Question

我有一个UITabBarController，它有3个标签（tab1，tab2，tab3）。每个选项卡都有1个UITableView，每个表视图的每一行都有一个按钮。现在我希望用户点击tab2上的任何按钮，tab1中的按钮应该已经更改了图像。我可以在tab1中获取按钮的标签，但是当我在tab2中单击按钮时我不知道如何在tab1中获取按钮的标签。我怎么能这样做？

非常感谢。

这是我在tab1中的代码创建表视图：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *CellIdentifier = @"Cell";

    UITableViewCell *cell = [_tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease];

        UIButton *market= [UIButton buttonWithType:UIButtonTypeCustom];

        [market setFrame:CGRectMake(200, 6, 30, 30)];

        market.tag = 4000;
        [market addTarget:self action:@selector(marketPressedAction:) forControlEvents:UIControlEventTouchDown];

        [cell.contentView addSubview:market];

        UILabel *pricelabel = [[UILabel alloc] initWithFrame:CGRectMake(80, 0, 80, 30)];
        pricelabel.backgroundColor = [UIColor clearColor];
        pricelabel.font = [UIFont fontWithName:@"Helvetica" size:16];
        pricelabel.font = [UIFont boldSystemFontOfSize:16];
        pricelabel.textColor = [UIColor darkGrayColor];
        pricelabel.tag = 3000;
        pricelabel.textAlignment = NSTextAlignmentRight;

        [cell.contentView addSubview: pricelabel];
        [pricelabel release];
    }

    UIButton *marketButton = (UIButton*)[cell.contentView viewWithTag:4000];

    [marketButton setTag:indexPath.row];

    if([sellingArray count]>0)
    {
        if([[sellingArray objectAtIndex:indexPath.row] isEqualToString:@"0"]) // nothing
        {
            [marketButton setSelected:NO];
            [marketButton setImage:[UIImage imageNamed:@"Marketplace.png"] forState:UIControlStateNormal];
            marketButton.enabled = YES;
        }
        else if([[sellingArray objectAtIndex:indexPath.row] isEqualToString:@"2"])  // marketplace
        {
            [marketButton setSelected:YES];
            [marketButton setImage:[UIImage imageNamed:@"MarketplaceSelect.png"] forState:UIControlStateNormal];
            marketButton.enabled = YES;
        }
    }

    [market setTag:indexPath.row];

    if([priceNewArray count]> 0)
    {
        UILabel *pricelbl = (UILabel*)[cell.contentView viewWithTag:3000];

        pricelbl.text =[NSString stringWithFormat:@"$%@",[priceNewArray objectAtIndex:indexPath.row]];

        if ([sellingArray count]>0)
        {
            if([[sellingArray objectAtIndex:indexPath.row] isEqualToString:@"2"])
            {
                pricelbl.hidden = NO;
            }
            else if([[sellingArray objectAtIndex:indexPath.row] isEqualToString:@"0"])
            {
                pricelbl.hidden = YES;
            }
        }
    }
    return cell;
}

我尝试使用[tableview reloadData]，但它只重新加载UILabel，UIButton在比较它时没有改变图像。

Answer 1

您可以使用NSNotificationCenter从当前类调用其他类Method，如下面的示例： -

在ViewDidLoad方法中的MainClass中添加通知： -

- (void)viewDidLoad
{

    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(UpdateBtn:)
                                                 name:@"updateBtn"
                                               object:nil];
    [super viewDidLoad];

}

-(void)UpdateBtn:(NSNotification *)notification {

   //Update your button image code here
}

现在您只需要调用此方法从popupView类按钮单击操作以调用更新通知

 [[NSNotificationCenter defaultCenter] postNotificationName:@"updateBtn" object:self];

希望它能帮助你：）

如果点击另一个选项卡中的另一个按钮，如何更改按钮的图像

1 个答案: