快速获取每公里分钟数，从每米秒数 [英] Swift fetch minutes per kilometer from seconds per meter

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 Apple Docs

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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