如何在iPhone上查找城市的长和经度？

问题描述

我试图在iPhone上找到一个城市的长和经度。假设用户正在搜索伦敦，我会调用一些函数来检索伦敦的长和经度。我在网上看过，发现你可以使用谷歌API，但必须有苹果功能来处理这个问题吗？

我已经穿过了MKReverseGeocoder，长和拉特，并告诉你你附近的城市。例如

  //反向地理编码用户位置
 
 geocoder = [[[MKReverseGeocoder alloc] initWithCoordinate： mapView.userLocation.location.coordinate] autorelease]; 
  

如果它可以逆转这个过程，那么肯定有某种形式的MKGeocoder类？

解决方案

为什么必须有？因为没有。

您可以使用多种网络服务（例如Google），或者您可以下载地名数据库，例如并将其导入到您的应用中。最好将它导入到SQL数据库中，然后您可以从您的应用程序中进行搜索。

I am trying to find the long and lat of a city on the iphone. Say the user is searching for London, I would call some function that would retrieve the long and lat of London. I have looked on the web and found you can use a Google API but there must be an Apple function somewhere to handle this?

I have come accross the MKReverseGeocoder which takes the long and lat and tells you what city you are near. e.g.

// reverse geocode the user location

geocoder = [[[MKReverseGeocoder alloc] initWithCoordinate:mapView.userLocation.location.coordinate] autorelease];

If it can reverse the process there must be some form of MKGeocoder class?

解决方案

Why must there be? Because there isn't.

There are a number of web services you can use (e.g. Google) or you could download a place name database such as http://www.geonames.org/ and import it into your app. It's probably best to import it into an SQL database which you can then search from your app.

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