iOS版：针对特定地理区域位置警告用户（纬度，经度）

Question

我试图实现一个Geo location为用户的功能，我静态设置latitude和longitude信息时，如果用户的应用程序启动在那个区域内，我正在显示一条消息，“你已经到达办公室”，否则“你正在外出”。为了达到这个目的，我已经实现了下面的代码，我尝试了通过步骤和车辆四处移动，但是在两种情况下，它总是显示“您已经到达办公室”，但是我离该位置2公里！我认为问题在于CLLocationManager代表中地理数据的比较。

- (void) startUpdateUserLocation 
{ 
    if(!locationManager) 
     locationManager = [[CLLocationManager alloc] init]; 

    locationManager.delegate = self; 
    locationManager.distanceFilter = kCLDistanceFilterNone; 
    locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation; 

// [locationManager startUpdatingLocation]; 

    CLLocationCoordinate2D coord = CLLocationCoordinate2DMake(latitude, longitude); 

    CLRegion *region = [[CLRegion alloc] initCircularRegionWithCenter:coord radius:kCLDistanceFilterNone identifier:@"identifier"]; 
    [locationManager startMonitoringForRegion:region]; 
} 

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 

    latitude = 23.076289; 
    longitude = 72.508129; 
} 

- (void) viewDidAppear:(BOOL)animated 
{ 
    [super viewDidAppear:animated]; 

    MKCoordinateRegion region; 
    region.center = mapView.userLocation.coordinate; 
    region.span = MKCoordinateSpanMake(0.25, 0.25); 
    region = [mapView regionThatFits:region]; 
    [mapView setRegion:region animated:YES]; 

    lblCurrentCoords.text = [NSString stringWithFormat:@"lat %f lon %f",mapView.userLocation.coordinate.latitude,mapView.userLocation.coordinate.longitude]; 

    [self startUpdateUserLocation]; 
} 

- (void)locationManager:(CLLocationManager *)manager 
didEnterRegion:(CLRegion *)region __OSX_AVAILABLE_STARTING(__MAC_10_7,__IPHONE_4_0) 
{ 
    [listOfPoints addObject:manager.location]; 
    [tablePoints reloadData]; 

    /* 
    * locationManager:didEnterRegion: 
    * 
    * Discussion: 
    * Invoked when the user enters a monitored region. This callback will be invoked for every allocated 
    * CLLocationManager instance with a non-nil delegate that implements this method. 
    */ 

    lblLocationStatus.text = @"You're in office area!..."; 
} 

- (void)locationManager:(CLLocationManager *)manager 
didExitRegion:(CLRegion *)region __OSX_AVAILABLE_STARTING(__MAC_10_7,__IPHONE_4_0) 
{ 
    /* 
    * locationManager:didExitRegion: 
    * 
    * Discussion: 
    * Invoked when the user exits a monitored region. This callback will be invoked for every allocated 
    * CLLocationManager instance with a non-nil delegate that implements this method. 
    */ 

    lblLocationStatus.text = @"You're going out from office area!..."; 
} 

- (void)locationManager:(CLLocationManager *)manager 
didStartMonitoringForRegion:(CLRegion *)region __OSX_AVAILABLE_STARTING(__MAC_TBD,__IPHONE_5_0) 
{ 
    /* 
    * locationManager:didStartMonitoringForRegion: 
    * 
    * Discussion: 
    * Invoked when a monitoring for a region started successfully. 
    */ 

    lblLocationStatus.text = @"Start monitoring..."; 
} 

- (void)locationManager:(CLLocationManager *)manager 
monitoringDidFailForRegion:(CLRegion *)region 
withError:(NSError *)error __OSX_AVAILABLE_STARTING(__MAC_10_7,__IPHONE_4_0) 
{ 
    /* 
    * locationManager:monitoringDidFailForRegion:withError: 
    * 
    * Discussion: 
    * Invoked when a region monitoring error has occurred. Error types are defined in "CLError.h". 
    */ 

    lblLocationStatus.text = @"Stop monitoring..."; 
} 

我正在努力完成以下工作！

1. 如果用户进入地理位置，他应该是“alert”。 ---如何匹配位置？
2. 如果在该地理位置内移动，则代码应该监视此活动！ ---需要设置所需的精度属性？
3. 我希望我的代码不断地检查用户地理位置，我该怎么做？ ---需要拨打NSTimer的功能？

我发现很多关于这个问题都问过同样的问题，但没有人找到答案！有人请指导我是否朝着正确的方向前进，因为这段代码没有显示出来！ :)

Answer 1

这听起来像你应该使用区域监视，而不是告诉你什么时候用户进入或退出一个圆形区域。与startMonitoringForRegion:设置并执行CLLocationManagerDelegate方法

– locationManager:didEnterRegion: 
– locationManager:didExitRegion: 
– locationManager:monitoringDidFailForRegion:withError: 
– locationManager:didStartMonitoringForRegion: 

如果您有任何不好的位置数据来麻烦，请检查CLLocation在locationManager:didUpdateLocations:或locationManager:didUpdateToLocation:fromLocation:岁。如果它超过60秒，请不要使用它。