bdunagan

fill the void - bdunagan

14 Dec 2011
Modal views in universal iOS apps

On the iPhone, it’s quite normal to have an app slide a sheet up to create something or change settings. But on the iPad, that same view should be displayed in a popover. In a universal app, the key is shared code and XIBs for both approaches.

The code below is all that I needed to have a Settings sheet appear correctly in both an iPhone and iPad app. I simply identify the device type and then either present a popover controller or a modal view controller, using the same XIB. Clean code. Consistent interface.

// Main View Controller
- (IBAction)showSheet:(id)sender {
	if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPad) {
		// iPad
		if (!self.popoverController.popoverVisible) {
			self.popoverController = [[[UIPopoverController alloc] initWithContentViewController:self.myNavigationController] autorelease];
			self.popoverController.popoverContentSize = CGSizeMake(400, 400);
			self.popoverController.contentViewController.contentSizeForViewInPopover = CGSizeMake(400, 400);
			self.popoverController.delegate = self;
			// Present the popover from the bar button.
			[self.popoverController presentPopoverFromBarButtonItem:self.navigationItem.rightBarButtonItem permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
		}
	}
	else {
		// iPhone
		[self.navigationController presentModalViewController:self.myNavigationController animated:YES];
	}
}

- (void)popoverControllerDidDismissPopover:(UIPopoverController *)aPopoverController {
	[self.popoverController dismissPopoverAnimated:YES];
}

- (MyNavigationController *)myNavigationController {
	if (myNavigationController == nil) {
		self.myNavigationController = [[UINavigationController alloc] initWithRootViewController:self.mySheetController] autorelease];
	}
	return myNavigationController;
}

- (MySheetController *)mySheetController {
	if (mySheetController == nil) {
		self.mySheetController = [[MySheetController alloc] initWithNibName:@"MySheetView" bundle:nil] autorelease];
	}
	return mySheetController;
}

// Sheet View Controller
- (void)viewWillAppear:(BOOL)animated {
	self.contentSizeForViewInPopover = CGMakeSize(400, 400);
	[super viewWillAppear:animated];
}
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