字符串截断，特别是末尾的逗号。

Question

我需要在字符串末尾截断一个逗号，有点像这样：

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

代替whitespaceCharacterSet是有什么样commaCharacterSet？

Answer 1

如果每个字符串的开头有一个逗号/空格和结尾：

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

，如果你只是要修剪的逗号：这么多

[NSCharacterSet characterSetWithCharactersInString:@","];