How to rotate view to landscape mode in block-based animation

My application contains a Tab Bar Controller and Navigation controller. Its totally in Portrait mode. Now I have a table view in 2nd tab, clicking on each row of table view will push another view controller which will show a graphical chart, now I want this chart to be in landscape mode where as the rest of application is in portrait mode.

I came to know that we have to rotate the view on our own, now my question is how to rotate this new view in landscape mode. I put some UIView ani开发者_运维技巧mations in viewWillAppear function, but I want the block-based animation to rotate this view to landscape for me and when I go back it rotate back portrait mode.

Thanks in advance !

Check the device orientation and make the rotation depends on it:

[UIView animateWithDuration:0.5f animations:^{ myView.transform = CGAffineTransformMakeRotation(-M_PI * 0.5); } ];