检测用户是否进入或离开地区 - 地理编码

问题描述

我从地理编码开始。我有很多疑问。

I'm starting with geocoding. And I have a lot of doubts.

我可以做前进和后退地理编码（我想，它不完美）。

I'm able to do forward and reverse geocoding (I guess, its not perfect).

现在，我试图检测用户（设备）是否进入或离开某个区域。为此，我拿起苹果的示例代码的。该示例使用 regionMonitoring 。我已经在一台设备上尝试过了，但它运行不正常。我设置了一个半径25米的地区，当我离开这个地区时（行走）不会发生任何事情。

And now, I'm trying to detect if user (device) enters or leaves a region. For that, I picked up apple's sample code "Regions". The sample uses regionMonitoring. I already try it in a device, but its not working well. I set a region with 25 meters radius, and when I left the region (walking) doesn't happen anything.

我的问题是：还有另一种更好的方式这样做，检测用户是否进入或离开地区，比 regionMonitoring ？

My question is: there is another and better way of doing this, detect if user enters or leaves a region, than regionMonitoring?

有人可以帮我吗？

非常感谢。

推荐答案

两个 CLLocationCoordinate2D 之间的距离比我更容易：

I found a solution to calculate the distance between two CLLocationCoordinate2D it is easier than I though:

- (CLLocationDistance) DistanceBetweenCoordinate:(CLLocationCoordinate2D)originCoordinate andCoordinate:(CLLocationCoordinate2D)destinationCoordinate {

    CLLocation *originLocation = [[CLLocation alloc] initWithLatitude:originCoordinate.latitude longitude:originCoordinate.longitude];
    CLLocation *destinationLocation = [[CLLocation alloc] initWithLatitude:destinationCoordinate.latitude longitude:destinationCoordinate.longitude];
    CLLocationDistance distance = [originLocation distanceFromLocation:destinationLocation];
    [originLocation release];
    [destinationLocation release];

    return distance;
}

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