删除NSString中的多个空格 [英] Removing multiple spaces in NSString

问题描述

我有一个 NSString ，这有多个空格，我想修剪那些空格并为@如何.....是...... .....你进@你好吗。（点只是空格）

I have a NSString, this has multiple spaces, I want to trim those spaces and make a single space for e.g.@"how.....are.......you" into @"how are you".(dots are simply spaces)

我试过了

NSString *trimmedString = [user_ids stringByTrimmingCharactersInSet:
                           [NSCharacterSet whitespaceCharacterSet]];

它似乎不起作用。任何想法。

It not seems to work. Any idea.

推荐答案

您可以使用正则表达式来完成此任务：

You could use a regular expression to accomplish this:

NSError *error = nil;

NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:@"  +" options:NSRegularExpressionCaseInsensitive error:&error];

该模式是一个空格，后跟一个或多个空格。将其替换为字符串中的单个空格：

The pattern is a space followed by one or more occurrences of space. Replace this with a single space in your string:

NSString *trimmedString = [regex stringByReplacingMatchesInString:user_ids options:0 range:NSMakeRange(0, [user_ids length]) withTemplate:@" "];

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