distanceFromLocation - 计算两点之间的距离 [英] distanceFromLocation - Calculate distance between two points

问题描述

关于Core Location的一个简单问题，我正在尝试计算两点之间的距离，代码如下：

Just a quick question on Core Location, I'm trying to calculate the distance between two points, code is below:

    -(void)locationChange:(CLLocation *)newLocation:(CLLocation *)oldLocation
    {   

    // Configure the new event with information from the location.
        CLLocationCoordinate2D newCoordinate = [newLocation coordinate];
        CLLocationCoordinate2D oldCoordinate = [oldLocation coordinate];

        CLLocationDistance kilometers = [newCoordinate distanceFromLocation:oldCoordinate] / 1000; // Error ocurring here.
        CLLocationDistance meters = [newCoordinate distanceFromLocation:oldCoordinate]; // Error ocurring here.
}

我在最后两行收到以下错误：

I'm getting the following error on the last two lines:

错误：无法转换为指针类型

error: cannot convert to a pointer type

我一直在搜索谷歌，但我找不到任何东西。

I've been searching Google, but I cannot find anything.

推荐答案

试试这个：

CLLocationDistance meters = [newLocation distanceFromLocation:oldLocation];

您尝试使用的方法是 CLLocation 对象：）

The method you're trying to use is a method on a CLLocation object :)

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