检查NSString是否只是由空格 [英] Check if an NSString is just made out of spaces

问题描述

我想检查一个特定的字符串是否只是由空格组成。它可以是任何数量的空间，包括零。

I want to check if a particular string is just made up of spaces. It could be any number of spaces, including zero. What is the best way to determine that?

推荐答案

NSString *str = @"         ";
NSCharacterSet *set = [NSCharacterSet whitespaceCharacterSet];
if ([[str stringByTrimmingCharactersInSet: set] length] == 0)
{
    // String contains only whitespace.
}

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