如何在 table 视图中创建单选按钮

Question

我在 table 视图单元格中有一个单选按钮。这是我的单选按钮

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
 UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"myCell"];
if(cell == nil) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"myCell"];

    cell.selectionStyle = UITableViewCellSelectionStyleNone;

 radiobtn = [UIButton buttonWithType:UIButtonTypeCustom];
    radiobtn.frame = CGRectMake(30, 0, 15, 14.5);

    [radiobtn setImage:[UIImage imageNamed:@"unselect"] forState:UIControlStateNormal];
    [radiobtn setImage:[UIImage imageNamed:@"select"] forState:UIControlStateSelected];
    [radiobtn addTarget:self action:@selector(radiobtn:) forControlEvents:UIControlEventTouchUpInside];
    cell.accessoryView = radiobtn;
}
cell.textLabel.text = [array objectAtIndex:indexPath.row];
 return cell;

}

-(void)radiobtn:(id)sender

{


 if([sender isSelected])

{
[sender setSelected:NO];
}  else
[sender setSelected:YES];
} }

在上面的代码中，单选按钮没有变为选中状态。请帮我编码。

Answer 1

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"myCell"];
if(cell == nil) {
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"myCell"];

}

cell.selectionStyle = UITableViewCellSelectionStyleNone;
UIButton *newRadioButton;
newRadioButton = [UIButton buttonWithType:UIButtonTypeCustom];
newRadioButton.frame = CGRectMake(30, 0, 15, 14.5);

[newRadioButton setImage:[UIImage imageNamed:@"unselect"] forState:UIControlStateNormal];
[newRadioButton setImage:[UIImage imageNamed:@"select"] forState:UIControlStateSelected];
[newRadioButton addTarget:self action:@selector(radiobtn:) forControlEvents:UIControlEventTouchUpInside];
cell.accessoryView = newRadioButton;
cell.textLabel.text = [array objectAtIndex:indexPath.row];
return cell;

}

Answer 2

为控件事件 UIControlEventValueChanged 设置目标操作。
在动作发生之前设置特定状态的图像（在cellForRowAtIndexPath方法中）。通过使用 setImage:forState: 你实际上并没有改变当前的控件图像，你只是说控件使用确切的图像来表示该状态发生的某些控件状态。不要使用 highlighted 状态，以防 selected 状态更合适。尝试通过 [radiobtn setSelected:YES] 或 [radiobtn setSelected:!radiobtn.isSelected].

Answer 3

在创建按钮时设置选中和未选中状态的图像。

radiobtn = [UIButton buttonWithType:UIButtonTypeCustom];
radiobtn.frame = CGRectMake(30, 0, 15, 14.5);
[radiobtn setImage:[UIImage imageNamed:@"unselect"]] forState:UIControlStateNormal];
[radiobtn setImage:[UIImage imageNamed:@"select"]] forState:UIControlStateSelected];
 radiobtn.tag=1;
[radiobtn addTarget:self action:@selector(radiobtn:) forControlEvents:UIControlEventTouchUpInside];
cell.accessoryView = radiobtn;

单击按钮时，您只需更改选定状态即可。

-(void)radiobtn:(UIButton *)sender
{
    if([sender isSelected])
    {
        [sender setSelected:NO];
    }

     else
     {
         [sender setSelected:YES];
      }
}

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