在我的应用程序（部署目标 5.1）中，我使用 CoreLocation 设置提醒功能，它基本上会在设备更新其当前位置时搜索附近的项目（附加位置）。
此功能在现阶段工作不是很稳定，有时无论设备处于活动，挂起和终止状态，它都根本不起作用。我意识到委托方法locationManager:didUpdateToLocation:fromLocation:没有被调用。
有没有人可以为我指出一个方向，让这件事正常工作？
这是我对 CLLocationManager 的设置
sharedLocationManager = [[CLLocationManager alloc]init];
[ESLocationManager defaultManager].delegate = someDelegateClassInstance;
[[ESLocationManager defaultManager] setDesiredAccuracy:kCLLocationAccuracyHundredMeters];
[[ESLocationManager defaultManager] startMonitoringSignificantLocationChanges];
以及委托回调的实现
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
// If it's a relatively recent event, turn off updates to save power
NSDate* eventDate = newLocation.timestamp;
NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
if (abs(howRecent) < 20.0) {
// If the event is recent,find nearby items.
NSLog(@"latitude %+.6f, longitude %+.6f\n",
newLocation.coordinate.latitude,
newLocation.coordinate.longitude);
//reload nearby list
NSArray *nearbyItems = [self nearbyItemsForLocation:newLocation];
if (nearbyItems && nearbyItems.count ) {
UIApplicationState appState = [[UIApplication sharedApplication] applicationState];
if (appState != UIApplicationStateActive) {
[[UIApplication sharedApplication] presentLocalNotificationNow:[self localNotificationForItems:nearbyItems]];
}
}
}
}