iphone - StartUpdatingLocation 与重大更改位置服务

Question

我有关于显着变化位置服务的问题。

Apple 文档说“无论您使用标准定位服务还是重大更改定位服务来获取定位事件，您接收这些事件的方式都是相同的。”

但是在“显着变化的位置服务”的情况下，我无法获得任何回调我得到了“标准位置服务”的情况请让我知道是否有人有任何意见？

Answer 1

startUpdatingLocation 在第一次调用时更新位置，然后在距离过滤器值超过时更新位置。

但是 startMonitoringSignificantLocationChanges 位置发生重大变化时。

请查看CLLocationManager了解详情。

startUpdatingLocation

Starts the generation of updates that report the user’s current location.

- (void)startUpdatingLocation Discussion

This method returns immediately. Calling this method causes the location manager to obtain an initial location fix (which may take several seconds) and notify your delegate by calling its locationManager:didUpdateLocations: method. (In iOS 5 and earlier, the location manager calls the locationManager:didUpdateToLocation:fromLocation: method instead.) After that, the receiver generates update events primarily when the value in the distanceFilter property is exceeded. Updates may be delivered in other situations though. For example, the receiver may send another notification if the hardware gathers a more accurate location reading.

Calling this method several times in succession does not automatically result in new events being generated. Calling stopUpdatingLocation in between, however, does cause a new initial event to be sent the next time you call this method.

If you start this service and your application is suspended, the system stops the delivery of events until your application starts running again (either in the foreground or background). If your application is terminated, the delivery of new location events stops altogether. Therefore, if your application needs to receive location events while in the background, it must include the UIBackgroundModes key (with the location value) in its Info.plist file.

In addition to your delegate object implementing the locationManager:didUpdateLocations: method, it should also implement the locationManager:didFailWithError: method to respond to potential errors.

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startMonitoringSignificantLocationChanges

Starts the generation of updates based on significant location changes.

- (void)startMonitoringSignificantLocationChanges Discussion

This method initiates the delivery of location events asynchronously, returning shortly after you call it. Location events are delivered to your delegate’s locationManager:didUpdateLocations: method. The first event to be delivered is usually the most recently cached location event (if any) but may be a newer event in some circumstances. Obtaining a current location fix may take several additional seconds, so be sure to check the timestamps on the location events in your delegate method.

After returning a current location fix, the receiver generates update events only when a significant change in the user’s location is detected. For example, it might generate a new event when the device becomes associated with a different cell tower. It does not rely on the value in the distanceFilter property to generate events. Calling this method several times in succession does not automatically result in new events being generated. Calling stopMonitoringSignificantLocationChanges in between, however, does cause a new initial event to be sent the next time you call this method.

If you start this service and your application is subsequently terminated, the system automatically relaunches the application into the background if a new event arrives. In such a case, the options dictionary passed to the locationManager:didUpdateLocations: method of your application delegate contains the key UIApplicationLaunchOptionsLocationKey to indicate that your application was launched because of a location event. Upon relaunch, you must still configure a location manager object and call this method to continue receiving location events. When you restart location services, the current event is delivered to your delegate immediately. In addition, the location property of your location manager object is populated with the most recent location object even before you start location services.

In addition to your delegate object implementing the locationManager:didUpdateLocations: method, it should also implement the locationManager:didFailWithError: method to respond to potential errors.

Note: Apps can expect a notification as soon as the device moves 500 meters or more from its previous notification. It should not expect notifications more frequently than once every five minutes. If the device is able to retrieve data from the network, the location manager is much more likely to deliver notifications in a timely manner.