截断字符串，特别是末尾的逗号。

Question

我需要在字符串末尾截断逗号，有点像这样：

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

而不是whitespaceCharacterSet有类似commaCharacterSet的东西吗？

Answer 1

如果每个字符串在开头和结尾都有逗号/空格：

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

如果您只想修剪逗号：

[NSCharacterSet characterSetWithCharactersInString:@","];