Custom Containers and Custom Transitions - ios

Question

Custom transitions work easily with standard containers and while presenting modal view controllers. But what about using custom transitions with a totally custom container?
I'd like to use the UIViewControllerContextTransitioning protocol with my custom container and take advantage of transitioning and interactive transitions.
In the comment into the header file of UIViewControllerContextTransitioning I read:
// The UIViewControllerContextTransitioning protocol can be adopted by custom
// container controllers. It is purposely general to cover more complex
// transitions than the system currently supports.
but I can't understand how to create a Context Transitioning and start all the custom transition process.

Answer 1

This is very well possible!
have a look at this SO Answer.
You just have to create a viewController conforming to the UIViewControllerContextTransitioning protocol and use the ViewController Containment API (addChildViewController:, willMoveToParentViewController:, and so on).
When you want to start the custom transition, simply call the [animateTransition] Method on your transitionController. From that point on, it's the same as with the Apple-provided API.
Make your custom container fit in with the Transitioning API.
In fact, all the new protocols introduced in iOS7 (UIViewControllerContextTransitioning and so on) are not really needed to implement your own fully custom containerViewController. Its just providing a neat class-relationship and method pool. But you could write that all by yourself and would not need to use any private API.
ViewController Containment (introduced in iOS5) is all you need for this job.
I just tried gave it a try and its even working with interactive transitions.
If you need some sample code please let me know and i'll provide some :)
EDIT
By the way, this is how Facebook and Instagram for iOS is creating their navigation concept. You can scroll away the NavigationBar in these Apps and when a new ViewController is "pushed" the NavigationBar seems to have been reset during the pushing.
Ironically, i asked the exact same question a month ago here on StackOverflow :D
My Question
And I just realized i answered it myself :)
Have a nice day !

Answer 2

In fact, it says so but you are incomplete:
The UIViewControllerContextTransitioning protocol can be adopted by
custom container controllers. It is purposely general to cover
more complex transitions than the system currently supports. For
now, navigation push/pops and UIViewController present/dismiss
transitions can be customized.
That means you can trigger your VC's transitioningDelegate by calling presentViewController:animated:completion: method or you can implement navigationController:animationControllerForOperation:fromViewController:toViewController: in your UINavigationControllerDelegate class and return an object that conforms UIViewControllerAnimatedTransitioning protocol.
To sum up, there are only two ways to provide custom transition. Both requires presenting/pushing a VC while we add subviews to create custom container view controllers.
Probably, Apple will do what they said in the first lines of their statement in header file in the future, but for now what you want to do seems impossible.

Answer 3

From docs UIViewControllerContextTransitioning
Do not adopt this protocol in your own classes, nor should you
directly create objects that adopt this protocol.

Answer 4

Please look at MPFoldTransition, it worked for me.
You can also use the following Category, you can create your own transition using this.
#import <UIKit/UIKit.h>
#interface UIView (Animation)
- (void) moveTo:(CGPoint)destination duration:(float)secs option:(UIViewAnimationOptions)option;
- (void) downUnder:(float)secs option:(UIViewAnimationOptions)option;
- (void) addSubviewWithZoomInAnimation:(UIView*)view duration:(float)secs option:(UIViewAnimationOptions)option;
- (void) removeWithZoomOutAnimation:(float)secs option:(UIViewAnimationOptions)option;
- (void) addSubviewWithFadeAnimation:(UIView*)view duration:(float)secs option:(UIViewAnimationOptions)option;
- (void) removeWithSinkAnimation:(int)steps;
- (void) removeWithSinkAnimationRotateTimer:(NSTimer*) timer;
#end
Implementation :
#import "UIView+Animation.h"
#implementation UIView (Animation)
- (void) moveTo:(CGPoint)destination duration:(float)secs option:(UIViewAnimationOptions)option
{
[UIView animateWithDuration:secs delay:0.0 options:option
animations:^{
self.frame = CGRectMake(destination.x,destination.y, self.frame.size.width, self.frame.size.height);
}
completion:nil];
}
- (void) downUnder:(float)secs option:(UIViewAnimationOptions)option
{
[UIView animateWithDuration:secs delay:0.0 options:option
animations:^{
self.transform = CGAffineTransformRotate(self.transform, M_PI);
self.alpha = self.alpha - 0.5;
}
completion:nil];
}
- (void) addSubviewWithZoomInAnimation:(UIView*)view duration:(float)secs option:(UIViewAnimationOptions)option
{
// first reduce the view to 1/100th of its original dimension
CGAffineTransform trans = CGAffineTransformScale(view.transform, 0.01, 0.01);
view.transform = trans; // do it instantly, no animation
[self addSubview:view];
// now return the view to normal dimension, animating this tranformation
[UIView animateWithDuration:secs delay:0.0 options:option
animations:^{
view.transform = CGAffineTransformScale(view.transform, 100.0, 100.0);
}
completion:nil];
}
- (void) removeWithZoomOutAnimation:(float)secs option:(UIViewAnimationOptions)option
{
[UIView animateWithDuration:secs delay:0.0 options:option
animations:^{
self.transform = CGAffineTransformScale(self.transform, 0.1, 0.1);
}
completion:^(BOOL finished) {
[self removeFromSuperview];
}];
}
// add with a fade-in effect
- (void) addSubviewWithFadeAnimation:(UIView*)view duration:(float)secs option:(UIViewAnimationOptions)option
{
view.alpha = 0.0; // make the view transparent
[self addSubview:view]; // add it
[UIView animateWithDuration:secs delay:0.0 options:option
animations:^{view.alpha = 1.0;}
completion:nil]; // animate the return to visible
}
// remove self making it "drain" from the sink!
- (void) removeWithSinkAnimation:(int)steps
{
//NSTimer *timer;
if (steps > 0 && steps < 100) // just to avoid too much steps
self.tag = steps;
else
self.tag = 50;
[NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:#selector(removeWithSinkAnimationRotateTimer:) userInfo:nil repeats:YES];
}
- (void) removeWithSinkAnimationRotateTimer:(NSTimer*) timer
{
CGAffineTransform trans = CGAffineTransformRotate(CGAffineTransformScale(self.transform, 0.9, 0.9),0.314);
self.transform = trans;
self.alpha = self.alpha * 0.98;
self.tag = self.tag - 1;
if (self.tag <= 0)
{
[timer invalidate];
[self removeFromSuperview];
}
}
#end
I hope it solves your problem. enjoy.:)