[英]How can I change the image of a button when tapping on another button in another tab
我有一个UITabBarController
,它具有3个选项卡(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,我希望用户单击tab2上的任何按钮,并且tab1中的按钮应该已更改图像。 我可以在tab1中获得按钮的标签,但是当单击tab2中的按钮时,我不知道如何在tab1中获得按钮的标签。 我怎样才能做到这一点?
非常感谢。
这是我在tab1中创建tableview的代码:
- (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],但它仅重新加载UILabel,当我比较它们时,UIButton不会更改图像。
您可以使用NSNotificationCenter
从当前类中调用其他类Method,例如下面的示例:-
在您的ViewDidLoad
方法中的ViewDidLoad
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即可。从popupView
类的Button中,单击“用于调用更新通知的操作”。
[[NSNotificationCenter defaultCenter] postNotificationName:@"updateBtn" object:self];
希望对您有帮助:)
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