Moving from portrait view to Landscape view / Potrait UI orientation to landscape Ui orienttion in Phone iOS / Ui Orientation according to device Orientation / manually forcing orientation / change orientation manually

When u are switching from one view to another view .

First view is Portrait mode and next mode is in Landscape mode . 

Even u have implemented

-(BOOL)shouldAutorotate;

-(NSUInteger)supportedInterfaceOrientations;

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation duration:(NSTimeInterval)duration;

USe 

+ (void)attemptRotationToDeviceOrientation

Attempts to rotate all windows to the orientation of the device.

-(void) viewDidAppear:(BOOL)animated

{

    [UIViewController attemptRotationToDeviceOrientation];

    [super viewDidAppear:animated];

}