UITableViewCell定制附件 - 获取附件所在行的行号

Question

我有一个很大的问题。我正在尝试在UITableView中的每个UITableViewCell上创建一个收藏按钮。这个功能非常好用，当前我已经实现了按下时的动作和选择器。

accessory = [UIButton buttonWithType:UIButtonTypeCustom];
[accessory setImage:[UIImage imageNamed:@"star.png"] forState:UIControlStateNormal];
accessory.frame = CGRectMake(0, 0, 15, 15);
accessory.userInteractionEnabled = YES;
[accessory addTarget:self action:@selector(didTapStar) forControlEvents:UIControlEventTouchUpInside];
cell.accessoryView = accessory;

And选择器：

- (void) didTapStar {
    UITableViewCell *newCell = [tableView cellForRowAtIndexPath:/* indexPath? */];

    accessory = [UIButton buttonWithType:UIButtonTypeCustom];
    [accessory setImage:[UIImage imageNamed:@"stared.png"] forState:UIControlStateNormal];
    accessory.frame = CGRectMake(0, 0, 26, 26);
    accessory.userInteractionEnabled = YES;
    [accessory addTarget:self action:@selector(didTapStar) forControlEvents:UIControlEventTouchDown];
    newCell.accessoryView = accessory;
}

现在，问题来了：我想知道被点击的附件所属的行是哪一行。

我应该如何做到这一点？

谢谢 :)

- Emil

---

看这个：简单、快速、容易。https://dev59.com/BVkS5IYBdhLWcg3wp4Qi#55156685 - Mushrankhan

Answer 1

我会使用以下代码：

- (void)didTapStar:(id)sender {
  NSIndexPath *indexPath = [tableView indexPathForCell:(UITableViewCell *)[sender superview]];
}

- Bas Dirkse

Answer 2

将您的动作进行一些调整。

- (void)action:(id)sender forEvent:(UIEvent *)event

在这个方法里：

NSIndexPath *indexPath = [tableView indexPathForRowAtPoint:[[[event touchesForView:sender] anyObject] locationInView:tableView]];

这将为您获取行的索引路径。

- Giao

---

anyObject 在这里的作用是什么？它是做什么的？ - Illep

@Giao 我只是好奇，anyObject 是什么作用？ - Emil

@lllep @Emil anyObject是NSSet中的一个实例方法，该方法简单地返回集合中的任何单个对象。在此示例中，[[[event touchesForView:sender] anyObject]返回一个UITouch对象。 - Jeffery Li

Answer 3

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath {   
    // To set custom cell accessory                     
    UIImage *image = [UIImage   imageNamed:@"white_arrow_right.png"];
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    CGRect frame = CGRectMake(cell.frame.size.width  - image.size.width, cell.frame.size.height - image.size.height, image.size.width, image.size.height);
    button.frame = frame;
    [button setBackgroundImage:image forState:UIControlStateNormal];
    [button addTarget:self action:@selector(accessoryButtonTapped:event:)  forControlEvents:UIControlEventTouchUpInside];
    button.backgroundColor = [UIColor clearColor];
    cell.accessoryView = button;
}     

- (void)accessoryButtonTapped:(id)sender event:(id)event {
    NSSet *touches = [event allTouches];
    UITouch *touch = [touches anyObject];
    CGPoint currentTouchPosition = [touch locationInView:self.tableView];
    NSIndexPath *indexPath = [self.tableView indexPathForRowAtPoint: currentTouchPosition];
    if (indexPath != nil){
        [self tableView: self.tableView accessoryButtonTappedForRowWithIndexPath: indexPath];
    }
}

- (void)tableView:(UITableView *)tableView accessoryButtonTappedForRowWithIndexPath:(NSIndexPath *)indexPath{                
    DetailViewController *detailView =[[DetailViewController alloc]init];
    [self.navigationController pushViewController:detailView animated:YES];
}

- Swati Ardeshna