字符串截斷，特別是末尾的逗號。

Question

我需要在字符串末尾截斷一個逗號，有點像這樣：

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

代替whitespaceCharacterSet是有什麼樣commaCharacterSet？

Answer 1

如果每個字符串的開頭有一個逗號/空格和結尾：

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

，如果你只是要修剪的逗號：這麼多

[NSCharacterSet characterSetWithCharactersInString:@","];