在MKMapView中测量距离绘制路线的距离（以米为单位） [英] Measuring distance in meters from a drawn route in MKMapView

问题描述

如何计算MKMapView中两个坐标之间的路线距离？我不是要求直线距离，而是要求转弯路线的距离。

How can I calculate the route distance between two coordinates in MKMapView? I'm not asking for the straight line distance but the distance for a route with turns.

推荐答案

我假设你'重新使用 MKDirectionsRequest 来获取 MKDirectionsResponse ，从中获取路线。例如：

I'm assuming you're using an MKDirectionsRequest to get a MKDirectionsResponse from which you're getting your route. For example:

MKDirectionsRequest *request = [[MKDirectionsRequest alloc] init];

// source and destination are the relevant MKMapItem's
request.source = source;
request.destination = destination;

// Specify the transportation type
request.transportType = MKDirectionsTransportTypeAutomobile;

// If you're open to getting more than one route, requestsAlternateRoutes = YES; else requestsAlternateRoutes = NO;
request.requestsAlternateRoutes = YES;

MKDirections *directions = [[MKDirections alloc] initWithRequest:request];

[directions calculateDirectionsWithCompletionHandler:^(MKDirectionsResponse *response, NSError *error) {

    if (!error) {
        self.directionsResponse = response;                           
    }
}];

获得 MKDirectionsResponse （在此case self.directionsResponse ）并决定该响应的特定路由索引，该路由的 CLLocationDistance （以米）可以使用：

Once you get the MKDirectionsResponse (in this case self.directionsResponse) and decide on a specific route index from that response, the CLLocationDistance of that route (measured in meters) can be found using:

MKRoute *route = self.directionsResponse.routes[currentRoute];
CLLocationDistance distance = route.distance;

如果您不知道要使用哪条特定路线 - 例如如果你想根据距离决定路线 - 你可以通过一个循环来查看 directionsResponse.route 数组，以获得所有的路线距离。

And if you don't know which specific route you want to use -- ex. if you want to decide on a route based on the distance -- you can go through the directionsResponse.route array with a loop to get all the route distances.

编辑：此外，如果您想要找到时间距离（以秒为单位），您可以使用以下方式完成：

Furthermore, if you want to find the distance in time (measured in seconds), you can do so using:

NSTimeInterval seconds = route.expectedTravelTime;

---

在Swift中：

---

And in Swift:

let request:MKDirectionsRequest = MKDirectionsRequest()

// source and destination are the relevant MKMapItems
request.setSource(source)
request.setDestination(destination)

// Specify the transportation type
request.transportType = MKDirectionsTransportType.Automobile;

// If you're open to getting more than one route, 
// requestsAlternateRoutes = true; else requestsAlternateRoutes = false;
request.requestsAlternateRoutes = true

let directions = MKDirections(request: request)

directions.calculateDirectionsWithCompletionHandler ({
    (response: MKDirectionsResponse?, error: NSError?) in

    if error == nil {
        self.directionsResponse = response
    }
})

获取距离：

let route = directionsResponse.routes[currentRoute] as MKRoute
let distance = route.distance

要获得预计旅行时间：

let seconds = route.expectedTravelTime

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