Iphone 导航栏按钮在设备定向期间移动几秒钟

在我的导航栏中，我有一个左按钮和一个右按钮。在进行设备定位时，这些按钮项目会在几秒钟内朝向标题视图，然后返回到结束位置。此重新定位的任何解决方案。 提前谢谢

UIBarButtonItem *btLeftItem = [[UIBarButtonItem alloc] initWithCustomView:segNav];
[segNav release];

UIBarButtonItem *btRightItem = [[UIBarButtonItem alloc] initWithCustomView:segRight];
[segRight release];

//segNav and segRight are UISegmentedControl objects

navItem = [[UINavigationItem alloc] init];
[navItem setRightBarButtonItem:btRightItem]; //set left button for navigation item
[navItem setLeftBarButtonItem:btLeftItem];   //set right button for navigation item

[navItem setTitleView:titleLab]; //set navigation item title view

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你能分享一下代码吗？？。否则很难解决问题