测量 MKMapView 中绘制路线的距离（以米为单位）

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。

我假设你正在使用MKDirectionsRequest得到一个MKDirectionsResponse您从中获取路线。例如：

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;                           
    }
}];

一旦你得到MKDirectionsResponse（在这种情况下self.directionsResponse）并根据该响应决定特定的路由索引，CLLocationDistance该路线的长度（以米为单位）可以使用以下方法找到：

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

如果您不知道要使用哪条具体路线 - 例如。如果您想根据距离决定路线 - 您可以通过directionsResponse.route带循环的数组来获取所有路线距离。

编辑：此外，如果您想查找时间距离（以秒为单位），您可以使用：

NSTimeInterval seconds = route.expectedTravelTime;

在斯威夫特中：

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

要获得预计的行程时间：

let seconds = route.expectedTravelTime