Question

她的tableAllconacts是我的nsmutablearray

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

{

    static NSString *CellIdentifier = @"Cell";


    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.selectionStyle= UITableViewCellSeparatorStyleNone;


        btnChk =[UIButton buttonWithType:UIButtonTypeCustom];
        btnChk.frame =CGRectMake(280, 4, 32, 32);
        btnChk.backgroundColor =[UIColor clearColor];
        [btnChk addTarget:self action:@selector(btnCheckmarkClicked:) forControlEvents:UIControlEventTouchUpInside];
        btnChk.tag=indexPath.row;


        UIImageView *separator=[[UIImageView alloc ]initWithFrame:CGRectMake(0, 44, 320, 1)];
        separator.image=[UIImage imageNamed:@"divider.png"];
        [cell.contentView addSubview:separator];

    }

    cell.textLabel.font = [UIFont systemFontOfSize:18];
    cell.textLabel.textColor =[UIColor whiteColor];
    cell.textLabel.text = [appdeleObj.arrDriverName objectAtIndex:indexPath.row];




    NSString *strValue=[appdeleObj.arrDriverName objectAtIndex:indexPath.row];

    NSLog(@"%@",strValue);

        if ([[[NSUserDefaults standardUserDefaults]valueForKey:@"Checked"]isEqualToString:strValue] )

        {

            if ([[NSUserDefaults standardUserDefaults ] boolForKey:@"showChkmark"] )

            {

       [btnChk setBackgroundImage:[UIImage imageNamed:@"radio_on.png"] forState:UIControlStateNormal];            

        }
            else
            {

                [btnChk setBackgroundImage:[UIImage imageNamed:@"radio_off.png"] forState:UIControlStateNormal];

            }
        }
        else

        {
            NSLog(@"%@",btnChk.currentBackgroundImage);
            [btnChk setBackgroundImage:[UIImage imageNamed:@"radio_off.png"] forState:UIControlStateNormal];

        }
    [cell.contentView addSubview:btnChk];
    return cell;

}

按钮操作

-(void)btnCheckmarkClicked: (UIButton *)sender
{

  CGPoint touchPoint = [sender convertPoint:CGPointZero toView:tableAllContacts];
  NSIndexPath *indexPath = [tableAllContacts indexPathForRowAtPoint:touchPoint];

// No need to use tag sender will keep the reference of clicked button
  UIButton *button = (UIButton *)sender;

    appdeleObj.strCheckUnchek =[appdeleObj.arrDriverName objectAtIndex:indexPath.row];

    if ([button.currentBackgroundImage isEqual:[UIImage imageNamed:@"radio_on.png"]])
    {
        [[NSUserDefaults standardUserDefaults] setValue:@"radio_off.png" forKey:@"Checked"];
     //   [button setBackgroundImage:nil forState:UIControlStateNormal];
        [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"showChkmark"];

    }
    else
    {
        [[NSUserDefaults standardUserDefaults] setValue:appdeleObj.strCheckUnchek forKey:@"Checked"];
   // [button setBackgroundImage:[UIImage imageNamed:@"radio_on.png"] forState:UIControlStateNormal];
        [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"showChkmark"];


    }

    [tableAllContacts reloadData];

}

Answer 1

更改背景图片的代码行在您发布的代码中进行了注释。

您正在方法内创建按钮。

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

这将绘制按钮，总是重新加载表格。我的建议是尝试在上面的方法之外创建按钮，只需在方法中设置标记。

Answer 2

试试这段代码：

   -(void)btnCheckmarkClicked: (UIButton *)sender
    {

      CGPoint touchPoint = [sender convertPoint:CGPointZero toView:tableAllContacts];
      NSIndexPath *indexPath = [tableAllContacts indexPathForRowAtPoint:touchPoint];

    // No need to use tag sender will keep the reference of clicked button
      UIButton *button = (UIButton *)sender;

        appdeleObj.strCheckUnchek =[appdeleObj.arrDriverName objectAtIndex:indexPath.row];

        if ([button.currentBackgroundImage isEqual:[UIImage imageNamed:@"radio_on.png"]])
        {
//Update the BackGround Image When you click the button
    [button setBackgroundImage:[UIImage imageNamed:@"radio_off.png"] forState:UIControlStateNormal];
            [[NSUserDefaults standardUserDefaults] setValue:@"radio_off.png" forKey:@"Checked"];
         //   [button setBackgroundImage:nil forState:UIControlStateNormal];
            [[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"showChkmark"];

        }
        else
        {

    [button setBackgroundImage:[UIImage imageNamed:@"radio_on.png"] forState:UIControlStateNormal];
            [[NSUserDefaults standardUserDefaults] setValue:appdeleObj.strCheckUnchek forKey:@"Checked"];
       // [button setBackgroundImage:[UIImage imageNamed:@"radio_on.png"] forState:UIControlStateNormal];
            [[NSUserDefaults standardUserDefaults] setBool:YES forKey:@"showChkmark"];


        }

        [tableAllContacts reloadData];

    }

Answer 3

它可能对你有帮助。

在 if(cell == nil)条件写下这个。

btnChk =[UIButton buttonWithType:UIButtonTypeCustom];
btnChk.frame =CGRectMake(280, 4, 32, 32);
btnChk.backgroundColor =[UIColor clearColor];
[btnChk addTarget:self action:@selector(btnCheckmarkClicked:) forControlEvents:UIControlEventTouchUpInside];
btnChk.tag=indexPath.row;
[cell.contentView addSubview:btnChk]; //added this line to your code.

out if if条件使用标签

获得相同的按钮

UIButton *btn2 = (UIButton *)[cell.contentView viewWithTag:indexPath.row];

现在将您的图像应用于此按钮。

Answer 4

不是这样做，为什么不为按钮的不同状态设置两个背景图像，如下所示？

[button setBackgroundImage:[UIImage imageNamed:@"radio_on.png"]
                  forState:UIControlStateSelected];
[button setBackgroundImage:[UIImage imageNamed:@"radio_off.png"]
                  forState:UIControlStateNormal];

然后你可以反转button.selected中-(void)btnCheckmarkClicked: (UIButton *)sender字段的值;然后该按钮将自动为您更新其backgroundImage。

button.selected = !button.selected;

希望这有帮助。

如果设置了，则无法在uiTableview中更改按钮的背景图像

4 个答案: