删除字符串开头和结尾的空格 [英] removing white spaces at beginning and end of string

问题描述

我在删除字符串开头和结尾的空格时遇到了问题.例如我有一个像这样的字符串:

I've got a problem with removing whitespaces at the beginning and end of string. For e.g. I've got a string like:

\r\n\t- Someone will come here?\n- I don't know for sure...\r\n\r\n

\r\n\t- Someone will come here?\n- I don't know for sure...\r\n\r\n

我只需要在结尾处删除空格(字符串应如下所示: - Someone will come here?\n- I don't know for sure... 字符串结尾也可能有很多变体:"\ r \ n \ r \ n"，"\ r \ n"，"\ n \ r \ n"等等...

And I need to remove whitespaces only at the end and beginning (string should be look like: - Someone will come here?\n- I don't know for sure... Also there could be a lot of variants of string end: "\r\n\r\n", "\r\n", "\n\r\n" and so on...

谢谢.

推荐答案

您的字符串不仅包含空格，而且还包含换行符.

Your string contains not only whitespace but also new line characters.

将stringByTrimmingCharactersInSet与whitespaceAndNewlineCharacterSet一起使用.

let string = "\r\n\t- Someone will come here?\n- I don't know for sure...\r\n\r\n"
let trimmedString = string.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet())

在Swift 3中，清理得更多:

In Swift 3 it's more cleaned up:

let trimmedString = string.trimmingCharacters(in: .whitespacesAndNewlines)

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