如何告诉即将到来的viewController被哪个按钮调用

blaVC

blubbVC

blubbVC

blaVC

blubbVC

- (IBAction) buttonA:(id)sender {
blubbVC *detailView = [[blubbVC alloc] initWithNibName:@\"blubbNib\" bundle:nil];
[self.navigationController pushViewController:detailView animated:YES];
[detailView release];
}

sender

initWithNibName

sender

[detailView setupContent:(id)sender];

- (IBAction) buttonA:(id)sender {
    blubbVC *detailView = [[blubbVC alloc] initWithNibName:@\"blubbNib\" bundle:nil];
    [detailView setupContent:sender];
    [self.navigationController pushViewController:detailView animated:YES];
    [detailView release];
}

-[initWithNibName: andSender:]

[super initWithNibName:]

+(id)initWithCaller:(NSString*)caller
{
    if(self == [super initWithNibName:@\"blubbNib\" bundle:nil]) 
    {
      calledFrom = x;
    }
    return self;
}