-(void)setViewOrientation:(UIInterfaceOrientation )orientation

{

    if ([[UIDevice currentDevice] respondsToSelector:@selector(setOrientation:)]) {

        [[UIDevice currentDevice] performSelector:@selector(setOrientation:)

                                       withObject:(id)orientation];

    }

    [UIViewController attemptRotationToDeviceOrientation];//这句是关键

}

-(NSUInteger)supportedInterfaceOrientations

{

    return UIInterfaceOrientationMaskPortrait;

}

-(BOOL)shouldAutorotate

{

    return YES;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation

{

    return toInterfaceOrientation==UIInterfaceOrientationPortrait;

}

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear :YES];

    [self setViewOrientation:UIInterfaceOrientationLandscapeRight];

}
//重写下面子类的方法

- (NSUInteger) supportedInterfaceOrientations{

returnUIInterfaceOrientationMaskLandscapeRight;

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation NS_DEPRECATED_IOS(2_0, 6_0){

return toInterfaceOrientation == UIInterfaceOrientationLandscapeRight;

}