从Objective-C中的字符串中删除空格 [英] Remove whitespace from string in Objective-C

问题描述

我有几个字符串.有些在开始时有一个空格，有些则没有.我想检查字符串是否以空格开头，如果是，请将其删除.

I have a couple of strings. Some have a whitespace in the beginning and some not. I want to check if a string begins with a whitespace and if so remove it.

推荐答案

NSString类中有解决该问题的方法.检查stringByTrimmingCharactersInSet:(NSCharacterSet *)set.您应该使用[NSCharacterSet whitespaceCharacterSet]作为参数:

There is method for that in NSString class. Check stringByTrimmingCharactersInSet:(NSCharacterSet *)set. You should use [NSCharacterSet whitespaceCharacterSet] as parameter:

NSString *foo = @" untrimmed string ";
NSString *trimmed = [foo stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceCharacterSet]];

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