制作“正在播放”按钮iPhone sdk（功能）

Question

我正在制作一个有一些mp3广播电台的广播应用程序，我想在其中制作一个正在播放的按钮但是我正在努力...我要导航到我想要的视图但是当它是从那里导航标题和计时器，其他所有东西都设置为null。我能做什么？

谢谢，TC

 if (self.bookDetailViewController_1 == nil)
{
    iPhoneStreamingPlayerViewController *aBookDetail = [[iPhoneStreamingPlayerViewController alloc] initWithNibName:@"iPhoneStreamingPlayerView" bundle:nil];
    self.bookDetailViewController_1= aBookDetail;
    [aBookDetail release];
}

                [self.navigationController pushViewController:controller animated:YES];

    Music_appAppDelegate *delegate = [[UIApplication sharedApplication]delegate];
    [delegate.booksNavController pushViewController:bookDetailViewController_1 animated:YES];
    self.bookDetailViewController_1.downloadSourceField.text = [NSString stringWithFormat:@"%@",songName];



    //bookDetailViewController_1.title = [NSString stringWithFormat:@"%@",songName];

        [controller release];