tableView 自动滚动到底部

Posted 2020-12-03 jackie-subdai

- (void)addData:(id)object{

   

   

    NSInteger count = self.dataArray.count;

   

   

   

    _index ++;

    NSString * str = [NSString stringWithFormat:@"当前第%zd行",_index];

    [self.dataArray addObject:str];

   

    if (count * 44.0f > self.tableView.height) {

        NSMutableArray *insert = [[NSMutableArray alloc] init];

        for (NSInteger index = count; index < count+1; index++) {

            NSIndexPath *indexPath = [NSIndexPath indexPathForRow:index inSection:0];

            [insert addObject:indexPath];

        }

        [self.tableView beginUpdates];

        [self.tableView insertRowsAtIndexPaths:insert withRowAnimation:UITableViewRowAnimationFade];

        [self.tableView endUpdates];

        [self.tableView layoutIfNeeded];

       

        [self changeInsets:object];

        [self scrollToBottom];

    } else {

        [self.tableView reloadData];

    }

 

   

  

}

 

 

- (void)changeInsets:(id)object

{

    CGFloat height = 0;

    height += 44.0f;

//    for (NTESMessageModel *model in newModels) {

//        height += 44.0f;

//    }

    UIEdgeInsets insets = self.tableView.contentInset;

    CGFloat contentHeight = self.tableView.contentSize.height - insets.top;

    contentHeight += height;

    CGFloat top = contentHeight > self.tableView.height? 0 : self.tableView.height - contentHeight;

    insets.top = top;

   

//    MyLog(@"tableViewHeight == %f",self.tableView.height);

//    MyLog(@"top == %f",top);

   

    self.tableView.contentInset = insets;

}

 

- (void)scrollToBottom

{

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

        CGFloat offset = self.tableView.contentSize.height - self.tableView.height;

        [self.tableView scrollRectToVisible:CGRectMake(0, offset, self.tableView.width, self.tableView.height) animated:YES];

    });

}