对 UITableView 中的按钮执行操作

发布于 2024-12-07 21:21:09 字数 1014 浏览 0 评论 0原文

我在 UITableViewCell 中有一个 UIButton... 我想在 UIButton 上执行操作。

我需要将数据发送到为此按钮注册的 @selector 方法，以便我可以在用户按下此按钮时执行操作。

如何实现这一点，尽管我发现选择器函数内的 (id) sender 参数并不总是在 cellForRowAtIndexPath 函数中创建的原始按钮。

在 cellForRowAtIndexPath 函数内部：

UIImage* pdfImage = [UIImage imageNamed:@"icon_pdf.png"];
UIButton* pdfButton = [UIButton buttonWithType:UIButtonTypeCustom];
[pdfButton setImage:pdfImage forState:UIControlStateNormal];
pdfButton.accessibilityHint = @"path/to/pdf/file";
pdfButton.frame = CGRectMake(0, 0, 40, 40);
[pdfButton addTarget:self action:@selector(openUrlInBrowser:) forControlEvents:UIControlEventTouchUpInside];
cell.accessoryView = pdfButton;

这是发送者函数：

-(void) openUrlInBrowser:(id)sender
{
    NSLog(@"%@", [sender class]);
    NSString * url=[sender accessibilityHint];
    NSLog(@"%@",url);
    NSLog(@"%@",sender);
    [[UIApplication sharedApplication]openURL:[NSURL URLWithString:url]];
}

原文

I've a UIButton in UITableViewCell...
I want to perform an action on the UIButton..

I need to send data to the @selector method that is registered for this button so that I can perform actions on when the user press this button.

How to accomplish that, though I found that the (id) sender parameter inside the selector function is not always the original button created in cellForRowAtIndexPath function.

Inside the cellForRowAtIndexPath function:

UIImage* pdfImage = [UIImage imageNamed:@"icon_pdf.png"];
UIButton* pdfButton = [UIButton buttonWithType:UIButtonTypeCustom];
[pdfButton setImage:pdfImage forState:UIControlStateNormal];
pdfButton.accessibilityHint = @"path/to/pdf/file";
pdfButton.frame = CGRectMake(0, 0, 40, 40);
[pdfButton addTarget:self action:@selector(openUrlInBrowser:) forControlEvents:UIControlEventTouchUpInside];
cell.accessoryView = pdfButton;

Here's the sender function:

-(void) openUrlInBrowser:(id)sender
{
    NSLog(@"%@", [sender class]);
    NSString * url=[sender accessibilityHint];
    NSLog(@"%@",url);
    NSLog(@"%@",sender);
    [[UIApplication sharedApplication]openURL:[NSURL URLWithString:url]];
}

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合约呢 2024-12-14 21:21:09

希望我正确理解这个问题 - 我通常在 uitableview 中添加的按钮上定义一个标签，它是行的索引。在 cellForRowAtIndexPath 中：

[button setTag:indexPath.row];

然后您可以将其返回到目标方法中：

- (void) showdatabases:(id) sender {
int row = [[sender valueForKey:@"tag"] intValue];
...

并使用以下方式查询单元格中的值进行处理：

UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:row inSection:0]];

或者，您可以通过访问发送者的超级视图来获得相同的结果，但我发现这更难以调试。

Hoping I understand correctly the question - I ususally define a tag on the button added in the uitableview which is the index of the row. In cellForRowAtIndexPath :

[button setTag:indexPath.row];

You can then get it back in the target method :

- (void) showdatabases:(id) sender {
int row = [[sender valueForKey:@"tag"] intValue];
...

And query the values in the cell for your processing using :

UITableViewCell* cell = [self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:row inSection:0]];

Alternatively you could get the same result by accessing the superviews of the sender but I find this more difficult to debug.

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渡你暖光 2024-12-14 21:21:09

我更喜欢使用：

-(void) openUrlInBrowser:(id)sender
{
  UIButton * button = (UIButton *)sender;
  NSString * url=[button.superview accessibilityHint];
  [[UIApplication sharedApplication]openURL:[NSURL URLWithString:url]];
}

它不依赖于表格中的单元格位置

I prefer to use:

-(void) openUrlInBrowser:(id)sender
{
  UIButton * button = (UIButton *)sender;
  NSString * url=[button.superview accessibilityHint];
  [[UIApplication sharedApplication]openURL:[NSURL URLWithString:url]];
}

it not depend on cell position in the table

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