如果应用程序正在运行且CLLocationManagerDelegate类是前台(即可见),则didEnterRegions触发,我同时获得NSLog以及AlertView.但是,当应用程序在后台时,或者基本上,如果屏幕显示除委托类之外的任何内容,我什么也得不到.
我已经在plist中的"Required background modes"下设置了"App registers for location updates",虽然我不确定是否有必要.
这是我认为相关的代码,虽然我可能是错的(并乐意添加更多).我应该注意viewDidLoad中的所有内容都包含在if中,检查区域监视是否可用并启用.
- (void)viewDidLoad
{
NSLog(@"MapViewController - viewDidLoad");
self.locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters;
self.locationManager.distanceFilter = kCLLocationAccuracyNearestTenMeters;
self.locationManager.delegate = self;
[self.locationManager startMonitoringSignificantLocationChanges];
}
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region
{
NSLog(@"MapViewController - didEnterRegion");
NSLog(@"MVC - didEnterRegion - region.radius = %f", region.radius);
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"entered region..." message:@"You have Entered the Location." delegate:nil cancelButtonTitle:@"OK" otherButtonTitles: nil];
alert.tag = 2;
[alert show];
}
这是我在AppDelegate.m中获取受监控区域列表的位置:
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// other code
NSLog(@"LISTING ALL REGIONS MONITORED"); …