xcode 如何获取地图上两点之间的路线方向以绘制行车路线？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/1566944/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
how to get Route directions between two points on a map to draw driving directions?
提问by Rahul Vyas
is there a way to use core location or google or some other api to provide two points on the map and get the resulting set of latitude/longitude pairs for the route?
有没有办法使用核心位置或谷歌或其他一些api在地图上提供两个点并获得路线的纬度/经度对的结果集？
i have seen in this tutorial Drawing polyines or routes on a MKMapViewthat how to draw driving direction using core graphics...but in the sample code it has route.csv which has predefined set of longitudes and latitudes.....how do i make pair of longitudes and latitudes so that i can draw driving directions.
我在本教程中看到在MKMapView 上绘制多段线或路线，如何使用核心图形绘制行驶方向……但在示例代码中，它有 route.csv，它具有预定义的一组经度和纬度……怎么办我制作了一对经度和纬度，以便我可以绘制行车路线。
回答by iKenndac
Companies invest millions of dollars into developing routing algorithms, so I very much doubt that you'll be able to get it for free anywhere (I'm happy to be wrong, though). For example, the Google Maps JavaScript API supports routing, so I guess you could hack that up. The results wouldn't be fast orpretty, mind you.
公司在开发路由算法上投入了数百万美元，所以我非常怀疑您是否能够在任何地方免费获得它（不过我很高兴错了）。例如，Google Maps JavaScript API 支持路由，所以我想你可以破解它。请注意，结果不会很快或很漂亮。
回答by Cyril Godefroy
If you have a limited use of the directions request (less than a certain amount per day) and always display results on a Google map, you do qualify for the free Google Directions API.
如果您对路线请求的使用有限（每天少于一定数量）并且始终在 Google 地图上显示结果，则您确实有资格使用免费的 Google Directions API。
https://developers.google.com/maps/documentation/directions/
https://developers.google.com/maps/documentation/directions/
Read the license part thoroughly to know the limits. You should easily be able to request a json response that will b easier to parse than an xml one (plus Apple added json parser in iOS).
仔细阅读许可部分以了解限制。您应该能够轻松请求一个 json 响应，该响应比 xml 更容易解析（加上 Apple 在 iOS 中添加的 json 解析器）。
For example
例如
If you are over the limit, you should look into their business licenses.
如果超过限额，您应该查看他们的营业执照。
回答by Codezy
Old question but MTDirectionsKit was recently open sourced and it works great:
老问题，但 MTDirectionsKit 最近开源，效果很好：
回答by Bryan J. Diaz
with Google APIyou can get directions from two points, the only problem is you just can use it once a day if you don't pay.
使用Google API，您可以从两点获取路线，唯一的问题是如果您不付费，则每天只能使用一次。
Search how to get the key API from google, there are a lots of videos on youtube talking about it.
搜索如何从 google 获取关键 API，youtube 上有很多视频在谈论它。
Furthemore, i got a library which hepls you to draw the line between points this onehttps://github.com/jd-alexander/Google-Directions-Android
此外，我有一个库可以帮助您在此点之间划清界限https://github.com/jd-alexander/Google-Directions-Android
After you implemented it in build.gradle(Module:app), implement the libraryin the class like
在你实现它之后build.gradle(Module:app)，library在类中实现像
public class LocationMapActivity extends AppCompatActivity implements RoutingListener
public class LocationMapActivity extends AppCompatActivity implements RoutingListener
will appear a error to implemets the methods (obligatoryto implement them but It's not necessary to use them).
将出现一个错误来实现这些方法（必须实现它们，但没有必要使用它们）。
I just did this:
我只是这样做：
public void route(){
Routing routing = new Routing.Builder()
.travelMode(/* Travel Mode */)
.withListener(/* Listener that delivers routing results.*/)
.waypoints(/*waypoints*/)
.key(/*api key for quota management*/)
.build();
routing.execute();
}
More info in the link.
链接中的更多信息。
