试图从数组随机元素存储在变量斯威夫特2时出错 [英] Error when trying to store random element from array in variable Swift 2

问题描述

我区codeS的数组，我从一个变量数组试图存储一个随机元素，我得到一个错误实例成员区域codeS不能对类型'的ViewController使用'。有什么建议么？

  VAR区域codeS = [209，213，310，323，408，415]
VAR firstThree =区域codeS [INT（arc4random_uniform（UInt32的（区codes.count）））]
 

解决方案

您无法访问您在初始化时数组。你的属性改为只读属性计算：

  VAR firstThree：诠释{返回区codeS [INT（arc4random_uniform（UInt32的（区codes.count）））]}
 

I have an array of area codes and I am trying store a random element from the array in a variable and I get an error "instance member 'areaCodes' can not be used on type 'ViewController' ". Any suggestions?

var areaCodes = [209, 213, 310, 323, 408, 415]
var firstThree = areaCodes[Int(arc4random_uniform(UInt32(areaCodes.count)))]

解决方案

You can not access your array at initialization time. Change your property to a read only computed property:

var firstThree: Int { return areaCodes[Int(arc4random_uniform(UInt32(areaCodes.count)))] }

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