Objective C 如何检测 NSString 中的一个或多个空格 [英] Objective C How to detect one or multiple spaces in a NSString

问题描述

我已经看到了我的任务的一个答案，但现在找不到了.我想检测一个字符串是否有空词并且至少包含"或"(两个空格"或多个空格，或者不包含.如果没有，我会将其添加到 Nsmutablearray.如果是，有空或至少有一个空格，我不希望它被写入 mutablearray.

I have seen one answer for my task, but I couldnt find it now. I want to detect whether a string has empty word and contains at least "" or " " (two spaces" or more multiple spaces, OR not. If not, I would add this to Nsmutablearray. If yes with empty or at least one space, I would like it not to be written to mutablearray.

如何解决这个问题?

编辑 2011 年 10 月 12 日:

EDIT 12 October 2011:

伙计们，谢谢.

再次抱歉，我不清楚我的愿望.我想检查一个字符串是否为空或包含没有任何字符的空格.我已经在下面发布了我的答案.

Again I am sorry that I was unclear about my wish. I wanted to check if a string is empty or contains whitespaces without any character. I have posted my answer below.

推荐答案

    if( bookmarked.length == 0 )
    {
        NSLog (@"not allowed: empty");

    } 
    else if ([[bookmarked stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]] length] == 0)        
    { 
        NSLog (@"not allowed: whitespace(s)");
    }

    else 
    {
        [bookmarklist addObject:bookmarked];
    }

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