地理围栏

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//配置位置管理器
-(void)managerLocation{
    if (!self.locationManager) {
        self.locationManager = [[CLLocationManager alloc] init];
    }

    //兼容8.0以前的版本
    if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
        //授权状态没有询问用户
        if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined) {
            [self.locationManager requestAlwaysAuthorization];
        }
    }

    //GPS硬件打开
    if (![CLLocationManager locationServicesEnabled]) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"" message:@"PGS 未打开！" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil , nil];
        [alert show];
    }

    self.locationManager.delegate = self;
    //设置精确度
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    //设置距离的过滤
    self.locationManager.distanceFilter = 15.f;

}

## 开始监测

- (IBAction)begin:(id)sender {
    //构造监听区域
    CLRegion *region = [[CLCircularRegion alloc] initWithCenter:CLLocationCoordinate2DMake(34.77, 113.76887056) radius:1000.f identifier:@"first"];
    [self.locationManager startMonitoringForRegion:region];

    //开始位置监听
    [self.locationManager startUpdatingLocation];

    //添加一个圆形的覆盖层
    MKCircle *circle = [MKCircle circleWithCenterCoordinate:CLLocationCoordinate2DMake(34.77, 113.76887056) radius:1000.f];
    [self.mapView addOverlay:circle];

}

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