Screen become blank after custom view transition - ios

Question

I'm learning how to implement custom view transition. I want to create a slide menu something like spotify side menu. I'm using UIViewControllerAnimatedTransitioning. The animation seems to be working but after dismissing transition, the screen become blank.
This is the code for presenting transition
#import "Transition.h"
#implementation Transition
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext{
return 1;
}
-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext{
UIViewController *to=[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIViewController *from=[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIView *containerView=[transitionContext containerView];
to.view.alpha=0.0;
[containerView addSubview:to.view];
[containerView addSubview:from.view];
[UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
from.view.frame = CGRectMake(200, 0, from.view.frame.size.width, from.view.frame.size.height);
from.view.alpha=1.0;
to.view.alpha=1.0;
} completion:^(BOOL finished) {
[transitionContext completeTransition:YES];
}];
}
#end
This is the code for dismissal transition
#import "DismissTransition.h"
#implementation DismissTransition
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext{
return 1;
}
-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContex{
UIViewController *from=[transitionContex viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *to=[transitionContex viewControllerForKey:UITransitionContextToViewControllerKey];
UIView *containerView=[transitionContex containerView];
[UIView animateWithDuration:[self transitionDuration:transitionContex] animations:^{
to.view.frame = CGRectMake(0, 0, from.view.frame.size.width, from.view.frame.size.height);
to.view.alpha=1.0;
from.view.alpha=0.0;
} completion:^(BOOL finished) {
[transitionContex completeTransition:YES];
}];
}
#end
This is where my custom transition is called
#import "ViewController.h"
#import "Transition.h"
#import "DismissTransition.h"
#import "MenuViewController.h"
#interface ViewController ()<UIViewControllerTransitioningDelegate>
#end
#implementation ViewController
- (IBAction)buttonTap:(id)sender {
UIStoryboard *mystoryboard = [UIStoryboard storyboardWithName:#"Main" bundle:nil];
MenuViewController* viewController = [mystoryboard instantiateViewControllerWithIdentifier:#"MenuVC"];
viewController.modalPresentationStyle=UIModalPresentationCustom;
viewController.transitioningDelegate=self;
[self presentViewController:viewController animated:YES completion:nil];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented
presentingController:(UIViewController *)presenting
sourceController:(UIViewController *)source{
return [[Transition alloc]init];
}
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed{
return [[DismissTransition alloc]init];
}
#end
And this is how I dismiss MenuViewController
#import "MenuViewController.h"
#interface MenuViewController ()
#end
#implementation MenuViewController
- (IBAction)doneButtonTap:(id)sender {
[self dismissViewControllerAnimated:YES completion:nil];
}
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end

Answer 1

You should add to.view to containerView in DismissTransition