快速获取每公里分钟数，从每米秒数

问题描述

我有一个 CLLocations 数组，每个数组具有每米秒数的元素。我想从该数组计算运行拆分（每公里分钟）。如何从 CLLocations 数组中获取每公里的分钟数？

I have an array of CLLocations each with the seconds per meter element. I want to calculate the run splits from that array (Minutes per kilometer). How can I fetch the minutes per kilometer for each kilometer from the CLLocations array?

这就是我在下面获取位置的方法。

This is how I am getting the locations below.

let query = HKWorkoutRouteQuery(route: route) { (_, locations, _, error) in
        if let error = error {
            print("There was an error fetching route data: ", error)
            return
        }

        guard let locations = locations else { return }
    }
    healthStore.execute(query)

推荐答案

CLLocationSpeed 定义为以米/秒为单位的速度，请参见

CLLocationSpeed is defined as speed in meters per second, see Apple Docs

它是 Double 的别名，因此您可以将其翻译为：

It is an alias for Double, so you can just translate it with:

let speedMS = location.speed
let speedKMM = speedMS * 3 / 50

您可以使用扩展名以提高代码的可读性：

You can use an extension for better code readability:

extension CLLocationSpeed {
    func toKmM() -> Double {
        return self * 3 / 50
    }
}

当您要获得km / m，只需使用 CLLocation.speed.toKmM（）

And when you want to get km/m, you just use CLLocation.speed.toKmM()

编辑：

甚至@Leo Dabus提出的更简单的解决方案，都可以扩展CLLocation：

And even simpler solution by @Leo Dabus, extend CLLocation:

extension CLLocation { 
    var kilometersPerMinute: Double { 
        speed * 0.06 
    } 
}

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