实例成员不能用于自定义类的类型 [英] Instance member cannot be used on type of custom class

问题描述

我有一个名为威士忌制造商"的课程，它只会启动新的威士忌.现在，我想在"WhiskyOverViewController"中添加新添加的威士忌.但是我面临以下问题:

I have a classe named "whisky builder" which only initiates the new Whisky. Now i would like to add the new added whiskies in my "WhiskyOverViewController". But I face the following problem:

class WhiskyOverViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {

@IBOutlet weak var tableView: UITableView!

var whiskyArray = [WhiskyBuilder]()
let stringArray = whiskyArray.map({$0.whiskyName!})
var whiskies = [Character: [String]]()
var objectsArray = [Object]()

在"stringArray"行中，出现错误实例成员'whiskyArray'不能用于类型'WhiskyOverViewController'.为什么不能在那里使用whiskyArray变量?

In the line of "stringArray" I get the error "Instance member 'whiskyArray' cannot be used on type 'WhiskyOverViewController'. Why am I not able to use the whiskyArray-variable there?

预先感谢您的帮助

推荐答案

您需要的是一个只读的计算属性:

What you need there is a read only computed property:

var stringArray: [String] { 
    return whiskyArray.map{$0.whiskyName!} 
}

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