#define MG_DEFAULT_SPLIT_POSITION       320.0   // default width of master view in UISplitViewController.

#define MG_DEFAULT_SPLIT_WIDTH          1.0     // default width of split-gutter in UISplitViewController.

#define MG_DEFAULT_CORNER_RADIUS        5.0     // default corner-radius of overlapping split-inner corners on the master and detail views.

#define MG_DEFAULT_CORNER_COLOR         [UIColor blackColor]    // default color of intruding inner corners (and divider background).

#define MG_PANESPLITTER_CORNER_RADIUS   0.0     // corner-radius of split-inner corners for MGSplitViewDividerStylePaneSplitter style.

#define MG_PANESPLITTER_SPLIT_WIDTH     25.0    // width of split-gutter for MGSplitViewDividerStylePaneSplitter style.

#define MG_MIN_VIEW_WIDTH               200.0   // minimum width a view is allowed to become as a result of changing the splitPosition.

#define MG_ANIMATION_CHANGE_SPLIT_ORIENTATION   @"ChangeSplitOrientation"   // Animation ID for internal use.

#define MG_ANIMATION_CHANGE_SUBVIEWS_ORDER      @"ChangeSubviewsOrder"  // Animation ID for internal use.

    NSString *orientationName = nil;

    switch (theOrientation) {

        case UIInterfaceOrientationPortrait:

            orientationName = @"Portrait"; // Home button at bottom

            break;

        case UIInterfaceOrientationPortraitUpsideDown:

            orientationName = @"Portrait (Upside Down)"; // Home button at top

            break;

        case UIInterfaceOrientationLandscapeLeft:

            orientationName = @"Landscape (Left)"; // Home button on left

            break;

        case UIInterfaceOrientationLandscapeRight:

            orientationName = @"Landscape (Right)"; // Home button on right

            break;

        default:

            break;

    }

    return orientationName;

    return UIInterfaceOrientationIsLandscape(self.interfaceOrientation);

    // Returns YES if master view should be shown directly embedded in the splitview, instead of hidden in a popover.

    return ((UIInterfaceOrientationIsLandscape(theOrientation)) ? _showsMasterInLandscape : _showsMasterInPortrait);

    return [self shouldShowMasterForInterfaceOrientation:self.interfaceOrientation];

    return [self shouldShowMaster] && self.masterViewController && self.masterViewController.view && ([self.masterViewController.view superview] == self.view);

    if ((self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil])) {

        [self setup];

    }

    return self;

    if ((self = [super initWithCoder:aDecoder])) {

        [self setup];

    }

    return self;

    // Configure default behaviour.

    _viewControllers = [[NSMutableArray alloc] initWithObjects:[NSNull null], [NSNull null], nil];

    _splitWidth = MG_DEFAULT_SPLIT_WIDTH;

    _showsMasterInPortrait = NO;

    _showsMasterInLandscape = YES;

    _reconfigurePopup = NO;

    _vertical = YES;

    _masterBeforeDetail = YES;

    _splitPosition = MG_DEFAULT_SPLIT_POSITION;

    CGRect divRect = self.view.bounds;

    if ([self isVertical]) {

        divRect.origin.y = _splitPosition;

        divRect.size.height = _splitWidth;

    } else {

        divRect.origin.x = _splitPosition;

        divRect.size.width = _splitWidth;

    }

    _dividerView = [[MGSplitDividerView alloc] initWithFrame:divRect];

    _dividerView.splitViewController = self;

    _dividerView.backgroundColor = MG_DEFAULT_CORNER_COLOR;

    _dividerStyle = MGSplitViewDividerStyleThin;

    _delegate = nil;

    [self.view.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];

    [_viewControllers release];

    [_barButtonItem release];

    [_hiddenPopoverController release];

    [_dividerView release];

    [_cornerViews release];

    [super dealloc];

    [self.masterViewController willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];

    [self.detailViewController willRotateToInterfaceOrientation:toInterfaceOrientation duration:duration];

    [self.masterViewController didRotateFromInterfaceOrientation:fromInterfaceOrientation];

    [self.detailViewController didRotateFromInterfaceOrientation:fromInterfaceOrientation];

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation

                                         duration:(NSTimeInterval)duration

    [self.masterViewController willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];

    [self.detailViewController willAnimateRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];

    // Hide popover.

    if (_hiddenPopoverController && _hiddenPopoverController.popoverVisible) {

        [_hiddenPopoverController dismissPopoverAnimated:NO];

    }

    // Re-tile views.

    _reconfigurePopup = YES;

    [self layoutSubviewsForInterfaceOrientation:toInterfaceOrientation withAnimation:YES];

    [self.masterViewController willAnimateFirstHalfOfRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];

    [self.detailViewController willAnimateFirstHalfOfRotationToInterfaceOrientation:toInterfaceOrientation duration:duration];

    [self.masterViewController didAnimateFirstHalfOfRotationToInterfaceOrientation:toInterfaceOrientation];

    [self.detailViewController didAnimateFirstHalfOfRotationToInterfaceOrientation:toInterfaceOrientation];

    [self.masterViewController willAnimateSecondHalfOfRotationFromInterfaceOrientation:fromInterfaceOrientation duration:duration];

    [self.detailViewController willAnimateSecondHalfOfRotationFromInterfaceOrientation:fromInterfaceOrientation duration:duration];

    UIScreen *screen = [UIScreen mainScreen];

    CGRect fullScreenRect = screen.bounds; // always implicitly in Portrait orientation.

    CGRect appFrame = screen.applicationFrame;

    // Find status bar height by checking which dimension of the applicationFrame is narrower than screen bounds.

    // Little bit ugly looking, but it'll still work even if they change the status bar height in future.

    float statusBarHeight = MAX((fullScreenRect.size.width - appFrame.size.width), (fullScreenRect.size.height - appFrame.size.height));

    // Initially assume portrait orientation.

    float width = fullScreenRect.size.width;

    float height = fullScreenRect.size.height;

    // Correct for orientation.

    if (UIInterfaceOrientationIsLandscape(theOrientation)) {

        width = height;

        height = fullScreenRect.size.width;

    }

    // Account for status bar, which always subtracts from the height (since it's always at the top of the screen).

    height -= statusBarHeight;

    return CGSizeMake(width, height);

    if (_reconfigurePopup) {

        [self reconfigureForMasterInPopover:![self shouldShowMasterForInterfaceOrientation:theOrientation]];

    }

    // Layout the master, detail and divider views appropriately, adding/removing subviews as needed.

    // First obtain relevant geometry.

    CGSize fullSize = [self splitViewSizeForOrientation:theOrientation];

    float width = fullSize.width;

    float height = fullSize.height;

    if (NO) { // Just for debugging.

        NSLog(@"Target orientation is %@, dimensions will be %.0f x %.0f",

              [self nameOfInterfaceOrientation:theOrientation], width, height);

    }

    // Layout the master, divider and detail views.

    CGRect newFrame = CGRectMake(0, 0, width, height);

    UIViewController *controller;

    UIView *theView;

    BOOL shouldShowMaster = [self shouldShowMasterForInterfaceOrientation:theOrientation];

    BOOL masterFirst = [self isMasterBeforeDetail];

    if ([self isVertical]) {

        // Master on left, detail on right (or vice versa).

        CGRect masterRect, dividerRect, detailRect;

        if (masterFirst) {

            if (!shouldShowMaster) {

                // Move off-screen.

                newFrame.origin.x -= (_splitPosition + _splitWidth);

            }

            newFrame.size.width = _splitPosition;

            masterRect = newFrame;

            newFrame.origin.x += newFrame.size.width;

            newFrame.size.width = _splitWidth;

            dividerRect = newFrame;

            newFrame.origin.x += newFrame.size.width;

            newFrame.size.width = width - newFrame.origin.x;

            detailRect = newFrame;

        } else {

            if (!shouldShowMaster) {

                // Move off-screen.

                newFrame.size.width += (_splitPosition + _splitWidth);

            }

            newFrame.size.width -= (_splitPosition + _splitWidth);

            detailRect = newFrame;

            newFrame.origin.x += newFrame.size.width;

            newFrame.size.width = _splitWidth;

            dividerRect = newFrame;

            newFrame.origin.x += newFrame.size.width;

            newFrame.size.width = _splitPosition;

            masterRect = newFrame;

        }

        // Position master.

        controller = self.masterViewController;

        if (controller && [controller isKindOfClass:[UIViewController class]])  {

            theView = controller.view;

            if (theView) {

                theView.frame = masterRect;

                if (!theView.superview) {

                    [controller viewWillAppear:NO];

                    [self.view addSubview:theView];

                    [controller viewDidAppear:NO];

                }

            }

        }

        // Position divider.

        theView = _dividerView;

        theView.frame = dividerRect;

        if (!theView.superview) {

            [self.view addSubview:theView];

        }

        // Position detail.

        controller = self.detailViewController;

        if (controller && [controller isKindOfClass:[UIViewController class]])  {

            theView = controller.view;

            if (theView) {

                theView.frame = detailRect;

                if (!theView.superview) {

                    [self.view insertSubview:theView aboveSubview:self.masterViewController.view];

                } else {

                    [self.view bringSubviewToFront:theView];

                }

            }

        }

    } else {

        // Master above, detail below (or vice versa).

        CGRect masterRect, dividerRect, detailRect;

        if (masterFirst) {

            if (!shouldShowMaster) {

                // Move off-screen.

                newFrame.origin.y -= (_splitPosition + _splitWidth);

            }

            newFrame.size.height = _splitPosition;

            masterRect = newFrame;

            newFrame.origin.y += newFrame.size.height;

            newFrame.size.height = _splitWidth;

            dividerRect = newFrame;

            newFrame.origin.y += newFrame.size.height;

            newFrame.size.height = height - newFrame.origin.y;

            detailRect = newFrame;

        } else {

            if (!shouldShowMaster) {

                // Move off-screen.

                newFrame.size.height += (_splitPosition + _splitWidth);

            }

            newFrame.size.height -= (_splitPosition + _splitWidth);

            detailRect = newFrame;

            newFrame.origin.y += newFrame.size.height;

            newFrame.size.height = _splitWidth;

            dividerRect = newFrame;

            newFrame.origin.y += newFrame.size.height;

            newFrame.size.height = _splitPosition;

            masterRect = newFrame;

        }

        // Position master.

        controller = self.masterViewController;

        if (controller && [controller isKindOfClass:[UIViewController class]])  {

            theView = controller.view;

            if (theView) {

                theView.frame = masterRect;

                if (!theView.superview) {

                    [controller viewWillAppear:NO];

                    [self.view addSubview:theView];

                    [controller viewDidAppear:NO];

                }

            }

        }

        // Position divider.

        theView = _dividerView;

        theView.frame = dividerRect;

        if (!theView.superview) {

            [self.view addSubview:theView];

        }

        // Position detail.

        controller = self.detailViewController;

        if (controller && [controller isKindOfClass:[UIViewController class]])  {

            theView = controller.view;

            if (theView) {

                theView.frame = detailRect;

                if (!theView.superview) {

                    [self.view insertSubview:theView aboveSubview:self.masterViewController.view];

                } else {

                    [self.view bringSubviewToFront:theView];

                }

            }

        }

    }

    // Create corner views if necessary.

    MGSplitCornersView *leadingCorners; // top/left of screen in vertical/horizontal split.

    MGSplitCornersView *trailingCorners; // bottom/right of screen in vertical/horizontal split.

    if (!_cornerViews) {

        CGRect cornerRect = CGRectMake(0, 0, 10, 10); // arbitrary, will be resized below.

        leadingCorners = [[MGSplitCornersView alloc] initWithFrame:cornerRect];

        leadingCorners.splitViewController = self;

        leadingCorners.cornerBackgroundColor = MG_DEFAULT_CORNER_COLOR;

        leadingCorners.cornerRadius = MG_DEFAULT_CORNER_RADIUS;

        trailingCorners = [[MGSplitCornersView alloc] initWithFrame:cornerRect];

        trailingCorners.splitViewController = self;

        trailingCorners.cornerBackgroundColor = MG_DEFAULT_CORNER_COLOR;

        trailingCorners.cornerRadius = MG_DEFAULT_CORNER_RADIUS;

        _cornerViews = [[NSArray alloc] initWithObjects:leadingCorners, trailingCorners, nil];

        [leadingCorners release];

        [trailingCorners release];

    } else if ([_cornerViews count] == 2) {

        leadingCorners = [_cornerViews objectAtIndex:0];

        trailingCorners = [_cornerViews objectAtIndex:1];

    }

    // Configure and layout the corner-views.

    leadingCorners.cornersPosition = (_vertical) ? MGCornersPositionLeadingVertical : MGCornersPositionLeadingHorizontal;

    trailingCorners.cornersPosition = (_vertical) ? MGCornersPositionTrailingVertical : MGCornersPositionTrailingHorizontal;

    leadingCorners.autoresizingMask = (_vertical) ? UIViewAutoresizingFlexibleBottomMargin : UIViewAutoresizingFlexibleRightMargin;

    trailingCorners.autoresizingMask = (_vertical) ? UIViewAutoresizingFlexibleTopMargin : UIViewAutoresizingFlexibleLeftMargin;

    float x, y, cornersWidth, cornersHeight;

    CGRect leadingRect, trailingRect;

    float radius = leadingCorners.cornerRadius;

    if (_vertical) { // left/right split

        cornersWidth = (radius * 2.0) + _splitWidth;

        cornersHeight = radius;

        x = ((shouldShowMaster) ? ((masterFirst) ? _splitPosition : width - (_splitPosition + _splitWidth)) : (0 - _splitWidth)) - radius;

        y = 0;

        leadingRect = CGRectMake(x, y, cornersWidth, cornersHeight); // top corners

        trailingRect = CGRectMake(x, (height - cornersHeight), cornersWidth, cornersHeight); // bottom corners

    } else { // top/bottom split

        x = 0;

        y = ((shouldShowMaster) ? ((masterFirst) ? _splitPosition : height - (_splitPosition + _splitWidth)) : (0 - _splitWidth)) - radius;

        cornersWidth = radius;

        cornersHeight = (radius * 2.0) + _splitWidth;

        leadingRect = CGRectMake(x, y, cornersWidth, cornersHeight); // left corners

        trailingRect = CGRectMake((width - cornersWidth), y, cornersWidth, cornersHeight); // right corners

    }

    leadingCorners.frame = leadingRect;

    trailingCorners.frame = trailingRect;

    // Ensure corners are visible and frontmost.

    if (!leadingCorners.superview) {

        [self.view insertSubview:leadingCorners aboveSubview:self.detailViewController.view];

        [self.view insertSubview:trailingCorners aboveSubview:self.detailViewController.view];

    } else {

        [self.view bringSubviewToFront:leadingCorners];

        [self.view bringSubviewToFront:trailingCorners];

    }

    [self layoutSubviewsForInterfaceOrientation:self.interfaceOrientation withAnimation:animate];

    [self layoutSubviewsForInterfaceOrientation:self.interfaceOrientation withAnimation:YES];

    [super viewWillAppear:animated];

    if ([self isShowingMaster]) {

        [self.masterViewController viewWillAppear:animated];

    }

    [self.detailViewController viewWillAppear:animated];