Portrait to Landscape Orientation

Portrait to Landscape Orientation 

Step 1 
in AppDelegate.h

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;

@property(nonatomic) BOOL shouldRotate;

@end

in AppDelegate.m

-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{

    if (self.shouldRotate)

        return UIInterfaceOrientationMaskAllButUpsideDown;

    else

        return UIInterfaceOrientationMaskPortrait;

}

Step 2 

#import "ViewController.h"

#import "LandscapeView.h"

-(IBAction)onNext:(id)sender

{

    UIStoryboard *story = [UIStoryboard storyboardWithName:@"Main" bundle:nil];

    

    LandscapeView *temp = [story instantiateViewControllerWithIdentifier:@"Landscapeid"];

    [self presentViewController:temp animated:YES completion:nil];

}

Step 3

LandscapeView.h

#import <UIKit/UIKit.h>

#import "AppDelegate.h"

@interface LandscapeView : UIViewController

{

    AppDelegate *appDelegate;

}

@end

LandscapeView.m

#import "LandscapeView.h"

@interface LandscapeView ()

@end

@implementation LandscapeView

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    

    appDelegate = (AppDelegate *) [[UIApplication sharedApplication]delegate];

    [appDelegate setShouldRotate:YES];

}

-(IBAction)onBack:(id)sender{

    [appDelegate setShouldRotate:NO];

    [self dismissViewControllerAnimated:YES completion:nil];

}

-(BOOL)shouldAutorotate{

    return NO;

}

- (UIInterfaceOrientationMask)supportedInterfaceOrientations {

     return (UIInterfaceOrientationMaskLandscapeLeft);

}

@end