I got one problem and i have described it below.
I am using UIViewControllerContextTransitioning for custom transitions.
I have 2 view controllers, first view controller and second view controller.
Now I want to add second view controller on first view controller with an animation. I have achieved it, now the second view controller is transparent, so we can see first view controller below second view controller.
But I am not able to see first view controller, and I can see only black screen below second view controller.
-(void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext{
self.transitionContext = transitionContext;
if(self.isPresenting){
[self executePresentationAnimation:transitionContext];
}
else{
[self executeDismissalAnimation:transitionContext];
}
}
-(void)executePresentationAnimation:(id<UIViewControllerContextTransitioning>)transitionContext{
UIView* inView = [transitionContext containerView];
UIViewController* toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIViewController* fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
CGRect offScreenFrame = inView.frame;
offScreenFrame.origin.y = inView.frame.size.height;
toViewController.view.frame = offScreenFrame;
toViewController.view.backgroundColor = [UIColor clearColor];
fromViewController.view.backgroundColor = [UIColor clearColor];
inView.backgroundColor = [UIColor clearColor];
[inView insertSubview:toViewController.view aboveSubview:fromViewController.view];
// [inView addSubview:toViewController.view];
CFTimeInterval duration = self.presentationDuration;
CFTimeInterval halfDuration = duration/2;
CATransform3D t1 = [self firstTransform];
CATransform3D t2 = [self secondTransformWithView:fromViewController.view];
[UIView animateKeyframesWithDuration:halfDuration delay:0.0 options:UIViewKeyframeAnimationOptionCalculationModeLinear animations:^{
[UIView addKeyframeWithRelativeStartTime:0.0f relativeDuration:0.5f animations:^{
fromViewController.view.layer.transform = t1;
}];
[UIView addKeyframeWithRelativeStartTime:0.5f relativeDuration:0.5f animations:^{
fromViewController.view.layer.transform = t2;
}];
} completion:^(BOOL finished) {
}];
[UIView animateWithDuration:duration delay:(halfDuration - (0.3*halfDuration)) usingSpringWithDamping:0.7f initialSpringVelocity:6.0f options:UIViewAnimationOptionCurveEaseIn animations:^{
toViewController.view.frame = inView.frame;
} completion:^(BOOL finished) {
[self.transitionContext completeTransition:YES];
}];
}
When [self.transitionContext completeTransition:YES]; called, suddenly the first view controller disappears and black screen displays below second view controller.
Does any one have idea ? Thanks.
