Swift:替换字符串中的字符 - 没有 stringByReplacingOccurrencesOfString [英] Swift: replace character in string - without stringByReplacingOccurrencesOfString

问题描述

好的，假设我有一个 String 像

OK, so say I have a String like

let myString = "my string: hello"

我想用，"替换:".我做到了:

and I want to replace ":" with ",". I got as far as this:

let characters = map(Array(myString), {$0 == ":" ? "," : $0})

返回一个 MapCollectionView, Character>.有没有一种简单的方法可以将其转换回 String ?

Which returns a MapCollectionView<Array<Character>, Character>. Is there a simple way to convert this back into a String?

推荐答案

这个呢?通过使用 + 减少"它们将所有字符组合成一个字符串操作员:

What about this? Combine all characters to a string by "reducing" them with the + operator:

let str = Array(characters).reduce("", combine: +)
println(str)
// Output: my string, hello

更新:另一种(也许更好)的解决方案:

Update: An alternative (perhaps nicer) solution:

var str = ""
str.extend(characters)

使用extend()，可以在没有中间Array的情况下完成字符串替换:

Using extend(), the string replacement could be done without an intermediate Array:

let myString = "my string: hello" as String
var myNewString = ""
myNewString.extend(map(myString.generate(), {$0 == ":" ? "," : $0} ))

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