6.0以前用下面的这种方式

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation

{

    return (toInterfaceOrientation != UIInterfaceOrientationMaskPortraitUpsideDown);

}

6.0以后要追加一下方式

- (BOOL)shouldAutorotate

{

    return YES;

}

- (NSUInteger)supportedInterfaceOrientations

{

    return UIInterfaceOrientationMaskAllButUpsideDown;

}

 

UIInterfaceOrientationMaskLandscape  支持左右横屏

UIInterfaceOrientationMaskAll  支持四个方向旋转

UIInterfaceOrientationMaskAllButUpsideDown 支持除了UpsideDown以外的旋转

UIInterfaceOrientationPortrait 竖屏正常显示