我有一个oc版本
public class Heading
{
private string[] m_names[]=new string[8] { "N","NE","E","SE","S","SW","W","NW" };
public string this[float angle]{get{return m_names[((int)((angle-22.5f)/45.0f))&7]}}
}
然后我转换成swift版本
func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) {
let trueHeading = newHeading.trueHeading
let angle = Double.pi / 180 * trueHeading
let dir = [ "N","NE","E","SE","S","SW","W","NW" ]
let dir2=dir[(((trueHeading-22.5)/45.0)) as Int & 7]
}
但这行不通,这行出现错误“Expected ',' separator”
let dir2=dir[(((trueHeading-22.5)/45.0)) as Int & 7]
最佳答案
你想要:
func compassDirection(for heading: CLLocationDirection) -> String? {
if heading < 0 { return nil }
let directions = ["N", "NE", "E", "SE", "S", "SW", "W", "NW"]
let index = Int((heading + 22.5) / 45.0) & 7
return directions[index]
}
注意,是+
,不是-
。
或者您可以使用 rounded
来避免混淆是加还是减 22.5:
let index = Int((heading / 45).rounded()) % 8
然后您可以像这样使用此 compassDirection
结果:
func locationManager(_ manager: CLLocationManager, didUpdateHeading newHeading: CLHeading) {
guard let direction = compassDirection(for: newHeading.trueHeading) else {
// handle lack of heading here
return
}
// you can use `direction` here
}
关于swift - 如何使用swift将方向度数转换为文字?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/48118390/