如何使用 iPhone 方法 -(CLLocationDistance)distanceFromLocation:(const CLLocation *)location

发布于 2024-10-02 03:04:14 字数 326 浏览 2 评论 0原文

我是一名学习 Objective-C 的新 iPhone 开发人员，正在尝试使用 SQLite 表中的纬度/经度坐标动态计算用户纬度/经度坐标之间的距离。我知道我们可以使用 CLLocations 方法：

(CLLocationDistance)distanceFromLocation:(const CLLocation *)location

来执行此操作，但根据我所拥有的数据，我不确定如何使用它。考虑到上述方法仅处理 CLLocation 类型的位置对象，如何使用上述使用纬度/经度坐标对的方法？谁能给我一个简单的例子来说明如何使用两对纬度/经度坐标来使用此方法？

原文

I am a new iPhone developer learning Objective-C, and am trying to dynamically calculate the distances between the users latitude/longitude coordinates, with latitude/longitude coordinates in a SQLite table. I know that we can use CLLocations method:

(CLLocationDistance)distanceFromLocation:(const CLLocation *)location

to do this, but I'm not sure how to use it given the data that I have. How does one use the above method using pairs of latitude/longitude coordinates, considering the above method only deals with location objects of type CLLocation? Can anyone give me a simple example of how to use this method using two pairs of latitude/longitude coordinates?

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不一样的天空 2024-10-09 03:04:14

只需根据您的数据创建 CLLocation 对象：

// Assumption: lat1, lon1 and lat2, lon2 are double values containing the coordinates
CLLocation *firstLocation = [[[CLLocation alloc] initWithLatitude:lat1 longitude:lon1] autorelease];
CLLocation *secondLocation = [[[CLLocation alloc] initWithLatitude:lat2 longitude:lon2] autorelease];
CLLocationDistance distance = [secondLocation distanceFromLocation:firstLocation];

Just create CLLocation objects from your data:

// Assumption: lat1, lon1 and lat2, lon2 are double values containing the coordinates
CLLocation *firstLocation = [[[CLLocation alloc] initWithLatitude:lat1 longitude:lon1] autorelease];
CLLocation *secondLocation = [[[CLLocation alloc] initWithLatitude:lat2 longitude:lon2] autorelease];
CLLocationDistance distance = [secondLocation distanceFromLocation:firstLocation];

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