如何删除cllocation的缓存？ [英] How to remove cache of cllocation?

问题描述

我正在开发一款支持位置感知应用的iPhone应用。
Currentlly应用程序正常工作，除了以前位置的缓存。
我第一次启动应用程序位置管理器获取当前位置，然后根据当前位置显示附近的东西。

但是从下一次使用它以前获取的位置，直到我重新启动手机，它将获取相同的位置。所以到目前为止，我很清楚位置管理器缓存该位置。

所以我的问题是如何删除此缓存并强制位置管理器获取新位置
谢谢

解决方案

实际上我认为你不能：由你（在你的 CLLocationManagerDelegate 实例中）来过滤这个位置您收到的是基于其时间戳（以确保您处理的职位是最近的职位，而不是缓存职位）。

 
  
 
 
 
  - （void）locationManager：（CLLocationManager *）manager didUpdateToLocation：（CLLocation *）newLocation fromLocation：（CLLocation *）oldLocation {
 NSDate * eventDate = newLocation.timestamp; 
 NSTimeInterval howRecent = [eventDate timeIntervalSinceNow]; 
 //活动最新且准确吗？ 
 if（abs（howRecent）< SECS_OLD_MAX）{
 //使用它！ 
} 
 .... 
 .... 
 
 
 
  
 

I am developing an iPhone app which is a location aware app . Currentlly the app is working fine except the caching of previous location . The first time I start the application location manager fetches the current location and then I display nearby things based on the current location .

But from the next it uses previously fetched location and until I restart the phone it will fetch the same location . So up to this point I am clear that the location manager caches the location .

So my question is how to remove this cache and force the location manager to fetch a new location thanks

解决方案

Actually I don't think you can : it's up to you (in your CLLocationManagerDelegate instance) to filter the position you receive based on its timestamp (to ensure that the position you work on is a recent one, not a cached one).

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation{
    NSDate *eventDate = newLocation.timestamp; 
    NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
    //Is the event recent and accurate enough ?
    if (abs(howRecent) < SECS_OLD_MAX) {
        //WORK WITH IT !
    }
....
....

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