有关TableView单元的问题

Question

这里我正在开发一个扩展的TableViewCell ，而我正在使用TableView didSelectRowAtIndexPath方法进行单元扩展，这里我使用了两个TableView Cell

但我需要将按钮动作SecondCell扩展。您能帮我如何在这里实现以下代码，

 - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
        // disable touch on expanded cell
    UITableViewCell *cell = [self.theTableView cellForRowAtIndexPath:indexPath];
    if ([[cell reuseIdentifier] isEqualToString:@"ExpandedCellIdentifier"]) {
        return;
    }

        // deselect row
    [tableView deselectRowAtIndexPath:indexPath
                             animated:NO];

        // get the actual index path
    indexPath = [self actualIndexPathForTappedIndexPath:indexPath];

        // save the expanded cell to delete it later
    NSIndexPath *theExpandedIndexPath = self.expandedIndexPath;

        // same row tapped twice - get rid of the expanded cell
    if ([indexPath isEqual:self.expandingIndexPath]) {
        self.expandingIndexPath = nil;
        self.expandedIndexPath = nil;
    }
        // add the expanded cell
    else {
        self.expandingIndexPath = indexPath;
        self.expandedIndexPath = [NSIndexPath indexPathForRow:[indexPath row] + 1
                                                    inSection:[indexPath section]];
    }

    [tableView beginUpdates];

    if (theExpandedIndexPath) {
        [_theTableView deleteRowsAtIndexPaths:@[theExpandedIndexPath]
                             withRowAnimation:UITableViewRowAnimationNone];
    }
    if (self.expandedIndexPath) {
        [_theTableView insertRowsAtIndexPaths:@[self.expandedIndexPath]
                             withRowAnimation:UITableViewRowAnimationNone];
    }

    [tableView endUpdates];

        // scroll to the expanded cell
    [self.theTableView scrollToRowAtIndexPath:indexPath
                             atScrollPosition:UITableViewScrollPositionMiddle
                                     animated:YES];
}

但是我想在按钮点击secondCell时实现扩展。

- (IBAction)expand:(id)sender {

}

您能帮我吗，谢谢。

Answer 1

这是我的解决方案，您可以通过禁用大小类来创建单独的.xib文件，从而轻松实现逻辑。 使用布尔变量检查是否已选择。 如果是这样，则重新加载特定的单元格并使用委托方法heightforrow并在此处确定该布尔变量。 很简单...希望您理解。 如果没有，请告诉我。 我将分享我制定的代码。

编辑帖子，下面是我的代码：-

    @implementation ViewController
    BOOL sel=NO;
    NSMutableArray *a,*b;
    NSIndexPath *path;
    - (void)viewDidLoad {
        [super viewDidLoad];
        a=[[NSMutableArray alloc] initWithObjects:@"Apple",@"Mango",@"Orange",@"Pineapple",@"Cricket",@"Bike",@"Music", nil];
        b=[[NSMutableArray alloc] initWithArray:a copyItems:YES];
            [self.tview registerNib:[UINib nibWithNibName:@"cell1" bundle:nil] forCellReuseIdentifier:@"cell"];
        // Do any additional setup after loading the view, typically from a nib.
    }

    - (void)didReceiveMemoryWarning {
        [super didReceiveMemoryWarning];
        // Dispose of any resources that can be recreated.
    }

    -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

        return a.count;
    }


    -(NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
        return 1;
    }


    -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
        [tableView beginUpdates];
        if([[a objectAtIndex:indexPath.row] isEqualToString:@"Selected"]){
            sel=NO;
        [a replaceObjectAtIndex:indexPath.row withObject:[b objectAtIndex:indexPath.row]];
        }
        else{
        [a replaceObjectAtIndex:indexPath.row withObject:@"Selected"];
            sel=YES;
        }

        [tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
        [tableView endUpdates];
    }

    -(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
        if([[a objectAtIndex:indexPath.row] isEqualToString:@"Selected"]){
        return 100;
    }
        return 60;
    }

    -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

        static NSString *cellIdentifier = @"cell";
        cell1 *cell = (cell1 *)[tableView dequeueReusableCellWithIdentifier:cellIdentifier];
        // If there is no cell to reuse, create a new one
        /*  if(cell == nil)
         {
         cell = [[listcustomcell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
         }*/
        if (!cell)
        {
            cell = [[cell1 alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
        }
        NSLog(@"%f",[self tableView:self.tview heightForRowAtIndexPath:indexPath]);
        cell.btn.frame=CGRectMake(cell.btn.frame.origin.x, [self tableView:self.tview heightForRowAtIndexPath:indexPath]*0.3, cell.btn.frame.size.width*1.3, cell.btn.frame.size.height);
        UIButton *b=[[UIButton alloc] initWithFrame:cell.btn.frame];

        [cell.btn removeFromSuperview];
        [b setTitle:@"button" forState:UIControlStateNormal];
        [cell.contentView addSubview:b];
        [b addTarget:self action:@selector(checkButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
        return cell;
    }

    - (void)checkButtonTapped:(id)sender
    {
        CGPoint buttonPosition = [sender convertPoint:CGPointZero toView:self.tview];
        NSIndexPath *indexPath = [self.tview indexPathForRowAtPoint:buttonPosition];
        if (indexPath != nil)
        {
//Just make sure that you've selected no selection option for the tableview.
            [self tableView:self.tview didSelectRowAtIndexPath:indexPath];
            NSLog(@"You've selected a row %ld",(long)indexPath.row);
        }
    }
    @end

创建一个单独的.xib并将按钮放在此处。 要调整按钮框架的大小，您需要将其删除并在刷新时再次添加。 希望能帮助到你 ：）

Answer 2

我遍历了您的代码，我认为您只需要获取该单元格即可。 请参阅以下代码以获取它。

CGPoint touchPoint = [textField convertPoint:CGPointZero toView:self.tableView];
NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint:touchPoint];
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:indexPath];

现在，执行与didSelectRowAtIndexPath相同的步骤。

Answer 3

如果您想扩展/折叠tableView单元格，那么我做了一个演示，可以为您提供所需的确切行为。 这是链接： https : //github.com/rushisangani/TableViewCellExpand

请按照演示中的说明设置展开/折叠视图的约束。

基于内容拥抱和内容压缩抗性优先级的 。

Answer 4

- (IBAction)expand:(id)sender {
CGPoint buttonPosition = [sender convertPoint:CGPointZero toView:self.theTableView];

    NSIndexPath *indexPathInner = [self.theTableView indexPathForRowAtPoint:buttonPosition];
  // disable touch on expanded cell
    UITableViewCell *cell = [self.theTableView cellForRowAtIndexPath:indexPathInner];
    if ([[cell reuseIdentifier] isEqualToString:@"ExpandedCellIdentifier"]) {
        return;
    }

        // deselect row
    [tableView deselectRowAtIndexPath:indexPath
                             animated:NO];

        // get the actual index path
    indexPath = [self actualIndexPathForTappedIndexPath:indexPath];

        // save the expanded cell to delete it later
    NSIndexPath *theExpandedIndexPath = self.expandedIndexPath;

        // same row tapped twice - get rid of the expanded cell
    if ([indexPath isEqual:self.expandingIndexPath]) {
        self.expandingIndexPath = nil;
        self.expandedIndexPath = nil;
    }
        // add the expanded cell
    else {
        self.expandingIndexPath = indexPath;
        self.expandedIndexPath = [NSIndexPath indexPathForRow:[indexPath row] + 1
                                                    inSection:[indexPath section]];
    }

    [tableView beginUpdates];

    if (theExpandedIndexPath) {
        [_theTableView deleteRowsAtIndexPaths:@[theExpandedIndexPath]
                             withRowAnimation:UITableViewRowAnimationNone];
    }
    if (self.expandedIndexPath) {
        [_theTableView insertRowsAtIndexPaths:@[self.expandedIndexPath]
                             withRowAnimation:UITableViewRowAnimationNone];
    }

    [tableView endUpdates];

        // scroll to the expanded cell
    [self.theTableView scrollToRowAtIndexPath:indexPath
                             atScrollPosition:UITableViewScrollPositionMiddle
                                     animated:YES];

}