- (UITableViewCell *)tableView:(UITableView *)tableView         cellForRowAtIndexPath:(NSIndexPath *)indexPath {        // 为其定义一个标识符，在重用机制中，标识符非常重要，这是系统用来匹配table各行cell的判断标准，在以后的学习中会体会到    static NSString *identifier = @"identifier";        // 从缓存队列中取出复用的cell(重用队列中取出cell)    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];#pragma mark -- 自定义cell    UILabel *carriers; //运营商    UILabel *telPhone; //电话号码    UILabel *time; //通话时间    UILabel *date;  //通话日期        // 如果队列中cell为空，即无复用的cell，则对其进行初始化    if (cell == nil) {                cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1  reuseIdentifier:identifier];                // 定义其辅助样式        cell.accessoryType      = UITableViewCellAccessoryDetailButton;                //运营商        CGRect carriersF = CGRectMake(30, 30, 80, 30);        carriers = [[UILabel alloc] initWithFrame:carriersF];        carriers.font = [UIFont systemFontOfSize:12];        [cell addSubview:carriers];        //电话号码        CGRect telPhoneF = CGRectMake(30, 8, 80, 30);        telPhone = [[UILabel alloc] initWithFrame:telPhoneF];        telPhone.font = [UIFont systemFontOfSize:16];        [cell addSubview:telPhone];        //通话时间        CGRect timeF = CGRectMake(270, 8, 80, 30);        time = [[UILabel alloc] initWithFrame:timeF];        time.font = [UIFont systemFontOfSize:16];        [cell addSubview:time];                //通话日期        CGRect dateF = CGRectMake(270, 30, 80, 30);        date = [[UILabel alloc] initWithFrame:dateF];        date.font = [UIFont systemFontOfSize:12];        [cell addSubview:date];    }        NSDate *  senddate=[NSDate date];        NSDateFormatter  *dateformatter=[[NSDateFormatter alloc] init];        [dateformatter setDateFormat:@"YYYY-MM-dd"];        NSString *  locationString=[dateformatter stringFromDate:senddate];        NSArray *array =  [self.dataSourceArray objectAtIndex:indexPath.row];        carriers.text =@"中国移动";    telPhone.text = array[0];    time.text = array[1];    date.text = locationString;    return cell;}