如何将 Swift 数组转换为字符串? [英] How do I convert a Swift Array to a String?

问题描述

我知道如何以编程方式执行此操作，但我确定有一种内置方法...

I know how to programmatically do it, but I'm sure there's a built-in way...

我使用过的每种语言都有某种默认文本表示，用于对象集合，当您尝试将 Array 与字符串连接或将其传递给 print() 函数等时，它会吐出这些表示.Apple 的 Swift 语言有一个内置的方法可以轻松地将数组转换为字符串，或者我们在对数组进行字符串化时总是必须明确?

Every language I've used has some sort of default textual representation for a collection of objects that it will spit out when you try to concatenate the Array with a string, or pass it to a print() function, etc. Does Apple's Swift language have a built-in way of easily turning an Array into a String, or do we always have to be explicit when stringifying an array?

推荐答案

如果数组包含字符串，可以使用String的join方法:

If the array contains strings, you can use the String's join method:

var array = ["1", "2", "3"]

let stringRepresentation = "-".join(array) // "1-2-3"

在 Swift 2 中:

var array = ["1", "2", "3"]

let stringRepresentation = array.joinWithSeparator("-") // "1-2-3"

如果您想使用特定的分隔符(连字符、空格、逗号等)，这会很有用.

This can be useful if you want to use a specific separator (hypen, blank, comma, etc).

否则你可以简单地使用 description 属性，它返回数组的字符串表示:

Otherwise you can simply use the description property, which returns a string representation of the array:

let stringRepresentation = [1, 2, 3].description // "[1, 2, 3]"

提示:任何实现Printable 协议的对象都有一个description 属性.如果您在自己的类/结构中采用该协议，您也可以使它们易于打印

Hint: any object implementing the Printable protocol has a description property. If you adopt that protocol in your own classes/structs, you make them print friendly as well

在 Swift 3

• join 变成 joined，例如 [nil, "1", "2"].flatMap({$0}).joined()
• joinWithSeparator 变为 joined(separator:)(仅适用于字符串数组)

• join becomes joined, example [nil, "1", "2"].flatMap({$0}).joined()
• joinWithSeparator becomes joined(separator:) (only available to Array of Strings)

在 Swift 4

var array = ["1", "2", "3"]
array.joined(separator:"-")

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