否则会被释放掉,导致“程序要使用您当前的位置”提示框闪一下便消失,无法点击确定
        self.locationManager = locationManager;
    }
    
    #pragma mark - CLLocationManagerDelegate
    //定位成功调用的代理协议,此协议是不断调用的
    -(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
    {
        //创建经纬度结构体对象,其中newLocation为现在位置,oldLocation为上次位置
        CLLocationCoordinate2D coord2D = newLocation.coordinate;
        
        UILabel *label1 = (UILabel *)[self.view viewWithTag:101];
        label1.text = [NSString stringWithFormat:@"经度：%f",coord2D.longitude];
        
        UILabel *label2 = (UILabel *)[self.view viewWithTag:102];
        label2.text = [NSString stringWithFormat:@"纬度：%f",coord2D.latitude];
        
        NSLog(@"经度：%f--纬度：%f",coord2D.longitude,coord2D.latitude);
        
        //一般使用定位1次即可,所以在使用之后将定位服务关闭以节省电量
        [self.locationManager stopUpdatingLocation];
    }
    //定位失败调用的代理协议
    - (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
    {
        NSLog(@"定位出错");
    }
    
    - (void)didReceiveMemoryWarning
    {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }
    
    @end

demo下载地址 [点击这里下载demo][demo]

[SouthEast]: /images/20220810/7503ffe564094009bb753e0da8cffa70.png
[demo]: http://download.csdn.net/detail/wenxiangjiang/7984481