CrossNavigation

if you inherit your view controllers from CNViewController, CNNavigationController, or CNTabBarController, you'll be able to push them to the stack not just to right side (as you do if you use UINavigationController), but to any of four: left, top, right, bottom. Supports autorotations.

• Auto-transitions
• Simple transitions
• Integration
• Podfile
• Requirements
• TODO
• P.S.

Auto-transitions

This type of transitions happens when a user makes dragging gesture. If you've specified a view controller (a class or a storyboad ID) for the proper direction, it will appear interactively.

Tip: You can implement this behaviour without any line of code.

In code

If you want to do this from code, assign a class of the following view controller to one of the properties:

@property (nonatomic) Class leftClass;
@property (nonatomic) Class topClass;
@property (nonatomic) Class rightClass;
@property (nonatomic) Class bottomClass;

Storyboard

You can specify all transitions in storyboard, as well.

Values are storyboard IDs of view controllers. And keys are determined in CNViewController_Storyboard.h. (Also you can set them in code.)

This approach allows users to move forward by dragging, but all the controllers must be created in the same storyboard.

Simple Transitions

In code

XXViewController *nextViewController = ...;
[self presentViewController:nextViewController direction:CNDirectionTop animated:YES];

If at least two controllers are in the stack, users can drag back to return interactively to the previous screen (like UINavigationController). Or you can do the same in code (but obviously without interactivity):

[nextViewController dismissViewControllerAnimated:YES completion:^{ ... }];

This is UIViewController's method which was overridden.

• Override

- (void)viewIsAppearing:(CGFloat)percentComplete { ... }

method in CNViewController subclass to be notified what is the current rate of a visible part of the screen. This method fires during transitions (both, interactive and noninteractive).

• Override

- (BOOL)shouldAutotransitToDirection:(CNDirection)direction present:(BOOL)present { ... }

to take a control over interactive transitions. You may allow them or prohibit depends on your app's logic. present parameter is YES if a considered transition will lead to an appearance of a new view controller in a stack. If NO, this is a back transition.

Storyboard

If you use a storyboard, you can easily create a segue between two CNViewController-s. When you drop a connection on a destination view controller, you'll see a popup with a list of available segues. bottom (CNBottomSegue), left (CNLeftSegue), right (CNRightSegue), and top (CNLeftSegue) come from CrossNavigation library, but all others are available too. You won't get a crash if you made a common modal transition from CNViewController. But you will, if you made one of those four transitions (bottom, left, right, or top) between view controllers which are not actually objects of CNViewController, CNNavigationController, or CNTabBarController class (or of it's subclasses), it's required for both controllers.

Integration

All you need is CrossNavigation directory. Just copy it to your project and import "CNViewController.h" or "CNViewController_Storyboard.h" (if you're going to use storyboard part of the functionality, as well), nothing else.

Podfile

platform :ios, '7.0'
pod "CrossNavigation"

Requirements

• iOS 7.0+
• UIKit framework
• Foundation framework

TODO

• Support partial screen transitions (like a side screen)
• Port the library to Swift (thanks to Nicolas Purita)
• Segues support

P.S.

I'm really interested to know, what do you think about this library. If you have a complaint, a suggestion, or a question, please, send it on my e-mail: artem.stepanenko.1@gmail.com. Thank you.