/*

     File: ViewController.m

 Abstract: A view controller with different views for portrait and landscape

 orientations.

  Version: 1.3

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 */

#import "ViewController.h"

#import "PortraitView.h"

#import "LandscapeView.h"

@interface ViewController ()

//! The view to use while in portrait orientation.  This property is configured

//! to be strong because the view it references may not always be in the view

//! hierarchy.

@property (nonatomic, strong) IBOutlet PortraitView *portraitView;

//! The view to use while in landscape orientation.  This property is configured

//! to be strong because the view it references may not always be in the view

//! hierarchy.

@property (nonatomic, strong) IBOutlet LandscapeView *landscapeView;

@end

@implementation ViewController

{

    //! Holds a snapshot of the outgoing view used duration rotation,

    //! to smooth out the transition animation.

    __weak UIView *_rotationSnapshotView;

}

//| ----------------------------------------------------------------------------

//  Our view only serves as a container for the orientation-specific views.

//  If you remove this method, subviews added to the view for this view

//  controller's scene in the storyboard will be visible in both orientations.

//

- (void)loadView

{

    self.view = [[UIView alloc] init];

}

//| ----------------------------------------------------------------------------

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

    // Display the correct view for the current interface orientation.

    // This is done here instead of in -viewDidLoad because the value of

    // interfaceOrientation is not final when -viewDidLoad called.

    {

        UIView *viewForCurrentInterfaceOrientation = [self viewForInterfaceOrientation:self.interfaceOrientation];

        if (viewForCurrentInterfaceOrientation.superview == nil)

        {

            [self.portraitView removeFromSuperview];

            [self.landscapeView removeFromSuperview];

            [self.view addSubview:viewForCurrentInterfaceOrientation];

            [self.view sendSubviewToBack:viewForCurrentInterfaceOrientation];

        }

    }

    // If you've created separate UIView subclasses for your portrait and

    // landscape interfaces, then you should perform and orientation specific

    // setup in the -willMoveToSuperview: method of each respective subclass

    // instead of here.

}

//| ----------------------------------------------------------------------------

- (void)viewWillLayoutSubviews

{

    [super viewWillLayoutSubviews];

    // Match the orientation-specific view's frame to our view's frame.

    // It's easier to update both here instead of checking which one is

    // actually in use at the current time.

    self.portraitView.frame = self.view.bounds;

    self.landscapeView.frame = self.view.bounds;

    // Forward the current values of  self.topLayoutGuide and

    // self.bottomLayoutGuide to the orientation-specific views.

    // (See the comments in LayoutSupport.h for more information)

    // It's easier to update both here instead of checking which one is

    // actually in use at the current time.

    if ([self respondsToSelector:@selector(topLayoutGuide)])

    {

        self.portraitView.topLayoutGuideLength = self.topLayoutGuide.length;

        self.landscapeView.topLayoutGuideLength = self.topLayoutGuide.length;

        self.portraitView.bottomLayoutGuideLength = self.bottomLayoutGuide.length;

        self.landscapeView.bottomLayoutGuideLength = self.bottomLayoutGuide.length;

    }

    // iOS 6 does not have topLayoutGuide and bottomLayoutGuide.

    else

    {

        self.portraitView.topLayoutGuideLength = 0;

        self.landscapeView.topLayoutGuideLength = 0;

        self.portraitView.bottomLayoutGuideLength = 0;

        self.landscapeView.bottomLayoutGuideLength = 0;

    }

}

#pragma mark -

#pragma mark Rotation

//| ----------------------------------------------------------------------------

//  This method is called before

//      a) The system configures transaction to animate the rotation (changes

//         made here won't be animated)

//      b) The system resizes the window's root view for the new orientation.

//

- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration

{

    [super willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];

    UIView *viewForCurrentInterfaceOrientation = [self viewForInterfaceOrientation:self.interfaceOrientation];

    UIView *viewForFinalInterfaceOrientation = [self viewForInterfaceOrientation:toInterfaceOrientation];

    // Ignore rotating from Landscape-Left to Landscape-Right or vis-versa.

    if (viewForCurrentInterfaceOrientation != viewForFinalInterfaceOrientation)

    {

        // Don't let an orientation-specific view ever be resized for the

        // orientation it does not support.  Instead, a snapshot of the

        // outgoing view is swapped in before the rotation animation

        // begins.  The snapshot will be stretched (or squished) to match our

        // view's changing frame .

        UIView *rotationSnapshotView;

        if ([viewForCurrentInterfaceOrientation respondsToSelector:@selector(snapshotViewAfterScreenUpdates:)])

        // iOS 7

        {

            rotationSnapshotView = [viewForCurrentInterfaceOrientation snapshotViewAfterScreenUpdates:NO];

        }

        else

        // iOS 6

        {

            UIGraphicsBeginImageContextWithOptions(viewForCurrentInterfaceOrientation.bounds.size, YES, viewForCurrentInterfaceOrientation.layer.contentsScale);

            [[viewForCurrentInterfaceOrientation layer] renderInContext:UIGraphicsGetCurrentContext()];

            UIImage *snapshot = UIGraphicsGetImageFromCurrentImageContext();

            UIGraphicsEndImageContext();

            rotationSnapshotView = [[UIImageView alloc] initWithImage:snapshot];

        }

        rotationSnapshotView.frame = viewForCurrentInterfaceOrientation.frame;

        rotationSnapshotView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;

        [self.view insertSubview:rotationSnapshotView aboveSubview:viewForCurrentInterfaceOrientation];

        // Save the snapshot view so it can be removed when the animation

        // completes.

        _rotationSnapshotView = rotationSnapshotView;

        // Now that the sanpshot is in place, remove the outgoing view.

        [viewForCurrentInterfaceOrientation removeFromSuperview];

    }

    if (viewForFinalInterfaceOrientation.superview == nil)

    {

        [self.view addSubview:viewForFinalInterfaceOrientation];

        [self.view sendSubviewToBack:viewForFinalInterfaceOrientation];

        // We're going to fade the incoming view in.

        viewForFinalInterfaceOrientation.alpha = 0.0f;

    }

}

//| ----------------------------------------------------------------------------

//  By the time this method is called

//      a) The system has opened (but not committed) a transaction to

//         animate the rotation.

//      b) The system has resized the root view from the new orientation.

//      c) -viewWillLayoutSubviews has been called.

//

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration

{

    [super willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];

    // Snapshot fades out, incoming view fades in.

    // You don't need to setup your own animation transaction here, one

    // has already been setup by the system.

    _rotationSnapshotView.alpha = 0.0f;

    [self viewForInterfaceOrientation:toInterfaceOrientation].alpha = 1.0f;

}

//| ----------------------------------------------------------------------------

- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation

{

    [super didRotateFromInterfaceOrientation:fromInterfaceOrientation];

    [_rotationSnapshotView removeFromSuperview];

}

#pragma mark -

#pragma mark Utility

//| ----------------------------------------------------------------------------

//! Lazily loads and returns the view of the give \a interfaceOrientation.

//

- (UIView*)viewForInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

    if (UIInterfaceOrientationIsLandscape(interfaceOrientation))

    {

        // Lazily load landscapeView if necessary.

        if (self.landscapeView == nil)

        {

            // Will automatically load LandscapeView~ipad if run on an iPad.

            UINib *landscapeViewXib = [UINib nibWithNibName:@"LandscapeView" bundle:nil];

            // In the LandscapeView xib the "File's Owner" has been set to

            // ViewController and the landscapeView IBOutlet of the file's owner

            // has been connected to the view defined within the xib.  Thus upon

            // instantiation, the unarchived view will be automatically connected

            // to the landscapeView of self.

            [landscapeViewXib instantiateWithOwner:self options:nil];

        }

        return self.landscapeView;

    }

    else

    {

        // Lazily load portraitView if necessary.

        if (self.portraitView == nil)

        {

            // Will automatically load PortraitView~ipad if run on an iPad.

            UINib *portraitViewXib = [UINib nibWithNibName:@"PortraitView" bundle:nil];

            // In the PortraitView xib the "File's Owner" has been set to

            // ViewController and the portraitView IBOutlet of the file's owner

            // has been connected to the view defined within the xib.  Thus upon

            // instantiation, the unarchived view will be automatically connected

            // to the portraitView of self.

            [portraitViewXib instantiateWithOwner:self options:nil];

        }

        return self.portraitView;

    }

}

@end