字符串查找指定字符，并插入换行符

将字符串转化为可变字符串，再根据指定字符查找该字符，再在该字符前面插入换行符

NSMutableString * name = [NSMutableString stringWithFormat:@"%@",model.name];
            NSRange range = [name rangeOfString:@"（"];
            if (range.location != NSNotFound) {
                [name insertString:@"\n" atIndex:range.location];
            }