view.frame在ipad中不起作用？

I am developing iPad application in landscape mode.I have set in all view controller as return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);. but when I give change view frame through following code,it is not changing , it occupies full screen of ipad.How can i overcome this problem , any help please?I tried view.frame also.I am developing iPad application in landscape m