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Classes/DetailViewController.h

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+//
+//  DetailViewController.h
+//  MGSplitView
+//
+//  Created by Matt Gemmell on 26/07/2010.
+//  Copyright Instinctive Code 2010.
+//
+
+#import <UIKit/UIKit.h>
+#import "MGSplitViewController.h"
+
+@interface DetailViewController : UIViewController <UIPopoverControllerDelegate, MGSplitViewControllerDelegate> {
+	IBOutlet MGSplitViewController *splitController;
+	IBOutlet UIBarButtonItem *toggleItem;
+	IBOutlet UIBarButtonItem *verticalItem;
+	IBOutlet UIBarButtonItem *dividerStyleItem;
+    UIPopoverController *popoverController;
+    UIToolbar *toolbar;
+
+    id detailItem;
+    UILabel *detailDescriptionLabel;
+}
+
+@property (nonatomic, retain) IBOutlet UIToolbar *toolbar;
+@property (nonatomic, retain) id detailItem;
+@property (nonatomic, retain) IBOutlet UILabel *detailDescriptionLabel;
+
+- (IBAction)toggleMasterView:(id)sender;
+- (IBAction)toggleVertical:(id)sender;
+- (IBAction)toggleDividerStyle:(id)sender;
+
+@end

Classes/DetailViewController.m

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+//
+//  DetailViewController.m
+//  MGSplitView
+//
+//  Created by Matt Gemmell on 26/07/2010.
+//  Copyright Instinctive Code 2010.
+//
+
+#import "DetailViewController.h"
+#import "RootViewController.h"
+
+
+@interface DetailViewController ()
+
+@property (nonatomic, retain) UIPopoverController *popoverController;
+- (void)configureView;
+
+@end
+
+
+@implementation DetailViewController
+
+
+@synthesize toolbar, popoverController, detailItem, detailDescriptionLabel;
+
+
+#pragma mark -
+#pragma mark Managing the detail item
+
+
+// When setting the detail item, update the view and dismiss the popover controller if it's showing.
+- (void)setDetailItem:(id)newDetailItem
+{
+    if (detailItem != newDetailItem) {
+        [detailItem release];
+        detailItem = [newDetailItem retain];
+
+        // Update the view.
+        [self configureView];
+    }
+
+    if (popoverController != nil) {
+        [popoverController dismissPopoverAnimated:YES];
+    }        
+}
+
+
+- (void)configureView
+{
+    // Update the user interface for the detail item.
+    detailDescriptionLabel.text = [detailItem description];
+	toggleItem.title = ([splitController isShowingMaster]) ? @"Hide Master" : @"Show Master"; // "I... AM... THE MASTER!" Derek Jacobi. Gave me chills.
+	verticalItem.title = (splitController.vertical) ? @"Horizontal Split" : @"Vertical Split";
+	dividerStyleItem.title = (splitController.dividerStyle == MGSplitViewDividerStyleThin) ? @"Enable Dragging" : @"Disable Dragging";
+}
+
+
+#pragma mark -
+#pragma mark Split view support
+
+
+- (void)splitViewController:(MGSplitViewController*)svc 
+	 willHideViewController:(UIViewController *)aViewController 
+		  withBarButtonItem:(UIBarButtonItem*)barButtonItem 
+	   forPopoverController: (UIPopoverController*)pc
+{
+	//NSLog(@"%@", NSStringFromSelector(_cmd));
+
+	if (barButtonItem) {
+		barButtonItem.title = @"Popover";
+		NSMutableArray *items = [[toolbar items] mutableCopy];
+		[items insertObject:barButtonItem atIndex:0];
+		[toolbar setItems:items animated:YES];
+		[items release];
+	}
+    self.popoverController = pc;
+}
+
+
+// Called when the view is shown again in the split view, invalidating the button and popover controller.
+- (void)splitViewController:(MGSplitViewController*)svc 
+	 willShowViewController:(UIViewController *)aViewController 
+  invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem
+{
+	//NSLog(@"%@", NSStringFromSelector(_cmd));
+
+	if (barButtonItem) {
+		NSMutableArray *items = [[toolbar items] mutableCopy];
+		[items removeObject:barButtonItem];
+		[toolbar setItems:items animated:YES];
+		[items release];
+	}
+    self.popoverController = nil;
+}
+
+
+- (void)splitViewController:(MGSplitViewController*)svc 
+		  popoverController:(UIPopoverController*)pc 
+  willPresentViewController:(UIViewController *)aViewController
+{
+	//NSLog(@"%@", NSStringFromSelector(_cmd));
+}
+
+
+- (void)splitViewController:(MGSplitViewController*)svc willChangeSplitOrientationToVertical:(BOOL)isVertical
+{
+	//NSLog(@"%@", NSStringFromSelector(_cmd));
+}
+
+
+- (void)splitViewController:(MGSplitViewController*)svc willMoveSplitToPosition:(float)position
+{
+	//NSLog(@"%@", NSStringFromSelector(_cmd));
+}
+
+
+- (float)splitViewController:(MGSplitViewController *)svc constrainSplitPosition:(float)proposedPosition splitViewSize:(CGSize)viewSize
+{
+	//NSLog(@"%@", NSStringFromSelector(_cmd));
+	return proposedPosition;
+}
+
+
+#pragma mark -
+#pragma mark Actions
+
+
+- (IBAction)toggleMasterView:(id)sender
+{
+	[splitController toggleMasterView:sender];
+	[self configureView];
+}
+
+
+- (IBAction)toggleVertical:(id)sender
+{
+	[splitController toggleSplitOrientation:self];
+	[self configureView];
+}
+
+
+- (IBAction)toggleDividerStyle:(id)sender
+{
+	MGSplitViewDividerStyle newStyle = ((splitController.dividerStyle == MGSplitViewDividerStyleThin) ? MGSplitViewDividerStylePaneSplitter : MGSplitViewDividerStyleThin);
+	[splitController setDividerStyle:newStyle animated:YES];
+	[self configureView];
+}
+
+
+#pragma mark -
+#pragma mark Rotation support
+
+
+// Ensure that the view controller supports rotation and that the split view can therefore show in both portrait and landscape.
+- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
+{
+    return YES;
+}
+
+
+- (void)didRotateFromInterfaceOrientation:(UIInterfaceOrientation)fromInterfaceOrientation
+{
+	[self configureView];
+}
+
+
+- (void)dealloc
+{
+    [popoverController release];
+    [toolbar release];
+
+    [detailItem release];
+    [detailDescriptionLabel release];
+    [super dealloc];
+}
+
+
+@end

Classes/MGSplitCornersView.h

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+//
+//  MGSplitCornersView.h
+//  MGSplitView
+//
+//  Created by Matt Gemmell on 28/07/2010.
+//  Copyright 2010 Instinctive Code.
+//
+
+#import <UIKit/UIKit.h>
+
+typedef enum _MGCornersPosition {
+	MGCornersPositionLeadingVertical	= 0, // top of screen for a left/right split.
+	MGCornersPositionTrailingVertical	= 1, // bottom of screen for a left/right split.
+	MGCornersPositionLeadingHorizontal	= 2, // left of screen for a top/bottom split.
+	MGCornersPositionTrailingHorizontal	= 3  // right of screen for a top/bottom split.
+} MGCornersPosition;
+
+@class MGSplitViewController;
+@interface MGSplitCornersView : UIView {
+	float cornerRadius;
+	MGSplitViewController *splitViewController;
+	MGCornersPosition cornersPosition;
+	UIColor *cornerBackgroundColor;
+}
+
+@property (nonatomic, assign) float cornerRadius;
+@property (nonatomic, assign) MGSplitViewController *splitViewController; // weak ref.
+@property (nonatomic, assign) MGCornersPosition cornersPosition; // don't change this manually; let the splitViewController manage it.
+@property (nonatomic, retain) UIColor *cornerBackgroundColor;
+
+@end