iOS聊天界面cell从下至上滚动

来源：互联网发布：技术支持盘古网络编辑：程序博客网时间：2024/06/12 22:00

import "ChatView.h"

import "ChatCell.h"

@interface ChatView ()

@property (nonatomic, strong) NSMutableArray dataSoure;
@property (nonatomic, strong) UITableView tableView;

@end

@implementation ChatView

(instancetype)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {

  self.backgroundColor = [UIColor clearColor];  self.dataSoure = [NSMutableArray array];  self.tableView = [[UITableView alloc]initWithFrame:self.bounds];  _tableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;  _tableView.separatorStyle = UITableViewCellSeparatorStyleNone;  _tableView.showsVerticalScrollIndicator = NO;  _tableView.backgroundColor = [UIColor clearColor];  _tableView.delegate = self;  _tableView.dataSource = self;

_tableView.transform = CGAffineTransformMakeScale(1, -1);

  [self addSubview:self.tableView];

}
return self;
}

(void)reloadData
{
[self.tableView reloadData];
[self.tableView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];
}

pragma mark - UITableViewDelegate && UITableViewDataSource

(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return self.dataSoure.count;
}
(UITableViewCell )tableView:(UITableView )tableView cellForRowAtIndexPath:(NSIndexPath)indexPath
{
static NSString identifier = @"LiveChatCell";
ChatCell *cell = [tableView dequeueReusableCellWithIdentifier:identifier];
if (!cell) {
```
  cell = [[ChatCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:identifier];
```
}
cell.contentView.transform = CGAffineTransformMakeScale(1, -1);
NSInteger index = self.dataSoure.count-1-indexPath.row;
cell.item = self.dataSoure[index];//cell填充数据
return cell;
}
(CGFloat)tableView:(UITableView )tableView heightForRowAtIndexPath:(NSIndexPath)indexPath
{
NSInteger index = self.dataSoure.count-1-indexPath.row;
return [ChatCell cellHeightWithItem:self.dataSoure[index] tableView:tableView];
}

pragma mark - UIScrollViewDelegete

//开始拖拽

(void)scrollViewWillBeginDragging:(UIScrollView *)scrollView
{
[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(scrollStopTime) object:nil];
}

//结束拖拽

(void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
[self performSelector:@selector(scrollStopTime) withObject:nil afterDelay:3.0f];
}
(void)scrollStopTime
{
[self.tableView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];
}
@end

1 0