iOS CoreLocation之区域监测

CoreLocation的区域监测,下图来自疯狂iOS讲义

1.引CoreLocation框架,导入头文件

#import <CoreLocation/CoreLocation.h>

2.添加定位管理为成员变量,添加延迟加载

@property (nonatomic,strong) CLLocationManager *locMgr;

/**
 *  懒加载
 */
- (CLLocationManager *)locMgr
{
    if (_locMgr == nil) {
        _locMgr = [[CLLocationManager alloc]init];
        _locMgr.delegate = self;
    }
    return _locMgr;
}

3.开启区域监测

- (void)viewDidLoad
{
    [super viewDidLoad];

    // 设置中心
    CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(39, 116);
    // 设置半径
    CLLocationDistance distance = 500;
    // 创建监测区域
    CLRegion *region = [[CLCircularRegion alloc]initWithCenter:coordinate radius:distance identifier:@"region"];
    
    // 开始区域检测
    [self.locMgr startMonitoringForRegion:region];
}

4.添加代理方法

#pragma mark -CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region
{
    NSLog(@"成功开启区域监测");
}

- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
    NSLog(@"你已进入监测区域");
}

- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region
{
    NSLog(@"你已经离开监测区域");
    
    // 关闭区域监测
    if ([region.identifier  isEqual: @"region"]) {
        [self.locMgr stopMonitoringForRegion:region];
    }

}