Objective c 字符串的截断，特别是结尾的逗号。

我需要截断字符串末尾的逗号，有点像这样：

NSString *string = @" this text has spaces before and after ";
NSString *trimmedString = [string stringByTrimmingCharactersInSet:
                     [NSCharacterSet whitespaceCharacterSet]];

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除了空白字符集，还有类似于逗号字符集的东西吗

如果每个字符串的开头和结尾都有逗号/空格：

NSRange range = NSMakeRange(1, [string length-1]);
NSString *trimmedString = [string substringWithRange:range];

如果只想修剪逗号，请执行以下操作：

[NSCharacterSet characterSetWithCharactersInString:@","];