OC 判断全空格字符串

最新推荐文章于 2021-12-20 15:08:29 发布

Calvin_CN

最新推荐文章于 2021-12-20 15:08:29 发布

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本文介绍如何判断一个字符串是否为空或仅包含空格字符，并通过代码实现字符串的前后空格去除。

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+
 (BOOL)
 isEmpty:(NSString

*) str {

    if

(!str) {

        return

true;

    }
else

{

        //A
 character set containing only the whitespace characters space (U+0020) and tab (U+0009) and the newline and nextline characters (U+000A–U+000D, U+0085).

        NSCharacterSet

*set = [NSCharacterSet

whitespaceAndNewlineCharacterSet];

        //Returns
 a new string made by removing from both ends of the receiver characters contained in a given character set.

        NSString

*trimedString = [str stringByTrimmingCharactersInSet:set];

        if

([trimedString length] == 0) {

            return

true;

        }
else

{

            return

false;

        }

    }

}