Ios8 在swift2中使用self

我尝试用swift 2编写以下代码：

//: Playground - noun: a place where people can play

import Foundation

struct Point {

var x: Double
var y: Double
}

func distanceTo (#point: Point) -> Double {

let a = abs(self.x - point.x)
let b = abs(self.y - point.y)

let c = sqrt(a * a + b * b)

return c
}


let pointA = Point(x: 1.0, y: 2.0)
let pointB = Point(x: 4.0, y: 6.0)
let distance = pointA.distanceTo (point: pointB)

但我有一个错误：

#has been remove from swift, so  i change the code to 

func distanceTo (#point: Point) -> Double

但后来我又犯了一个错误：

use of unresolved identifier 'self'

有没有关于如何在swift 2中修复此错误的线索

---

thanx

您需要将distanceTo作为点结构的成员-请参阅：

import Foundation

struct Point {

  var x: Double
  var y: Double

  func distanceTo (point point: Point) -> Double {

    let a = abs(self.x - point.x)
    let b = abs(self.y - point.y)

    let c = sqrt(a * a + b * b)

    return c
  }
}




let pointA = Point(x: 1.0, y: 2.0)
let pointB = Point(x: 4.0, y: 6.0)
let distance = pointA.distanceTo (point: pointB)

---

我认为您打算将

distance设置为
Point
的成员，因此必须将其放入
struct
定义中。否则它将不知道
self
指的是什么：

struct Point {
    var x: Double
    var y: Double

    func distanceTo (point point: Point) -> Double {

        let a = abs(self.x - point.x)
        let b = abs(self.y - point.y)

        let c = sqrt(a * a + b * b)

        return c
    }
}

let pointA = Point(x: 1.0, y: 2.0)
let pointB = Point(x: 4.0, y: 6.0)
let distance = pointA.distanceTo (point: pointB)

顺便说一句，您不需要
点：
，通常会将其合并到方法名称中：

struct Point {
    var x: Double
    var y: Double

    func distanceToPoint(point: Point) -> Double {

        let a = abs(self.x - point.x)
        let b = abs(self.y - point.y)

        let c = sqrt(a * a + b * b)

        return c
    }
}

let pointA = Point(x: 1.0, y: 2.0)
let pointB = Point(x: 4.0, y: 6.0)
let distance = pointA.distanceToPoint(pointB)

仅供参考，您也可以使用
hypot（a，b）
，而不是
sqrt（a*a+b*b）
。thax alot Shripada:）是的，Thanx您罗布，我是新来的，尝试探索该功能以及如何正确使用它，Thanx谢谢您的帮助。